RFR: 8287384: Speed up jdk.test.lib.util.ForceGC

[Mandy Chung]

On Tue, 31 May 2022 13:26:17 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Hi,
>> 
>> May I have this test update reviewed?
>> 
>> The ForceGC could be enhanced by using smaller wait/sleep time, and shared cleaner.
>> 
>> Thanks,
>> Xuelei
>
> test/lib/jdk/test/lib/util/ForceGC.java line 50:
> 
>> 48:             for (int i = 0; i < 100; i++) {
>> 49:                 System.gc();
>> 50:                 System.out.println("doIt() iter: " + iter + ", gc " + i);
> 
> Maybe the trace should be printed only if `(i % 10 == 0) && (iter % 100 == 0)` to avoid having too many traces in the log?

This log was added to help debugging some past issues.  With this change, the volume of this trace would not be that helpful.   I think we can remove this log at this time.

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PR: https://git.openjdk.java.net/jdk/pull/8907