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baunsgaard pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/systemds.git

commit 90bde55c800f170d142db40dd76e88856c4e70f4
Author: baunsgaard <[email protected]>
AuthorDate: Sun Mar 14 00:19:35 2021 +0100

    [MINOR] fix various tests
    
    - lib matrix DataGen test fix - to create a sparseBlock if null.
    - reduce nnzPropagation tests memory usage because sometime we have OOM
    fails of this test on GitHub
    - misc tests less debug output
    - cast to float in python tests
    - Compressed append Empty optimization
---
 src/main/java/org/apache/sysds/conf/DMLConfig.java |  2 +-
 .../hops/rewrite/RewriteCompressedReblock.java     |  2 +-
 .../runtime/compress/CompressedMatrixBlock.java    |  2 +-
 .../runtime/compress/colgroup/ColGroupEmpty.java   |  9 +++
 .../sysds/runtime/compress/lib/CLALibAppend.java   | 72 ++++++++++++++++------
 .../apache/sysds/runtime/data/SparseBlockCOO.java  |  6 +-
 .../runtime/matrix/data/LibMatrixDatagen.java      | 17 +++--
 src/main/python/tests/matrix/test_print.py         |  4 +-
 src/test/java/org/apache/sysds/test/TestUtils.java | 10 +--
 .../test/functions/misc/AssertExpressionTest.java  |  2 +
 .../functions/misc/ConditionalValidateTest.java    |  2 +
 .../test/functions/misc/DataTypeCastingTest.java   |  2 +
 .../test/functions/misc/DataTypeChangeTest.java    |  2 +
 .../test/functions/misc/ExistsVariableTest.java    |  4 +-
 .../functions/misc/FunctionInExpressionTest.java   |  4 +-
 .../test/functions/misc/FunctionInliningTest.java  |  2 +
 .../test/functions/misc/FunctionNamespaceTest.java |  4 ++
 .../test/functions/misc/FunctionNotFoundTest.java  |  2 +
 .../test/functions/misc/FunctionReturnTest.java    |  6 +-
 ...nstantFoldingScalarVariablePropagationTest.java |  2 +
 .../functions/misc/IPADeadCodeEliminationTest.java |  2 +
 .../functions/misc/IPAFunctionInliningTest.java    |  2 +
 .../functions/misc/IPALiteralReplacementTest.java  |  2 +
 .../test/functions/misc/IPANnzPropagationTest.java |  2 +
 .../functions/misc/IPAScalarRecursionTest.java     |  2 +
 .../misc/IPAScalarVariablePropagationTest.java     |  4 ++
 .../functions/misc/IPAUnknownRecursionTest.java    |  2 +
 .../test/functions/misc/ListAndStructTest.java     |  2 +
 .../test/functions/misc/ListAppendRemove.java      |  2 +
 .../test/functions/misc/LongOverflowTest.java      |  2 +
 .../functions/misc/NegativeLoopIncrementsTest.java |  4 +-
 .../test/functions/misc/NrowNcolStringTest.java    |  2 +
 .../test/functions/misc/PrintExpressionTest.java   |  2 +
 .../sysds/test/functions/misc/PrintMatrixTest.java |  2 +
 .../test/functions/misc/ReadAfterWriteTest.java    |  2 +
 .../test/functions/misc/ScalarAssignmentTest.java  |  2 +
 .../functions/misc/ZeroRowsColsMatrixTest.java     |  2 +
 .../scripts/functions/misc/IPANnzPropagation1.dml  |  2 +-
 .../scripts/functions/misc/IPANnzPropagation2.dml  |  4 +-
 39 files changed, 158 insertions(+), 42 deletions(-)

diff --git a/src/main/java/org/apache/sysds/conf/DMLConfig.java 
b/src/main/java/org/apache/sysds/conf/DMLConfig.java
index 74ddf8a..5f90fb4 100644
--- a/src/main/java/org/apache/sysds/conf/DMLConfig.java
+++ b/src/main/java/org/apache/sysds/conf/DMLConfig.java
@@ -126,7 +126,7 @@ public class DMLConfig
                _defaultVals.put(CP_PARALLEL_IO,         "true" );
                _defaultVals.put(COMPRESSED_LINALG,      
Compression.CompressConfig.FALSE.name() );
                _defaultVals.put(COMPRESSED_LOSSY,       "false" );
-               _defaultVals.put(COMPRESSED_VALID_COMPRESSIONS, 
"SDC,DDC,RLE,OLE");
+               _defaultVals.put(COMPRESSED_VALID_COMPRESSIONS, "SDC,DDC");
                _defaultVals.put(COMPRESSED_OVERLAPPING, "true" );
                _defaultVals.put(COMPRESSED_SAMPLING_RATIO, "0.01");
                _defaultVals.put(COMPRESSED_COCODE,      "COST");
diff --git 
a/src/main/java/org/apache/sysds/hops/rewrite/RewriteCompressedReblock.java 
b/src/main/java/org/apache/sysds/hops/rewrite/RewriteCompressedReblock.java
index 194a5d7..0f26fa1 100644
--- a/src/main/java/org/apache/sysds/hops/rewrite/RewriteCompressedReblock.java
+++ b/src/main/java/org/apache/sysds/hops/rewrite/RewriteCompressedReblock.java
@@ -215,7 +215,7 @@ public class RewriteCompressedReblock extends 
StatementBlockRewriteRule {
                private int numberCompressedOpsExecuted = 0;
                private int numberDecompressedOpsExecuted = 0;
                private int inefficientSupportedOpsExecuted = 0;
-               private int superEfficientSuportedOpsExecuted = 0;
+               // private int superEfficientSupportedOpsExecuted = 0;
 
                private boolean foundStart = false;
                private boolean usedInLoop = false;
diff --git 
a/src/main/java/org/apache/sysds/runtime/compress/CompressedMatrixBlock.java 
b/src/main/java/org/apache/sysds/runtime/compress/CompressedMatrixBlock.java
index 828610b..5dc44d1 100644
--- a/src/main/java/org/apache/sysds/runtime/compress/CompressedMatrixBlock.java
+++ b/src/main/java/org/apache/sysds/runtime/compress/CompressedMatrixBlock.java
@@ -1235,7 +1235,7 @@ public class CompressedMatrixBlock extends MatrixBlock {
        public MatrixBlock randOperationsInPlace(RandomMatrixGenerator rgen, 
Well1024a bigrand, long bSeed, int k) {
                throw new DMLRuntimeException("CompressedMatrixBlock: 
randOperationsInPlace not supported.");
        }
-
+       
        @Override
        public MatrixBlock seqOperationsInPlace(double from, double to, double 
incr) {
                // output should always be uncompressed
diff --git 
a/src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupEmpty.java 
b/src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupEmpty.java
index a70d250..7cda071 100644
--- 
a/src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupEmpty.java
+++ 
b/src/main/java/org/apache/sysds/runtime/compress/colgroup/ColGroupEmpty.java
@@ -38,6 +38,7 @@ public class ColGroupEmpty extends ColGroupValue {
                super();
        }
 
+
        /**
         * Constructs an Constant Colum Group, that contains only one tuple, 
with the given value.
         * 
@@ -49,6 +50,14 @@ public class ColGroupEmpty extends ColGroupValue {
                _zeros = true;
        }
 
+       public static ColGroupEmpty generate(int nCol, int nRow){
+               int[] cols = new int[nCol];
+               for(int i =0; i < nCol; i++){
+                       cols[i] =i;
+               }
+               return new ColGroupEmpty(cols,nRow);
+       }
+
        @Override
        public int[] getCounts(int[] out) {
                // nothing
diff --git 
a/src/main/java/org/apache/sysds/runtime/compress/lib/CLALibAppend.java 
b/src/main/java/org/apache/sysds/runtime/compress/lib/CLALibAppend.java
index 2ea5397..bb130b6 100644
--- a/src/main/java/org/apache/sysds/runtime/compress/lib/CLALibAppend.java
+++ b/src/main/java/org/apache/sysds/runtime/compress/lib/CLALibAppend.java
@@ -20,6 +20,7 @@
 package org.apache.sysds.runtime.compress.lib;
 
 import java.util.ArrayList;
+import java.util.List;
 
 import org.apache.commons.lang3.tuple.Pair;
 import org.apache.commons.logging.Log;
@@ -28,6 +29,7 @@ import 
org.apache.sysds.runtime.compress.CompressedMatrixBlock;
 import org.apache.sysds.runtime.compress.CompressedMatrixBlockFactory;
 import org.apache.sysds.runtime.compress.CompressionStatistics;
 import org.apache.sysds.runtime.compress.colgroup.AColGroup;
+import org.apache.sysds.runtime.compress.colgroup.ColGroupEmpty;
 import org.apache.sysds.runtime.matrix.data.MatrixBlock;
 
 public class CLALibAppend {
@@ -35,25 +37,25 @@ public class CLALibAppend {
        private static final Log LOG = 
LogFactory.getLog(CLALibAppend.class.getName());
 
        public static MatrixBlock append(MatrixBlock left, MatrixBlock right) {
-               
-               // if(left.isEmpty())
-               //      return right;
-               // else if(right.isEmpty())
-               //      return left;
+
+               if(left.isEmpty() && right instanceof CompressedMatrixBlock)
+                       return appendLeftEmpty(left, (CompressedMatrixBlock) 
right);
+               else if(right.isEmpty() && left instanceof 
CompressedMatrixBlock)
+                       return appendRightEmpty((CompressedMatrixBlock)left, 
right);
+
                final int m = left.getNumRows();
                final int n = left.getNumColumns() + right.getNumColumns();
 
-
                // try to compress both sides (if not already compressed).
-               if(!(left instanceof CompressedMatrixBlock) && m > 1000){
-                       LOG.info("Compressing left for append operation");
+               if(!(left instanceof CompressedMatrixBlock) && m > 1000) {
+                       LOG.warn("Compressing left for append operation");
                        Pair<MatrixBlock, CompressionStatistics> x = 
CompressedMatrixBlockFactory.compress(left);
                        if(x.getRight().ratio > 3.0)
                                left = x.getLeft();
-                       
+
                }
-               if(!(right instanceof CompressedMatrixBlock) && m > 1000){
-                       LOG.info("Compressing right for append operation");
+               if(!(right instanceof CompressedMatrixBlock) && m > 1000) {
+                       LOG.warn("Compressing right for append operation");
                        Pair<MatrixBlock, CompressionStatistics> x = 
CompressedMatrixBlockFactory.compress(right);
                        if(x.getRight().ratio > 3.0)
                                right = x.getLeft();
@@ -69,25 +71,57 @@ public class CLALibAppend {
                // init result matrix
                CompressedMatrixBlock ret = new CompressedMatrixBlock(m, n);
 
+               ret = appendColGroups(ret, leftC.getColGroups(), 
rightC.getColGroups(), leftC.getNumColumns());
+               return ret;
+       }
+
+       private static MatrixBlock appendRightEmpty(CompressedMatrixBlock left, 
MatrixBlock right) {
+
+               final int m = left.getNumRows();
+               final int n = left.getNumColumns() + right.getNumColumns();
+               CompressedMatrixBlock ret = new CompressedMatrixBlock(m,n);
+
+               List<AColGroup> newGroup = new ArrayList<>(1);
+               newGroup.add(ColGroupEmpty.generate(right.getNumColumns(), 
right.getNumRows()));
+               ret = appendColGroups(ret, left.getColGroups(), newGroup, 
left.getNumColumns());
+
+               return ret;
+       }
+
+       private static MatrixBlock appendLeftEmpty(MatrixBlock left, 
CompressedMatrixBlock right) {
+               final int m = left.getNumRows();
+               final int n = left.getNumColumns() + right.getNumColumns();
+               CompressedMatrixBlock ret = new CompressedMatrixBlock(m,n);
+
+               List<AColGroup> newGroup = new ArrayList<>(1);
+               newGroup.add(ColGroupEmpty.generate(left.getNumColumns(), 
left.getNumRows()));
+               ret = appendColGroups(ret, newGroup, right.getColGroups(), 
left.getNumColumns());
+
+               return ret;
+       }
+
+       private static CompressedMatrixBlock 
appendColGroups(CompressedMatrixBlock ret, List<AColGroup> left,
+               List<AColGroup> right, int leftNumCols) {
+
                // shallow copy of lhs column groups
-               ret.allocateColGroupList(new 
ArrayList<AColGroup>(leftC.getColGroups().size() + 
rightC.getColGroups().size()));
+               ret.allocateColGroupList(new ArrayList<AColGroup>(left.size() + 
right.size()));
 
-               for(AColGroup group : leftC.getColGroups()){
+               long nnz = 0;
+               for(AColGroup group : left) {
                        AColGroup tmp = group.copy();
                        ret.getColGroups().add(tmp);
+                       nnz += group.getNumberNonZeros();
                }
 
-               for(AColGroup group : rightC.getColGroups()) {
+               for(AColGroup group : right) {
                        AColGroup tmp = group.copy();
-                       tmp.shiftColIndices(left.getNumColumns());
+                       tmp.shiftColIndices(leftNumCols);
                        ret.getColGroups().add(tmp);
+                       nnz += group.getNumberNonZeros();
                }
 
-               long nnzl = (leftC.getNonZeros() <= -1 ) ? 
leftC.recomputeNonZeros() : leftC.getNonZeros() ;
-               long nnzr = (rightC.getNonZeros() <= -1 ) ? 
rightC.recomputeNonZeros() : rightC.getNonZeros() ;
-               
                // meta data maintenance
-               ret.setNonZeros(nnzl + nnzr);
+               ret.setNonZeros(nnz);
                return ret;
        }
 
diff --git a/src/main/java/org/apache/sysds/runtime/data/SparseBlockCOO.java 
b/src/main/java/org/apache/sysds/runtime/data/SparseBlockCOO.java
index aebf060..ce8e707 100644
--- a/src/main/java/org/apache/sysds/runtime/data/SparseBlockCOO.java
+++ b/src/main/java/org/apache/sysds/runtime/data/SparseBlockCOO.java
@@ -150,9 +150,9 @@ public class SparseBlockCOO extends SparseBlock
                
                //32B overhead per array, int/int/double arr in nnz 
                double size = 16 + 8;   //object + 2 int fields
-               size += MemoryEstimates.intArrayCost((int)lnnz); ; //rindexes 
array (row indexes)
-               size += MemoryEstimates.intArrayCost((int) lnnz);   ; 
//cindexes array (column indexes)
-               size += MemoryEstimates.doubleArrayCost((int) lnnz);; //values 
array (non-zero values)
+               size += MemoryEstimates.intArrayCost((int)lnnz); //rindexes 
array (row indexes)
+               size += MemoryEstimates.intArrayCost((int) lnnz); //cindexes 
array (column indexes)
+               size += MemoryEstimates.doubleArrayCost((int) lnnz); //values 
array (non-zero values)
                
                //robustness for long overflows
                return (long) Math.min(size, Long.MAX_VALUE);
diff --git 
a/src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDatagen.java 
b/src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDatagen.java
index a8fce54..2f1a51f 100644
--- a/src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDatagen.java
+++ b/src/main/java/org/apache/sysds/runtime/matrix/data/LibMatrixDatagen.java
@@ -33,6 +33,7 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.commons.math3.random.Well1024a;
 import org.apache.sysds.hops.DataGenOp;
 import org.apache.sysds.runtime.DMLRuntimeException;
+import org.apache.sysds.runtime.compress.CompressedMatrixBlock;
 import org.apache.sysds.runtime.controlprogram.parfor.util.IDSequence;
 import org.apache.sysds.runtime.data.DenseBlock;
 import org.apache.sysds.runtime.data.SparseBlock;
@@ -186,6 +187,9 @@ public class LibMatrixDatagen
                int blen = rgen._blocksize;
                double sparsity = rgen._sparsity;
                
+               if(out instanceof CompressedMatrixBlock)
+                       throw new DMLRuntimeException("Invalid to use 
compressed matrix block as output");
+
                // sanity check valid dimensions and sparsity
                checkMatrixDimensionsAndSparsity(rows, cols, sparsity);
                
@@ -258,6 +262,9 @@ public class LibMatrixDatagen
                int blen = rgen._blocksize;
                double sparsity = rgen._sparsity;
                
+               if(out instanceof CompressedMatrixBlock)
+                       throw new DMLRuntimeException("Invalid to use 
compressed matrix block as output");
+
                //sanity check valid dimensions and sparsity
                checkMatrixDimensionsAndSparsity(rows, cols, sparsity);
                
@@ -496,13 +503,15 @@ public class LibMatrixDatagen
                                // are always selected uniformly at random.
                                nnzPRNG.setSeed(seed);
                                
-                               // block-level sparsity, which may differ from 
overall sparsity in the matrix.
-                               // (e.g., border blocks may fall under skinny 
matrix turn point, in CP this would be 
-                               // irrelevant but we need to ensure consistency 
with MR)
                                boolean localSparse = 
MatrixBlock.evalSparseFormatInMemory(
                                        blockrows, blockcols, 
(long)(sparsity*blockrows*blockcols));
-                               if ( localSparse ) {
+                               if ( localSparse) {
+                                       
                                        SparseBlock c = out.sparseBlock;
+                                       if(c == null){
+                                               out.allocateSparseRowsBlock();
+                                               c = out.sparseBlock;
+                                       }
                                        // Prob [k-1 zeros before a nonzero] = 
Prob [k-1 < log(uniform)/log(1-p) < k] = p*(1-p)^(k-1), where p=sparsity
                                        double log1mp = Math.log(1-sparsity);
                                        int idx = 0;  // takes values in range 
[1, blen*blen] (both ends including)
diff --git a/src/main/python/tests/matrix/test_print.py 
b/src/main/python/tests/matrix/test_print.py
index 670ce37..4dc5a4b 100644
--- a/src/main/python/tests/matrix/test_print.py
+++ b/src/main/python/tests/matrix/test_print.py
@@ -46,11 +46,11 @@ class TestPrint(unittest.TestCase):
 
     def test_print_01(self):
         Matrix(self.sds, np.array([1])).to_string().print().compute()
-        self.assertEqual('1.000',self.sds.get_stdout()[0])
+        self.assertEqual(1,float(self.sds.get_stdout()[0]))
 
     def test_print_02(self):
         self.sds.scalar(1).print().compute()
-        self.assertEqual('1', self.sds.get_stdout()[0])
+        self.assertEqual(1,float(self.sds.get_stdout()[0]))
 
 if __name__ == "__main__":
     unittest.main(exit=False)
diff --git a/src/test/java/org/apache/sysds/test/TestUtils.java 
b/src/test/java/org/apache/sysds/test/TestUtils.java
index 6244833..48ba4ac 100644
--- a/src/test/java/org/apache/sysds/test/TestUtils.java
+++ b/src/test/java/org/apache/sysds/test/TestUtils.java
@@ -1047,10 +1047,12 @@ public class TestUtils
                        if (!compareCellValue(v1, v2, 0, ignoreNaN)) {
                                if (!compareCellValue(v1, v2, tolerance, 
ignoreNaN)) {
                                        countErrorWithinTolerance++;
-                                       if(!flag)
-                                               
System.out.println(e.getKey()+": "+v1+" <--> "+v2);
-                                       else
-                                               
System.out.println(e.getKey()+": "+v2+" <--> "+v1);
+                                       if(LOG.isDebugEnabled()){
+                                               if(!flag)
+                                                       LOG.debug(e.getKey()+": 
"+v1+" <--> "+v2);
+                                               else
+                                                       LOG.debug(e.getKey()+": 
"+v2+" <--> "+v1);
+                                       }
                                }
                        } else {
                                countIdentical++;
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/AssertExpressionTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/AssertExpressionTest.java
index 7fadbe7..1ee0e4f 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/AssertExpressionTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/AssertExpressionTest.java
@@ -58,6 +58,7 @@ public class AssertExpressionTest extends AutomatedTestBase
         */
        private void runPrintExpressionTest( String testname, boolean rewrites )
        {
+               setOutputBuffering(true);
                String TEST_NAME = testname;
                TestConfiguration config = getTestConfiguration(TEST_NAME);
                loadTestConfiguration(config);
@@ -82,5 +83,6 @@ public class AssertExpressionTest extends AutomatedTestBase
                {
                        OptimizerUtils.ALLOW_ALGEBRAIC_SIMPLIFICATION = 
oldRewriteFlag;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/ConditionalValidateTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/ConditionalValidateTest.java
index b911a4a..bec66c3 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/ConditionalValidateTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/ConditionalValidateTest.java
@@ -102,6 +102,7 @@ public class ConditionalValidateTest extends 
AutomatedTestBase
        
        private void runTest( String testName, Class<?> exceptionClass, boolean 
fileExists )
        {
+               setOutputBuffering(true);
                String TEST_NAME = testName;
 
                try
@@ -135,5 +136,6 @@ public class ConditionalValidateTest extends 
AutomatedTestBase
                catch(Exception ex) {
                        throw new RuntimeException(ex);
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/DataTypeCastingTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/DataTypeCastingTest.java
index 6df7e9c..d524f64 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/DataTypeCastingTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/DataTypeCastingTest.java
@@ -87,6 +87,7 @@ public class DataTypeCastingTest extends AutomatedTestBase
         */
        private void runTest( String testName, boolean matrixInput, Class<?> 
exceptionClass ) 
        {
+               setOutputBuffering(true);
                String TEST_NAME = testName;
                int numVals = (exceptionClass != null ? 7 : 1);
                
@@ -134,5 +135,6 @@ public class DataTypeCastingTest extends AutomatedTestBase
                {
                        throw new RuntimeException(ex);
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/DataTypeChangeTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/DataTypeChangeTest.java
index d50eb23..3b4741a 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/DataTypeChangeTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/DataTypeChangeTest.java
@@ -150,6 +150,7 @@ public class DataTypeChangeTest extends AutomatedTestBase
 
        private void runTest( String testName, Class<?> exceptionExpected ) 
        {
+               setOutputBuffering(true);
         String RI_HOME = SCRIPT_DIR + TEST_DIR;
                fullDMLScriptName = RI_HOME + testName + ".dml";
                programArgs = new String[]{};
@@ -159,6 +160,7 @@ public class DataTypeChangeTest extends AutomatedTestBase
                
                //integration test from outside SystemDS
                runTest(true, exceptionExpected != null, exceptionExpected, -1);
+               setOutputBuffering(false);
        }
        
 
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/ExistsVariableTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/ExistsVariableTest.java
index dee93cd..9d229fb 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/ExistsVariableTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/ExistsVariableTest.java
@@ -63,12 +63,13 @@ public class ExistsVariableTest extends AutomatedTestBase
        }
        
        private void runExistsTest(String testName, boolean pos) {
+               setOutputBuffering(true);
                TestConfiguration config = getTestConfiguration(testName);
                loadTestConfiguration(config);
                String HOME = SCRIPT_DIR + TEST_DIR;
                String param = pos ? "1" : "0";
                fullDMLScriptName = HOME + testName + ".dml";
-               programArgs = new String[]{"-stats", "-args", param, 
output("R") };
+               programArgs = new String[]{"-args", param, output("R") };
                
                //run script and compare output
                runTest(true, false, null, -1); 
@@ -78,5 +79,6 @@ public class ExistsVariableTest extends AutomatedTestBase
                val = (val!=null) ? val : 0;
                Assert.assertTrue("Wrong result: "+param+" vs "+val,
                        val==Double.parseDouble(param));
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionInExpressionTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionInExpressionTest.java
index 7c5cd44..6d0b260 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionInExpressionTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionInExpressionTest.java
@@ -89,12 +89,13 @@ public class FunctionInExpressionTest extends 
AutomatedTestBase
        
        private void runFunInExpressionTest( String testName )
        {
+               setOutputBuffering(true);
                TestConfiguration config = getTestConfiguration(testName);
                loadTestConfiguration(config);
                
                String HOME = SCRIPT_DIR + TEST_DIR;
                fullDMLScriptName = HOME + testName + ".dml";
-               programArgs = new String[]{"-stats", "-args", output("R") };
+               programArgs = new String[]{"-args", output("R") };
                
                fullRScriptName = HOME + testName + ".R";
                rCmd = getRCmd(expectedDir());
@@ -105,5 +106,6 @@ public class FunctionInExpressionTest extends 
AutomatedTestBase
                //compare results
                double val = readDMLMatrixFromOutputDir("R").get(new 
CellIndex(1,1));
                Assert.assertTrue("Wrong result: 7 vs "+val, 
Math.abs(val-7)<Math.pow(10, -13));
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionInliningTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionInliningTest.java
index 8861d27..b539328 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionInliningTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionInliningTest.java
@@ -85,6 +85,7 @@ public class FunctionInliningTest extends AutomatedTestBase
 
        private void runInliningTest( String testname, boolean IPA )
        {       
+               setOutputBuffering(true);
                boolean oldIPA = OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                
                try
@@ -125,6 +126,7 @@ public class FunctionInliningTest extends AutomatedTestBase
                {
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = oldIPA;
                }
+               setOutputBuffering(false);
        }
        
 }
\ No newline at end of file
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionNamespaceTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionNamespaceTest.java
index e8b016b..f3f3fe9 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionNamespaceTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionNamespaceTest.java
@@ -161,6 +161,7 @@ public class FunctionNamespaceTest extends AutomatedTestBase
        
        private void runFunctionNamespaceTest(String TEST_NAME)
        {
+               setOutputBuffering(true);
                getAndLoadTestConfiguration(TEST_NAME);
                
                fullDMLScriptName = SCRIPT_DIR + TEST_DIR + TEST_NAME + ".dml";
@@ -183,10 +184,12 @@ public class FunctionNamespaceTest extends 
AutomatedTestBase
                finally {
                        System.setErr(origStdErr);
                }
+               setOutputBuffering(false);
        }
 
        private void runFunctionNoInliningNamespaceTest(String TEST_NAME, 
boolean IPA)
        {
+               setOutputBuffering(true);
                boolean origIPA = 
OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                
                getAndLoadTestConfiguration(TEST_NAME);
@@ -229,5 +232,6 @@ public class FunctionNamespaceTest extends AutomatedTestBase
                        System.setErr(originalStdErr);
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = 
origIPA;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionNotFoundTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionNotFoundTest.java
index 4c56806..c7ed903 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionNotFoundTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionNotFoundTest.java
@@ -50,6 +50,7 @@ public class FunctionNotFoundTest extends AutomatedTestBase {
        }
 
        private void runFunctionNotFoundTest(String testName, Class<?> error) {
+               setOutputBuffering(true);
                TestConfiguration config = getTestConfiguration(testName);
                loadTestConfiguration(config);
 
@@ -58,5 +59,6 @@ public class FunctionNotFoundTest extends AutomatedTestBase {
                programArgs = new String[] {};
 
                runTest(true, true, error, -1);
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/FunctionReturnTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/FunctionReturnTest.java
index 60fc339..1dd9d62 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/FunctionReturnTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/FunctionReturnTest.java
@@ -58,6 +58,8 @@ public class FunctionReturnTest extends AutomatedTestBase
        }
 
        private void runFunctionReturnTest( String testname, boolean IPA ) {
+
+               setOutputBuffering(true);
                boolean oldIPA = OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = IPA;
                try {
@@ -66,12 +68,14 @@ public class FunctionReturnTest extends AutomatedTestBase
                        
                        String HOME = SCRIPT_DIR + TEST_DIR;
                        fullDMLScriptName = HOME + testname + ".dml";
-                       programArgs = new String[]{"-explain"};
+                       programArgs = new String[]{};
        
                        runTest(true, false, null, -1); 
                }
                finally {
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = oldIPA;
                }
+
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAConstantFoldingScalarVariablePropagationTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAConstantFoldingScalarVariablePropagationTest.java
index 74b60d5..8d2213c 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAConstantFoldingScalarVariablePropagationTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAConstantFoldingScalarVariablePropagationTest.java
@@ -94,6 +94,7 @@ public class IPAConstantFoldingScalarVariablePropagationTest 
extends AutomatedTe
         */
        private void runIPAScalarVariablePropagationTest(String testname, 
boolean IPA_SECOND_CHANCE)
        {
+               setOutputBuffering(true);
                // Save old settings
                int oldIPANumRep = OptimizerUtils.IPA_NUM_REPETITIONS;
                boolean sparkConfigOld = DMLScript.USE_LOCAL_SPARK_CONFIG;
@@ -125,5 +126,6 @@ public class 
IPAConstantFoldingScalarVariablePropagationTest extends AutomatedTe
                        DMLScript.USE_LOCAL_SPARK_CONFIG = sparkConfigOld;
                        rtplatform = platformOld;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPADeadCodeEliminationTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/IPADeadCodeEliminationTest.java
index daf034a..35a4d34 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPADeadCodeEliminationTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPADeadCodeEliminationTest.java
@@ -87,6 +87,7 @@ public class IPADeadCodeEliminationTest extends 
AutomatedTestBase
 
        private void runIPALiteralReplacementTest( String testname, boolean IPA 
)
        {
+               setOutputBuffering(true);
                boolean oldFlagIPA = 
OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                
                try {
@@ -106,5 +107,6 @@ public class IPADeadCodeEliminationTest extends 
AutomatedTestBase
                finally {
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = 
oldFlagIPA;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAFunctionInliningTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAFunctionInliningTest.java
index ca9d156..83c90ca 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAFunctionInliningTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAFunctionInliningTest.java
@@ -122,6 +122,7 @@ public class IPAFunctionInliningTest extends 
AutomatedTestBase
        
        private void runIPAFunInlineTest( String testName, boolean IPA )
        {
+               setOutputBuffering(true);
                boolean oldFlagIPA = 
OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                
                try
@@ -162,5 +163,6 @@ public class IPAFunctionInliningTest extends 
AutomatedTestBase
                finally {
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = 
oldFlagIPA;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPALiteralReplacementTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/IPALiteralReplacementTest.java
index dc832ca..1a96f52 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPALiteralReplacementTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPALiteralReplacementTest.java
@@ -80,6 +80,7 @@ public class IPALiteralReplacementTest extends 
AutomatedTestBase
         */
        private void runIPALiteralReplacementTest( String testname, boolean IPA 
)
        {       
+               setOutputBuffering(true);
                boolean oldFlagIPA = 
OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                
                try
@@ -107,5 +108,6 @@ public class IPALiteralReplacementTest extends 
AutomatedTestBase
                {
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = 
oldFlagIPA;
                }
+               setOutputBuffering(false);
        }       
 }
\ No newline at end of file
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPANnzPropagationTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/IPANnzPropagationTest.java
index a57fee2..ffbaf23 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPANnzPropagationTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPANnzPropagationTest.java
@@ -54,6 +54,7 @@ public class IPANnzPropagationTest extends AutomatedTestBase
 
        private void runIPANnzPropgationTest(String testname)
        {
+               setOutputBuffering(true);
                // Save old settings
                boolean sparkConfigOld = DMLScript.USE_LOCAL_SPARK_CONFIG;
                ExecMode platformOld = rtplatform;
@@ -79,5 +80,6 @@ public class IPANnzPropagationTest extends AutomatedTestBase
                        DMLScript.USE_LOCAL_SPARK_CONFIG = sparkConfigOld;
                        rtplatform = platformOld;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarRecursionTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarRecursionTest.java
index c89e7db..a216cb8 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarRecursionTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarRecursionTest.java
@@ -42,6 +42,7 @@ public class IPAScalarRecursionTest extends AutomatedTestBase
        @Test
        public void testScalarRecursion() 
        {
+               setOutputBuffering(true);
                String TEST_NAME = TEST_NAME1;
                
                try
@@ -59,5 +60,6 @@ public class IPAScalarRecursionTest extends AutomatedTestBase
                {
                        throw new RuntimeException(ex);
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarVariablePropagationTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarVariablePropagationTest.java
index 788e1da..533d945 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarVariablePropagationTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAScalarVariablePropagationTest.java
@@ -61,6 +61,8 @@ public class IPAScalarVariablePropagationTest extends 
AutomatedTestBase
         */
        private void runIPAScalarVariablePropagationTest( String testname, 
boolean IPA )
        {       
+
+               setOutputBuffering(true);
                boolean oldFlagIPA = 
OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                
                try
@@ -87,5 +89,7 @@ public class IPAScalarVariablePropagationTest extends 
AutomatedTestBase
                finally {
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = 
oldFlagIPA;
                }
+
+               setOutputBuffering(false);
        }       
 }
\ No newline at end of file
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAUnknownRecursionTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAUnknownRecursionTest.java
index 24a628d..4d0c180 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/IPAUnknownRecursionTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/IPAUnknownRecursionTest.java
@@ -63,6 +63,7 @@ public class IPAUnknownRecursionTest extends AutomatedTestBase
         */
        private void runIPAUnknownRecursionTest( boolean IPA )
        {       
+               setOutputBuffering(true);
                boolean oldFlagIPA = 
OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS;
                
                try
@@ -91,5 +92,6 @@ public class IPAUnknownRecursionTest extends AutomatedTestBase
                {
                        OptimizerUtils.ALLOW_INTER_PROCEDURAL_ANALYSIS = 
oldFlagIPA;
                }
+               setOutputBuffering(false);
        }       
 }
\ No newline at end of file
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/ListAndStructTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/ListAndStructTest.java
index 4f7c31a..03598f3 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/ListAndStructTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/ListAndStructTest.java
@@ -163,6 +163,7 @@ public class ListAndStructTest extends AutomatedTestBase
        
        private void runListStructTest(String testname, boolean rewrites)
        {
+               setOutputBuffering(true);
                boolean oldFlag = OptimizerUtils.ALLOW_ALGEBRAIC_SIMPLIFICATION;
                
                try {
@@ -193,5 +194,6 @@ public class ListAndStructTest extends AutomatedTestBase
                finally {
                        OptimizerUtils.ALLOW_ALGEBRAIC_SIMPLIFICATION = oldFlag;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/ListAppendRemove.java 
b/src/test/java/org/apache/sysds/test/functions/misc/ListAppendRemove.java
index 946ef67..aa83b4f 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/ListAppendRemove.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/ListAppendRemove.java
@@ -96,6 +96,7 @@ public class ListAppendRemove extends AutomatedTestBase
        
        private void runListAppendRemove(String testname, ExecType type, 
boolean rewrites, boolean conditional)
        {
+               setOutputBuffering(true);
                Types.ExecMode platformOld = setExecMode(type);
                boolean rewriteOld = 
OptimizerUtils.ALLOW_ALGEBRAIC_SIMPLIFICATION;
                
@@ -132,5 +133,6 @@ public class ListAppendRemove extends AutomatedTestBase
                        rtplatform = platformOld;
                        OptimizerUtils.ALLOW_ALGEBRAIC_SIMPLIFICATION = 
rewriteOld;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/LongOverflowTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/LongOverflowTest.java
index 5423f98..e16cc3d 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/LongOverflowTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/LongOverflowTest.java
@@ -92,6 +92,7 @@ public class LongOverflowTest extends AutomatedTestBase
         */
        private void runOverflowTest( String testscript, boolean error ) 
        {
+               setOutputBuffering(true);
                String TEST_NAME = testscript;
                
                try
@@ -113,5 +114,6 @@ public class LongOverflowTest extends AutomatedTestBase
                {
                        throw new RuntimeException(ex);
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/NegativeLoopIncrementsTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/NegativeLoopIncrementsTest.java
index 7ec6db2..4ab4063 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/NegativeLoopIncrementsTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/NegativeLoopIncrementsTest.java
@@ -21,12 +21,12 @@ package org.apache.sysds.test.functions.misc;
 
 import java.util.HashMap;
 
-import org.junit.Test;
 import org.apache.sysds.runtime.matrix.data.MatrixValue.CellIndex;
 import org.apache.sysds.runtime.meta.MatrixCharacteristics;
 import org.apache.sysds.test.AutomatedTestBase;
 import org.apache.sysds.test.TestConfiguration;
 import org.apache.sysds.test.TestUtils;
+import org.junit.Test;
 
 /**
  * 
@@ -91,6 +91,7 @@ public class NegativeLoopIncrementsTest extends 
AutomatedTestBase
        
        private void runNegativeLoopIncrementsTest( String testname, boolean 
vect, boolean multiStep )
        {
+               setOutputBuffering(true);
                String TEST_NAME = testname;
                TestConfiguration config = getTestConfiguration(TEST_NAME);
                loadTestConfiguration(config);
@@ -118,5 +119,6 @@ public class NegativeLoopIncrementsTest extends 
AutomatedTestBase
                        
                //check meta data
                checkDMLMetaDataFile("R", new MatrixCharacteristics(1,1,1,1));
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/NrowNcolStringTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/NrowNcolStringTest.java
index 4a5c503..cd0865e 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/NrowNcolStringTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/NrowNcolStringTest.java
@@ -69,6 +69,7 @@ public class NrowNcolStringTest extends AutomatedTestBase
         */
        private void runNxxStringTest( String testName ) 
        {
+               setOutputBuffering(true);
                String TEST_NAME = testName;
                
                try
@@ -86,5 +87,6 @@ public class NrowNcolStringTest extends AutomatedTestBase
                {
                        throw new RuntimeException(ex);
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/PrintExpressionTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/PrintExpressionTest.java
index b05e5dd..a4ab57c 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/PrintExpressionTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/PrintExpressionTest.java
@@ -70,6 +70,7 @@ public class PrintExpressionTest extends AutomatedTestBase
         */
        private void runPrintExpressionTest( String testname, boolean rewrites )
        {
+               setOutputBuffering(true);
                String TEST_NAME = testname;
                TestConfiguration config = getTestConfiguration(TEST_NAME);
                loadTestConfiguration(config);
@@ -94,5 +95,6 @@ public class PrintExpressionTest extends AutomatedTestBase
                {
                        OptimizerUtils.ALLOW_ALGEBRAIC_SIMPLIFICATION = 
oldRewriteFlag;
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/PrintMatrixTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/PrintMatrixTest.java
index 9b38e37..a9e3038 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/PrintMatrixTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/PrintMatrixTest.java
@@ -45,6 +45,7 @@ public class PrintMatrixTest extends AutomatedTestBase
        
        private void runTest( String testName, boolean exceptionExpected ) 
        {
+               setOutputBuffering(true);
                TestConfiguration config = getTestConfiguration(TEST_NAME1);
                loadTestConfiguration(config);
                
@@ -54,5 +55,6 @@ public class PrintMatrixTest extends AutomatedTestBase
                
                //run tests
                runTest(true, exceptionExpected, DMLException.class, -1);
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/ReadAfterWriteTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/ReadAfterWriteTest.java
index fdf2bbc..1b2f609 100644
--- a/src/test/java/org/apache/sysds/test/functions/misc/ReadAfterWriteTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/misc/ReadAfterWriteTest.java
@@ -105,6 +105,7 @@ public class ReadAfterWriteTest extends AutomatedTestBase
         */
        private void runReadAfterWriteTest( String testName, boolean positive ) 
        {
+               setOutputBuffering(true);
                String TEST_NAME = testName;
                
                try
@@ -134,5 +135,6 @@ public class ReadAfterWriteTest extends AutomatedTestBase
                //cleanup
                TestUtils.clearDirectory(outputDir());
                }
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/ScalarAssignmentTest.java 
b/src/test/java/org/apache/sysds/test/functions/misc/ScalarAssignmentTest.java
index 95b93cf..b118bd8 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/ScalarAssignmentTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/ScalarAssignmentTest.java
@@ -156,6 +156,7 @@ public class ScalarAssignmentTest extends AutomatedTestBase
         */
        public void runScalarAssignmentTest( ControlFlowConstruct cfc, 
ValueType vt ) 
        {
+               setOutputBuffering(true);
                String TEST_NAME = null;
                switch( cfc )
                {
@@ -188,5 +189,6 @@ public class ScalarAssignmentTest extends AutomatedTestBase
         boolean exceptionExpected = (cfc==ControlFlowConstruct.PARFOR)? true : 
false; //dependency analysis
         int expectedNumberOfJobs = -1;
                runTest(true, exceptionExpected, LanguageException.class, 
expectedNumberOfJobs);
+               setOutputBuffering(false);
        }
 }
diff --git 
a/src/test/java/org/apache/sysds/test/functions/misc/ZeroRowsColsMatrixTest.java
 
b/src/test/java/org/apache/sysds/test/functions/misc/ZeroRowsColsMatrixTest.java
index a5bbd98..fb22b62 100644
--- 
a/src/test/java/org/apache/sysds/test/functions/misc/ZeroRowsColsMatrixTest.java
+++ 
b/src/test/java/org/apache/sysds/test/functions/misc/ZeroRowsColsMatrixTest.java
@@ -160,6 +160,7 @@ public class ZeroRowsColsMatrixTest extends 
AutomatedTestBase
        
        private void runEmptyMatrixTest( String testname, boolean rewrites, 
boolean emptyRet, ExecType et )
        {
+               setOutputBuffering(true);
                ExecMode platformOld = rtplatform;
                switch( et ){
                        case SPARK: rtplatform = ExecMode.SPARK; break;
@@ -205,5 +206,6 @@ public class ZeroRowsColsMatrixTest extends 
AutomatedTestBase
                        rtplatform = platformOld;
                        DMLScript.USE_LOCAL_SPARK_CONFIG = sparkConfigOld;
                }
+               setOutputBuffering(false);
        }
 }
diff --git a/src/test/scripts/functions/misc/IPANnzPropagation1.dml 
b/src/test/scripts/functions/misc/IPANnzPropagation1.dml
index 711302a..3884c08 100644
--- a/src/test/scripts/functions/misc/IPANnzPropagation1.dml
+++ b/src/test/scripts/functions/misc/IPANnzPropagation1.dml
@@ -24,7 +24,7 @@ foo = function(matrix[double] X) return (double sum) {
     sum = sum(X);
 }
 
-X = rand(rows=1000, cols=1000000000, sparsity=1e-6)
+X = rand(rows=1000, cols=100000000, sparsity=1e-6)
 s1 = foo(X);
 s2 = foo(X);
 print(s1+" "+s2);
diff --git a/src/test/scripts/functions/misc/IPANnzPropagation2.dml 
b/src/test/scripts/functions/misc/IPANnzPropagation2.dml
index de0a1df..fc4b213 100644
--- a/src/test/scripts/functions/misc/IPANnzPropagation2.dml
+++ b/src/test/scripts/functions/misc/IPANnzPropagation2.dml
@@ -24,8 +24,8 @@ foo = function(matrix[double] X) return (double sum) {
     sum = sum(X);
 }
 
-X = rand(rows=1000, cols=1000000000, sparsity=1e-6)
+X = rand(rows=1000, cols=100000000, sparsity=1e-6)
 s1 = foo(X);
-X = rand(rows=1000, cols=1000000000, sparsity=1e-7)
+X = rand(rows=1000, cols=100000000, sparsity=1e-7)
 s2 = foo(X);
 print(s1+" "+s2);

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