RFR: 8081317: [NEWTEST] documented GC ratio tuning and new size options should be covered by regression tests

Michail Chernov michail.chernov at oracle.com
Fri Aug 7 17:34:06 UTC 2015


Hi Igor,

Thanks a lot!

Michail


On 07.08.2015 16:52, Igor Ignatyev wrote:
> Hi Michail,
>
> looks good to me.
>
> Igor
>
> On 08/04/2015 05:35 PM, Michail Chernov wrote:
>> Hi,
>>
>> Could someone please take a look at this review?
>>
>> Thanks,
>> Michail
>>
>> On 31.07.2015 20:30, Michail Chernov wrote:
>>> Hi,
>>>
>>> Please review these changes for JDK-8081317. There are new tests to
>>> cover GC ratio tuning and new size options.
>>>
>>> Webrev:  http://cr.openjdk.java.net/~mchernov/8081317/
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8081317
>>>
>>> TestMaxMinHeapFreeRatioFlags.java - Verify that heap size changes
>>> according to max and min heap free ratios.
>>>
>>> TestMinAndInitialSurvivorRatioFlags.java - Test verifies that VM can
>>> start with any GC when MinSurvivorRatio and InitialSurvivorRatio flags
>>> passed and for Parallel GC it verifies that after start up survivor
>>> ratio is equal to InitialSurvivorRatio value and that actual survivor
>>> ratio will never be less than MinSurvivorRatio.
>>>
>>> TestNewRatioFlag.java - Verify that heap divided among generations
>>> according to NewRatio.
>>>
>>> TestNewSizeFlags.java - Verify that young gen size conforms values
>>> specified by NewSize, MaxNewSize and Xmn options.
>>>
>>> TestSurvivorRatioFlag - Verify that actual survivor ratio is equal to
>>> specified SurvivorRatio value.
>>>
>>> TestTargetSurvivorRatioFlag.java - Test if objects size is less than
>>> (survivor_size * TargetSurvivorRatio / 100) then objects are stayed in
>>> survivor space until MaxTenuringThreshold minor GC cycles. If more
>>> than (survivor_size * TargetSurvivorRatio / 100) objects were
>>> allocated, then test verifies that after MaxTenuringThreshold minor GC
>>> cycles survivor space is almost empty.
>>>
>>> New changes were tested on different platforms including embedded jdk
>>> on Linux x86.
>>>
>>> Thanks,
>>> Michail
>>>
>>
>



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