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From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-3907) [drlvm][gc_gen] noticeable perf degradation on drlvm tests
Date Fri, 18 May 2007 09:14:16 GMT
[drlvm][gc_gen] noticeable perf degradation on drlvm tests
----------------------------------------------------------

                 Key: HARMONY-3907
                 URL: https://issues.apache.org/jira/browse/HARMONY-3907
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Alexey Varlamov


This is a placeholder for tracking general problem:
I checked my perceived changes in pre-commit testing time after
Harmony switched to gcv5, comparing with old gc_cc on the following
test:

> sh build.sh -DBUILD_CFG=<cfg>  -Dtest.mode=jet test -Dtest.vmargs="-XX:vm.dlls=<gc>"
Some smoke tests (outofmemory.*, perf.SeveralThreads, etc)
intermittently fail/hang on gc_gen, so I've run each configuration 2-3
times. All machines are multicore (>= 2 CPUs) server boxes.
Ant-reported build time records are listed below:

avg time in sec, gc_cc / gc_gen
--------------------------------------------
Win32 release:    340 / 520
Win32 debug:      620 / 1400
Linux32 release:  300 /  1200
Linux32 debug:    440 / 1000
Linux64 debug:    550 / 1300

Indeed the time for testing is increased at least twice with gc_gen!

The gc_gen timing is probably somewhat better since HARMONY-3875 commit, but still noticeably
worse.
The perceived degradation is most evident in stressing smoke tests like perf.* and outofmemory.*

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