RFR: 8248314: Parallel: Parallelize parallel full gc Adjust Roots phase

[Ivan Walulya]

On Tue, 2 Mar 2021 12:42:45 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Testing using specjvm2008: the worse cases goes from ~19ms to ~7ms.
> 
> before
> [0.482s][info][gc,phases] GC(1) Adjust Roots 1.304ms
> [0.489s][info][gc,phases] GC(3) Adjust Roots 0.474ms
> [182.277s][info][gc,phases] GC(160) Adjust Roots 2.740ms
> [214.946s][info][gc,phases] GC(222) Adjust Roots 1.709ms
> [300.323s][info][gc,phases] GC(1035) Adjust Roots 2.141ms
> [349.820s][info][gc,phases] GC(1408) Adjust Roots 2.197ms
> [412.236s][info][gc,phases] GC(1715) Adjust Roots 5.117ms
> [422.092s][info][gc,phases] GC(1721) Adjust Roots 5.606ms
> [424.787s][info][gc,phases] GC(1725) Adjust Roots 12.448ms
> [660.648s][info][gc,phases] GC(1870) Adjust Roots 19.632ms
> [778.819s][info][gc,phases] GC(1872) Adjust Roots 8.234ms
> [1667.836s][info][gc,phases] GC(1971) Adjust Roots 5.042ms
> 
> after
> [0.520s][info][gc,phases] GC(1) Adjust Roots 3.996ms
> [0.525s][info][gc,phases] GC(3) Adjust Roots 0.437ms
> [211.693s][info][gc,phases] GC(178) Adjust Roots 2.682ms
> [274.137s][info][gc,phases] GC(823) Adjust Roots 1.751ms
> [315.286s][info][gc,phases] GC(1435) Adjust Roots 2.213ms
> [409.044s][info][gc,phases] GC(1986) Adjust Roots 3.261ms
> [419.851s][info][gc,phases] GC(1992) Adjust Roots 4.337ms
> [423.395s][info][gc,phases] GC(1996) Adjust Roots 4.967ms
> [637.759s][info][gc,phases] GC(2151) Adjust Roots 7.613ms
> [734.576s][info][gc,phases] GC(2153) Adjust Roots 5.029ms
> [929.933s][info][gc,phases] GC(2155) Adjust Roots 4.284ms
> [1666.213s][info][gc,phases] GC(2312) Adjust Roots 4.272ms

Marked as reviewed by iwalulya (Committer).

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PR: https://git.openjdk.java.net/jdk/pull/2794