JShell uses 100% of one core all the time (JDK 15 Build 27)

[Robert Field]

Make that jps/jstack

-R

On 2020-06-15 15:12, Robert Field wrote:
> Thanks for the report.
>
> What, if anything, is the Java stack for this thread (jps)?
>
> -Robert
>
>
> On 2020-06-15 14:41, Aaron Scott-Boddendijk wrote:
>>   System:
>> * Windows 10
>> * Powershell
>>
>> When I start JShell, without executing anything, a CPU core is always at
>> 100% (a single thread though I haven't identified what it's doing).
>>
>> The thread stack is as follows (with only the last two items sometimes
>> change - but I don't know the internals of the JVM to know if this 
>> useful
>> or significant):
>>
>> ntoskrnl.exe!KeSynchronizeExecution+0x5b46
>> ntoskrnl.exe!KeWaitForSingleObject+0x1c2d
>> ntoskrnl.exe!KeWaitForSingleObject+0xab4
>> ntoskrnl.exe!KeWaitForSingleObject+0x255
>> ntoskrnl.exe!RtlClearBitsEx+0x15a7
>> ntoskrnl.exe!KeWaitForSingleObject+0x3828
>> ntoskrnl.exe!KeSynchronizeExecution+0x3120
>> jvm.dll!c2v_notifyCompilerInliningEvent+0x201797
>>
>> The JDK 14 version of JShell does not have this issue but several of the
>> recent JDK 15 builds have done this.
>>
>> -- 
>> Aaron Scott-Boddendijk