[9] RFR(XXS): 8036091: compiler/membars/DekkerTest.java fails with -XX:CICompilerCount=1

[Albert]

Also, there is noting that conceptually prevent having a shared 
compilation queue between C1 and C2,
which would make -XX:CICompilerCount=1 make work also for TieredCompilation.

Best,
Albert

On 03/03/2014 11:38 AM, Albert wrote:
> Hi Aleksey,
>
> that is not what the description of the flag says:
>
>   product(intx, CICompilerCount, CI_COMPILER_COUNT,
>           "Number of compiler threads to run")
>
> Best,
> Albert
>
>
> On 03/03/2014 11:36 AM, Aleksey Shipilev wrote:
>> On 03/03/2014 02:28 PM, Albert wrote:
>>> Silently using 2 instead of 1 compiler thread when tiered is enabled
>>> and -XX:CICompilerCount=1 was the default behavior before
>>> JDK-8034775. I worked on JDK-8034775 and back than it occurred to me
>>> that it is strange that the JVM silently 'overrules' an explicit
>>> command given by the user (namely that he/she wants to use only 1
>>> compiler thread).
>> I don't find it strange if you follow the notion of two compilers in
>> TieredCompilation. CICompilerCount=1 means "one thread per compiler",
>> which given two compilers means two threads. If you really want a single
>> thread in the compiler thread pool, then you should disable one of the
>> compilers.
>>
>> -Aleksey.
>