RFR(XS): 8075071: [TEST_BUG] TimSortStackSize2.java: OOME: Java heap space: MaxHeap shrinked by MaxRAMFraction

[David Holmes]

Hi Lev,

On 18/03/2015 9:07 AM, Lev Priima wrote:
> Possible, by determining of disabled UseCompressedOops option and
> forking vm again with required minimum heap value(-Xms).
> Please review update: http://cr.openjdk.java.net/~lpriima/8075071/1/webrev/

Yes that is the approach that is needed. But didn't you need to set Xmx 
not Xms to deal with the MaxRAMFraction problem?

Thanks,
David

> Lev
>
> On 03/17/2015 03:23 PM, David Holmes wrote:
>> So this is a problem that needs to be resolved. The memory
>> requirements of the test are platform dependent but can't be satisfied
>> on all platforms. Though I am surprised that 770M is needed given that
>> two incarnations ago we set -Xmx to 385M!
>>
>> But it is appearing to be impossible to run this test in a way that
>> can work on all platforms.
>>
>> David
>>
>> On 17/03/2015 10:15 PM, Lev Priima wrote:
>>> Yes.
>>>
>>> Lev
>>>
>>> On 03/17/2015 02:56 PM, David Holmes wrote:
>>>> On 17/03/2015 9:15 PM, Lev Priima wrote:
>>>>> Hi David,
>>>>>
>>>>> Explicit -Xmx does not allow explicit MaxRAMFraction to shrink
>>>>> MaxHeapSize down to -Xms(or even less down to default
>>>>> InitialHeapSize in
>>>>> case if -Xms also wasn't set explicitly). In other words explicit -Xmx
>>>>> has priority over explicit MaxRAMFraction if both are set and
>>>>> contradict
>>>>> with each other.
>>>>
>>>> Okay - that's good to know.
>>>>
>>>> However the -Xmx770m is a problem - our small devices only have 512MB
>>>> of memory. Is the 770M only needed for 64-bit with -UseCompressedOops ?
>>>>
>>>> Thanks,
>>>> David
>>>>
>>>>
>>>>> Lev
>>>>>
>>>>> On 03/17/2015 07:40 AM, David Holmes wrote:
>>>>>> Hi Lev,
>>>>>>
>>>>>> On 17/03/2015 6:30 AM, Lev Priima wrote:
>>>>>>> Please reviewand push:
>>>>>>>
>>>>>>> Issue:https://bugs.openjdk.java.net/browse/JDK-8075071
>>>>>>> Patch: http://cr.openjdk.java.net/~lpriima/8075071/0/webrev/
>>>>>>>
>>>>>>> Tested locally:
>>>>>>> jtreg -vmoptions:"-XX:MaxRAMFraction=9223372036854775807
>>>>>>> -XX:-UseCompressedOops" test/java/util/Arrays/TimSortStackSize2.java
>>>>>>> Test results: passed: 1
>>>>>>
>>>>>> How does MaxRAMFraction interact with -Xmx?
>>>>>>
>>>>>> Thanks,
>>>>>> David
>>>>>>
>>>>>>> Lev
>>>>>>>
>>>>>
>>>
>