Request for review (xs) - 8000325
jon.masamitsu at oracle.com
Sat Jan 5 00:57:41 UTC 2013
Yes, the differences were statistically significant.
On 1/4/2013 4:10 PM, Srinivas Ramakrishna wrote:
> Thanks for the perf data, Jon! I'd say that's not too bad.
> Out of curiosity, was the diff statistically significant per appropriate
> T-test? (i've seen remark pauses show some variance depending on
> application and tuning.)
> -- ramki
> On Fri, Jan 4, 2013 at 3:23 PM, Jon Masamitsu<jon.masamitsu at oracle.com>wrote:
>> On 11/29/2012 3:17 PM, Srinivas Ramakrishna wrote:
>>> Looks good. Would be great to prominently release-note this change when it
>>> appears in a public/GA update/release.
>>> Out of curiosity, any perf data on CMS pause time diffs from this change
>>> with current NPG?
>> I ran refworkload server_reference and saw a regression only on
>> specjbb2000. The regression was on the
>> remark pauses (as would be expected) and the largest I saw was about 12%.
>> Larger than I would have
>> hoped. The unloading is done serially so maybe things around it got
>> -- ramki
>>> On Thu, Nov 29, 2012 at 9:46 AM, Jon Masamitsu<jon.masamitsu@**oracle.com<jon.masamitsu at oracle.com>
>>> This is a change in the default class unloading policy for CMS.
>>>> 8000325: Change default for CMSClassUnloadingEnabled to true
>>>> With perm gen removal it becomes important for CMS to unload
>>>> classes to avoid excessive consumption of native memory for
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