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From "Alexei Fedotov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4891) [drlvm][gc] heap exhaustion performance is five times slower than RI's one
Date Tue, 02 Oct 2007 14:16:50 GMT
[drlvm][gc] heap exhaustion performance is five times slower than RI's one
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                 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


$ 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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