RFR 8204525: [TESTBUG] runtime/NMT/MallocStressTest.java ran out of java heap

[Harold David Seigel]

Thanks Zhengyu!

Harold

On 11/20/2018 10:28 AM, Zhengyu Gu wrote:
> Hi Harold,
>
> Looks good to me.
>
> Thanks for fixing it.
>
> -Zhengyu
>
> On 11/20/18 9:46 AM, Harold David Seigel wrote:
>> Hi,
>>
>> Please review this small change to fix test bug JDK-8204525. Test 
>> MallocStressTest quickly allocates lots of malloc memory and slowly 
>> releases it.  It checks that NMT properly measures the amount of 
>> allocated memory.  The test occasionally fails when it runs out of 
>> Java heap before the malloc memory allocations completed.
>>
>> The test has several threads that loop, allocating lots of memory.  A 
>> thread's allocations stop when its malloc allocation fails, or when a 
>> certain amount of time expires.  This fix also stops a thread's 
>> allocation when an OutOfMemoryError exception gets thrown.
>>
>> Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8204525/webrev/
>>
>> JBS Bug:  https://bugs.openjdk.java.net/browse/JDK-8204525
>>
>> The fix was tested on Linux X64, Windows, Solaris, and Mac.  It was 
>> also tested on Linux X64 with -Xmx20M, which, before this fix, 
>> reliably reproduced the failure.
>>
>> Thanks, Harold
>>