[jdk18] RFR: 8279597: [TESTBUG] ReturnBlobToWrongHeapTest.java fails with -XX:TieredStopAtLevel=1 on machines with many cores

[Hao Sun]

On Wed, 12 Jan 2022 05:16:26 GMT, Hao Sun <haosun at openjdk.org> wrote:

> > You can also set small value with `-XX:CICompilerCount=n' for this test. Increasing CodeCachecsize to 64M may help your case but we can have machines with core count even larger.
> 
> Yes. Agree. I think your solution would be better. Will test more and update soon. Thanks.

@vnkozlov I'm afraid it doesn't work either. 

If we set CICompilerCount to a small value, e.g., 2, the test case
1) passed on server/client builds as expected
2) but **failed** on non-compiler JVM build, e.g., zero, with the following error msg:  `CICompilerCount (2) cannot be greater than 0 because there are no compilers`

Because there are constraints for the valid values of CICompilerCount. See https://github.com/openjdk/jdk18/blob/master/src/hotspot/share/runtime/flags/jvmFlagConstraintsCompiler.cpp#L54

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PR: https://git.openjdk.java.net/jdk18/pull/93