[jdk17u-dev] RFR: 8280705: Parallel: Full gc mark stack draining should prefer to make work available to other threads [v3]

[Goetz Lindenmaier]

On Tue, 15 Aug 2023 17:13:48 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
>> 
>>  - Merge branch 'master' into JDK-8280705-parallel-fullgc-work
>>  - Merge branch 'master' into JDK-8280705-parallel-fullgc-work
>>  - Merge branch 'master' into JDK-8280705-parallel-fullgc-work
>>  - Backport bdda43e066b8da0ebf9a8ef2f843eabb230f0800
>
> Same with `naive-bayes`:
> 
> 
> $ build/linux-x86_64-server-release/images/jdk/bin/java -XX:+UseParallelGC -Xmx4g -Xms4g -XX:+AlwaysPreTouch -Xlog:gc -jar ../renaissance-mit-0.14.2.jar naive-bayes 2>&1 | grep "Pause Full"
> 
> # Before
> [24.500s][info][gc] GC(340) Pause Full (System.gc()) 1373M->1367M(4089M) 90.501ms
> [25.173s][info][gc] GC(353) Pause Full (System.gc()) 1373M->1367M(4090M) 92.504ms
> [25.844s][info][gc] GC(366) Pause Full (System.gc()) 1373M->1367M(4089M) 93.355ms
> [26.518s][info][gc] GC(379) Pause Full (System.gc()) 1373M->1367M(4090M) 91.851ms
> [27.215s][info][gc] GC(392) Pause Full (System.gc()) 1373M->1367M(4090M) 91.128ms
> [27.900s][info][gc] GC(405) Pause Full (System.gc()) 1373M->1367M(4090M) 90.536ms
> [28.570s][info][gc] GC(418) Pause Full (System.gc()) 1373M->1367M(4090M) 92.705ms
> [29.247s][info][gc] GC(431) Pause Full (System.gc()) 1373M->1367M(4090M) 91.838ms
> [29.926s][info][gc] GC(444) Pause Full (System.gc()) 1373M->1367M(4090M) 92.964ms
> [30.599s][info][gc] GC(457) Pause Full (System.gc()) 1373M->1367M(4089M) 91.042ms
> 
> # After
> [24.654s][info][gc] GC(338) Pause Full (System.gc()) 1373M->1367M(4090M) 105.490ms
> [25.349s][info][gc] GC(351) Pause Full (System.gc()) 1373M->1367M(4090M) 106.263ms
> [26.046s][info][gc] GC(364) Pause Full (System.gc()) 1373M->1367M(4090M) 106.324ms
> [26.748s][info][gc] GC(377) Pause Full (System.gc()) 1373M->1367M(4090M) 106.146ms
> [27.448s][info][gc] GC(390) Pause Full (System.gc()) 1373M->1367M(4090M) 108.895ms
> [28.143s][info][gc] GC(403) Pause Full (System.gc()) 1373M->1367M(4090M) 107.850ms
> [28.861s][info][gc] GC(416) Pause Full (System.gc()) 1373M->1367M(4090M) 106.542ms
> [29.550s][info][gc] GC(429) Pause Full (System.gc()) 1373M->1367M(4090M) 109.635ms
> [30.233s][info][gc] GC(442) Pause Full (System.gc()) 1373M->1367M(4090M) 107.652ms
> [30.922s][info][gc] GC(455) Pause Full (System.gc()) 1374M->1367M(4090M) 108.397ms

Hi @shipilev, 
If you don't want to integrate this please remove the jdk17u-*-request labels.
If you want to integrate it, maybe you want to merge head to rerun the tests before integrating to account for the changes that were done in the meantime.

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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/1521#issuecomment-1766481276