Author: sebb
Date: Mon Sep 12 13:20:57 2011
New Revision: 1169736
URL: http://svn.apache.org/viewvc?rev=1169736&view=rev
Log:
Use reflection to change the compute setting.
This allows the code to compile even though the field is private.
Added:
commons/proper/math/trunk/src/test/java/org/apache/commons/math/util/FastMathLoadCheck.java
(with props)
Added:
commons/proper/math/trunk/src/test/java/org/apache/commons/math/util/FastMathLoadCheck.java
URL:
http://svn.apache.org/viewvc/commons/proper/math/trunk/src/test/java/org/apache/commons/math/util/FastMathLoadCheck.java?rev=1169736&view=auto
==============================================================================
---
commons/proper/math/trunk/src/test/java/org/apache/commons/math/util/FastMathLoadCheck.java
(added)
+++
commons/proper/math/trunk/src/test/java/org/apache/commons/math/util/FastMathLoadCheck.java
Mon Sep 12 13:20:57 2011
@@ -0,0 +1,65 @@
+package org.apache.commons.math.util;
+
+import java.lang.reflect.Field;
+
+/*
+ * FastMath load test - requires that FastMath.USE_PRECOMPUTED_TABLES be set
to non-final.
+ *
+Sample output from:
+java -cp target/classes;target/test-classes
org.apache.commons.math.util.FastMathLoadCheck false false
+java -cp target/classes;target/test-classes
org.apache.commons.math.util.FastMathLoadCheck false true
+java -cp target/classes;target/test-classes
org.apache.commons.math.util.FastMathLoadCheck true false
+java -cp target/classes;target/test-classes
org.apache.commons.math.util.FastMathLoadCheck true true
+
+Using exp(100); compute=false
+new 12155456 9219 5308 5029 5587 5308
5029 5029 5029 5308
+Using exp(100); compute=true
+new 34929579 9499 5308 5308 5029 5029
5029 5308 5028 5029
+Using max(0,0); compute=false
+new 5029 3632 3073 3073 3073 3073
3073 3073 3073 3073
+Using max(0,0); compute=true
+new 5028 3911 3073 3073 3073 3073
3073 3073 3073 3073
+
+ */
+public class FastMathLoadCheck {
+
+ private static int LOOPS = 10;
+ private static boolean MAX = false;
+ private static boolean compute = false;
+
+ public static void main(String[] args) throws Exception {
+ if (args.length>0) MAX = Boolean.valueOf(args[0]);
+ if (args.length>1) compute = Boolean.valueOf(args[1]);
+ if (args.length>2) LOOPS = Integer.valueOf(args[2]);
+ p("Using "+ (MAX ? "max(0,0)" : "exp(100)") + "; compute=" +
compute+"\n");
+ Field usePrecompute =
FastMath.class.getDeclaredField("USE_PRECOMPUTED_TABLES");
+ usePrecompute.setAccessible(true);
+ if (usePrecompute.getBoolean(null) != compute) {
+ usePrecompute.setBoolean(null, compute);
+ }
+ usePrecompute.setAccessible(false);
+ test();
+ }
+ private static void test(){
+ p("new");
+ for(int i=0; i< LOOPS; i++){
+ p(" ");
+ long t1 = System.nanoTime();
+ if (MAX) {
+ FastMath.max(0,0);
+ } else {
+ FastMath.exp(100);
+ }
+ long t2 = System.nanoTime();
+ p("%10d",t2-t1);
+ }
+ p("\n");
+ }
+
+ private static void p(String format, Object p){
+ System.out.printf(format, p);
+ }
+ private static void p(Object p){
+ System.out.print(p);
+ }
+}
Propchange:
commons/proper/math/trunk/src/test/java/org/apache/commons/math/util/FastMathLoadCheck.java
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svn:eol-style = native
Propchange:
commons/proper/math/trunk/src/test/java/org/apache/commons/math/util/FastMathLoadCheck.java
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svn:keywords = Author Date Id Revision
