[Patch] ParallelGC: Improve AlwaysPreTouch with multiple threads

[stefan.johansson at oracle.com]

Hi Amit,

I've now created a webrev and JBS entry for your proposal. Here are the 
links:
Webrev: http://cr.openjdk.java.net/~sjohanss/sponsor/amit.pawar/8252221/00/
JBS: https://bugs.openjdk.java.net/browse/JDK-8252221

Thanks,
Stefan

On 2020-08-21 13:48, stefan.johansson at oracle.com wrote:
> Hi Amit,
> 
> Now the patch made it through =)
> 
> Me or somebody else from the GC-team will provide feedback once we find 
> time to look at the patch.
> 
> Thanks for reaching out,
> Stefan
> 
> On 2020-08-21 13:39, amith pawar wrote:
>> Hi Stefan,
>>
>> Thanks for replying. First time got rejected and then resent it after 
>> subscribing to the group. Not sure how this happened.
>>
>> I am attaching again. Please do check.
>>
>> Thanks,
>> Amit Pawar
>>
>> On Fri, Aug 21, 2020 at 1:29 PM <stefan.johansson at oracle.com 
>> <mailto:stefan.johansson at oracle.com>> wrote:
>>
>>     Hi Amit,
>>
>>     Your patch did not make it to the list. It might have been stripped.
>>     Are
>>     you subscribed to the list? That might be required to attach patches.
>>
>>     Thanks,
>>     Stefan
>>
>>     On 2020-08-20 19:33, amith pawar wrote:
>>      >   Hi,
>>      >
>>      > Currently AlwaysPreTouch for ParallelGC is done with a single
>>     thread and
>>      > this attached patch converts it to multithreaded similar to other
>>     GCs.
>>      >
>>      > All JTREG tests passed without new failures.
>>      >
>>      > Time taken for pretouch on EPYC server with 1TB memory and 128
>>     threads
>>      > Before fix: ~107 s
>>      > After fix   :  ~14 s
>>      >
>>      > Please review this attached patch and give your feedback.
>>      >
>>      > Thanks,
>>      > Amit Pawar
>>      >
>>
>>
>>
>> -- 
>> With best regards,
>> amit pawar