[jira] Closed: (HARMONY-4891) [drlvm][gc] heap exhaustion performance is five times slower than RI's one

["Alexei Fedotov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-4891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexei Fedotov closed HARMONY-4891.
-----------------------------------

    Resolution: Incomplete

The default DRLVM heap size is 256M because of preferrable workloads. GC tests should be fixed to mention heap setting. The issue with debug build is to be followed up by Ligang.

> [drlvm][gc] heap exhaustion performance is five times slower than RI's one
> --------------------------------------------------------------------------
>
>                 Key: HARMONY-4891
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4891
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>         Environment: Windows, ia32
>            Reporter: Alexei Fedotov
>            Assignee: Xiao-Feng Li
>         Attachments: AbstractTest.java, FreeMem.java, GcTest.java, p-unit-0.12.jar, p-unit-extension-0.12.jar
>
>
> $ time win_ia32_msvc_release/deploy/jdk/jre/bin/java -cp bin/classes org.apache.harmony.test.stress.gc.share.GcTest
> [concurrent] Starting org.apache.harmony.test.stress.gc.share.GcTest
> [debug] total = 268435456, used = 2165188, ratio = 13, sizes = 1 - 2097152
> test() - [123709.342995ms,97.95109033584595%]
> total: 1, failures:0 (GREEN) - 123770.125835ms
> real    2m9.328s
> user    0m0.015s
> sys     0m0.000s
> $ time java -cp bin/classes org.apache.harmony.test.stress.gc.share.GcTest
> [concurrent] Starting org.apache.harmony.test.stress.gc.share.GcTest
> [debug] total = 66650112, used = 142120, ratio = 13, sizes = 1 - 2097152
> test() - [47643.880758ms,92.48719041912487%]
> total: 1, failures:0 (GREEN) - 47670.789275ms
> real    0m47.953s
> user    0m0.015s
> sys     0m0.000s
> The test itself runs exactly 30sec, and most of the time is taken by single-threaded heap exhaustions to estimate the maximum size available for allocation.
> 1. It would be great to get within 70% of RI performance.
> 2. It would be great if one tunes debug build performance which is currently x40 times slower. The debug build is used for regular stress test runs and this would help to save some time.

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