This is an enquiry email via http://x10-lang.org/ from:
Ivan Kulagin <[email protected]>
Hello!
In paper "Communication Optimizations for Distributed-Memory X10 Programs"
(Rajkishore Barik, Jisheng Zhao, David Grove, Igor Peshansky, Zoran Budimlic,
and Vivek Sarkar, IEEE IPDS-2011) an approach "Local Optimization with Loop
Distribution" is proposed (Figure 6: Communication optimization rules: Scalar
Replacement, Local Optimization, Synchronization Elimination, Place-level
Strip-mining, and Parallel reduction).
-----------------------------------------
3. Local Optimization with Loop Distribution:
val dist:Dist = ...;
A = DistArray.make[T](dist);
for (i in dist)
async(A.dist(i)) {
... = A(i);
}
--------------------------------------
I wrote a simple test (as in above):
public class Hello {
public static def main(Array[String]) {
val dist:Dist = Dist.makeBlock(1..1000);
val dist_arr:DistArray[int];
dist_arr = DistArray.make[int](dist, 6);
for (i:Point in dist) {
at (dist_arr.dist(i)) {
async {
val a = dist_arr(i);
Console.OUT.println("str = " + a);
}
}
}
}
}
On my machine a has X10 2.3.1 ang GNU/Linux Fedora 19 x86_64.
I compiled test program with next options:
$ x10c++ -v -OPTIMIZE_COMMUNICATIONS=false Hello.x10
$ x10c++ -v -OPTIMIZE_COMMUNICATIONS=true Hello.x10
When i compare auto-generated c++ files, i see that they are absolutely
identical.
Could you answer to me,
1) Should the auto-generated backend C++ files with enabled
OPTIMIZE_COMMUNICATIONS and without OPTIMIZE_COMMUNICATIONS a differents?
2) Why my test program is insensitive to OPTIMIZE_COMMUNICATIONS?
3) How can i check, that my test program is optimized?
When I perform compilation process in debugger (with
-OPTIMIZE_COMMUNICATIONS=true), i see how reached
visitAsync(Async a) // in
x10.compiler/src/x10/visit/CommunicationOptimizer.java
visitAt(AtStmt at) // in
x10.compiler/src/x10/visit/CommunicationOptimizer.java
Thanks!
Kind regards,
Kulagin Ivan.
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