decoupling interpreter buffers from the JIT's value processing

Paul Sandoz paul.sandoz at oracle.com
Fri Jul 7 16:41:23 UTC 2017


Thanks, i added that to the wiki page, primarily so I don’t forget:

  https://wiki.openjdk.java.net/display/valhalla/Minimal+Value+Types+and+Valhalla+value+types+command+line+options <https://wiki.openjdk.java.net/display/valhalla/Minimal+Value+Types+and+Valhalla+value+types+command+line+options>

Paul.

> On 7 Jul 2017, at 08:52, Vladimir Ivanov <vladimir.x.ivanov at oracle.com> wrote:
> 
>> How do you determine if there are allocations or not? some specific hotspot flags?
> 
> Yes, diagnostic EA output and eyeballing generated code (w/ -XX:-UseTLAB):
>  -XX:+PrintEliminateAllocations -XX:+PrintEscapeAnalysis
> 
> Best regards,
> Vladimir Ivanov
> 
>>> On 7 Jul 2017, at 05:19, Vladimir Ivanov <vladimir.x.ivanov at oracle.com> wrote:
>>> 
>>>> Here is a first shot:
>>>> http://cr.openjdk.java.net/~roland/8183137/webrev.00/
>>>> I don't see the allocations in your test anymore. Can you give it a try?
>>> 
>>> Thanks, Roland! I confirm that there are no allocations left in the loop test I wrote (VectorTest::sumArrayL2). I'll experiment with other code shapes and let you know about the results.
>>> 
>>> Best regards,
>>> Vladimir Ivanov



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