8299970: Speed up compiler/arraycopy/TestArrayCopyConjoint.java #12475

eme64 · 2023-02-08T14:09:10Z

I lowered the iteration count from 1000_000 (million) down to 30_000 (30k). I also removed a try-catch statement that seems to serve no purpose, but may actually prevent us from detecting failures of the test.

Per @run statement, I got the runtime down from about 4-4.5 sec to 1-1.3 sec (3-4x speedup).

Details
I ran the test with -XX:+PrintCompilation -XX:+PrintInlining -XX:-TieredCompilation -XX:CICompilerCount=1 -Xbatch, and then analyzed the output with this cat txt.txt | sed -n -e "s/.*java.lang.System::$\w*$.*intrinsic.*/\1/p" | sort | uniq -c, which gives me the count for the arraycopy intrinsification. For 1000_000 and 30_000 iterations I got 336 intrinisifications, so I am not losing any. I also tried to lower the iterations further down to 10_000, but that did only marginally lower the runtime, to 1 sec, but with much less intrinsifications, only 144. So I decided to stay at 30k.

If this fix does not turn out to be sufficient, we can try an IR test, and trigger compilation of the test methods after a much smaller iteration count for warmup (after all we want to make sure intrinsification happens), and then verify that the intrinsic is in the IR.

Update
I applied the same changes to compiler/arraycopy/TestArrayCopyDisjoint.java, verified that no intrinsification was lost. Marginal speedup from 1 sec down to 0.7 sec per run statement.

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Issue

JDK-8299970: Speed up compiler/arraycopy/TestArrayCopyConjoint.java

Reviewers

Christian Hagedorn (@chhagedorn - Reviewer) ⚠️ Review applies to 48cbd4c2
Vladimir Kozlov (@vnkozlov - Reviewer)
Tobias Hartmann (@TobiHartmann - Reviewer)

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bridgekeeper · 2023-02-08T14:10:02Z

👋 Welcome back epeter! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

openjdk · 2023-02-08T14:12:01Z

@eme64 The following label will be automatically applied to this pull request:

hotspot-compiler

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

mlbridge · 2023-02-08T14:52:40Z

Webrevs

01: Full - Incremental (1ef3860f)
00: Full (48cbd4c2)

chhagedorn

That looks reasonable.

openjdk · 2023-02-08T16:22:10Z

@eme64 This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8299970: Speed up compiler/arraycopy/TestArrayCopyConjoint.java

Reviewed-by: chagedorn, kvn, thartmann

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 60 new commits pushed to the master branch:

d1c87a0: 8302203: IR framework should detect non-compilable test methods early
1fec6b5: 8301852: RISC-V: Optimize class atomic when order is memory_order_relaxed
7c233bc: 8302114: RISC-V: Several foreign jtreg tests fail with debug build after JDK-8301818
8049e59: 8301833: Add wide-ranging tests for FDLIBM porting
6a44120: 8301269: Update Commons BCEL to Version 6.7.0
6f9f2b5: 8301737: java/rmi/server/UnicastRemoteObject/serialFilter/FilterUROTest.java fail with -Xcomp
1ef9f65: 8302172: [JVMCI] HotSpotResolvedJavaMethodImpl.canBeInlined must respect ForceInline
74b167b: 8301819: Enable continuations code by default
919a6da: 8301202: Port fdlibm log to Java
98e98e9: 8296322: javac: use methods to manage parser mode flags
... and 50 more: https://git.openjdk.org/jdk/compare/3db352d003c5996a5f86f0f465adf86326f7e1fe...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

vnkozlov · 2023-02-08T19:38:56Z

test/hotspot/jtreg/compiler/arraycopy/TestArrayCopyConjoint.java

-      } catch (Exception e) {
-        System.out.println(e.getMessage());


try/catch is there because arraycopy may throw exception due to some mess up in code generation and we want call stack and information about that to debug the issue.

But with that try/catch, no exception will be thrown and therefore the test would pass, right? And the exception would contain a stack trace, no need to catch it and print its contents.

You are right. In this case, please also update TestArrayCopyDisjoint.java test.
It could be "copy/paste" issue when these tests were created based on other existing tests.
May be in separate RFE we should review tests which use catch and may hide a failure.

Thanks for the idea, I applied it to TestArrayCopyDisjoint.java, and updated the description above.

Filed follow-up RFE
https://bugs.openjdk.org/browse/JDK-8302135

vnkozlov

Looks good.

TobiHartmann

Looks good to me too.

eme64 · 2023-02-13T08:12:21Z

Thanks @TobiHartmann @vnkozlov @chhagedorn for the reviews!
/integrate

openjdk · 2023-02-13T08:13:23Z

Going to push as commit 5d39d14.
Since your change was applied there have been 60 commits pushed to the master branch:

d1c87a0: 8302203: IR framework should detect non-compilable test methods early
1fec6b5: 8301852: RISC-V: Optimize class atomic when order is memory_order_relaxed
7c233bc: 8302114: RISC-V: Several foreign jtreg tests fail with debug build after JDK-8301818
8049e59: 8301833: Add wide-ranging tests for FDLIBM porting
6a44120: 8301269: Update Commons BCEL to Version 6.7.0
6f9f2b5: 8301737: java/rmi/server/UnicastRemoteObject/serialFilter/FilterUROTest.java fail with -Xcomp
1ef9f65: 8302172: [JVMCI] HotSpotResolvedJavaMethodImpl.canBeInlined must respect ForceInline
74b167b: 8301819: Enable continuations code by default
919a6da: 8301202: Port fdlibm log to Java
98e98e9: 8296322: javac: use methods to manage parser mode flags
... and 50 more: https://git.openjdk.org/jdk/compare/3db352d003c5996a5f86f0f465adf86326f7e1fe...master

Your commit was automatically rebased without conflicts.

openjdk · 2023-02-13T08:13:38Z

@eme64 Pushed as commit 5d39d14.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

8299970: Speed up compiler/arraycopy/TestArrayCopyConjoint.java

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openjdk bot added the hotspot-compiler hotspot-compiler-dev@openjdk.org label Feb 8, 2023

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48cbd4c

eme64 marked this pull request as ready for review February 8, 2023 14:47

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vnkozlov reviewed Feb 8, 2023

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did same with TestArrayCopyDisjoint.java

1ef3860

eme64 requested review from TobiHartmann and vnkozlov and removed request for TobiHartmann and vnkozlov February 9, 2023 11:59

vnkozlov approved these changes Feb 10, 2023

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8299970: Speed up compiler/arraycopy/TestArrayCopyConjoint.java #12475

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8299970: Speed up compiler/arraycopy/TestArrayCopyConjoint.java #12475

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