RFR (S): 8148563: compiler/compilercontrol/jcmd/StressAddMultiThreadedTest.java timesout

[Pavel Punegov]

Hi,

please review the fix for a test bug.

Issue: 
1. Test timeouts because it executes a lot of jcmd processes. Number of threads is calculated as number of processors (cores) * 10, that led to an enormous number of jcmds executed on hosts with lots of CPUs/cores. 
2. Test also spends a lot of time to generate 5 huge directive files, that were tried to be added on to the directives stack. Directive stack has a limit (default 50, controlled by  CompilerDirectivesLimit).

Fix: 
1. Calculate number of threads as a log of the number of CPUs/cores * 10.
2. Generate only one file that is less than specified CompilerDirectivesLimit. 
3. Add different commands to execute (add, clear, remove and print) and generate them on demand.

webrev: http://cr.openjdk.java.net/~ppunegov/8148563/webrev.00/ <http://cr.openjdk.java.net/~ppunegov/8148563/webrev.00/>
bug: https://bugs.openjdk.java.net/browse/JDK-8148563 <https://bugs.openjdk.java.net/browse/JDK-8148563>

— Pavel.

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