RFR: 8261152: Refine the compiler/vectorapi/VectorRebracket128Test.java test

[Vladimir Ivanov]

On Fri, 5 Feb 2021 04:42:30 GMT, 王超 <github.com+25214855+casparcwang at openjdk.org> wrote:

> Refine test VectorRebracket128Test.java as discussed here https://github.com/openjdk/jdk16/pull/139#discussion_r567796847
> 
> 1, Explicit trigger gc in the test
> 2, Remove redundant imports
> 3, Remove weird java options

test/hotspot/jtreg/compiler/vectorapi/VectorRebracket128Test.java line 63:

> 61:             while (true) {
> 62:                 try {
> 63:                     System.gc();

Please, give the following options a try: `-XX:ZCollectionInterval=0.01 -XX:ZFragmentationLimit=0`.
According to ZGC folks, it should force continuous GC cycles w/ ZGC.

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PR: https://git.openjdk.java.net/jdk/pull/2422