RFR(S): 8134889: Kitchensink stress test crashes with out of memory error

Derek White derek.white at oracle.com
Wed Apr 20 21:48:28 UTC 2016


Still looking for reviews for a small fix for a P2 bug...

Thanks!

On 4/7/16 6:07 PM, Derek White wrote:
> Summary:
> The remaining part of this bug deals with running out of address space 
> on 32-bit JVMs running on Win64. This fix is simply to have a hard 
> limit on GC threads (still larger than necessary) on 32-bit JVMs. The 
> new limit is 16 (2 * switch_pt).
>
> Note that this overlaps somewhat with several "# of GC thread" bugs 
> including:
>  - 8131932 <https://bugs.openjdk.java.net/browse/JDK-8131932> : 
> Ergonomics oversize number of GC threads for small JVMs on large systems
>  - 8153225 <https://bugs.openjdk.java.net/browse/JDK-8153225>: G1 
> creates too many concurrent refinement threads by default
>  - 7189147 <https://bugs.openjdk.java.net/browse/JDK-7189147>: GC 
> threads should be created as needed not all at once
>
> Doing the correct thing in general will require a lot more performance 
> analysis. The fix here is simple, only affects 32-bit JVMs running on 
> >= 24 core machines, and will reduce OOM crashes in nightly testing.
>
> BUG: 8134889 <https://bugs.openjdk.java.net/browse/JDK-8134889>
> WEBREV: http://cr.openjdk.java.net/~drwhite/8134889/webrev.01/
> TESTS: jprt
>

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