[OpenJDK 2D-Dev] <AWT Dev>  Review Request: JDK-8041900 [macosx] Java forces the use of discrete GPU
philip.race at oracle.com
Wed May 27 21:53:07 UTC 2015
Once lots of people start to use the integrated CPU I suppose there is a
likelihood of crashes and other problems with that too.
I would like to see this (a) selected based on battery or similar, not
(b) made controllable by a flag or similar,
and once that is done, get a lot of JDK9 bake time.
To be suitable for JDK 8u it would have to be "off by default".
On 05/27/2015 02:44 PM, Denis Fokin wrote:
> Hi Phil,
> Thank you for the comments. Actually, the battery life is not the only issue that experience our customers. I am getting crash reports that are reproducible only with discrete cards on MBP. Some users report hangs with discrete cards. All this issues are eliminated by switching on the integrated GPU. I am not sure, that discrete card gives significant performance improvement in jdk implementation. Other applications, like Chrome, use discrete video card only for WebGl or similar tasks.
> Thank you,
>> 27 мая 2015 г., в 21:09, Phil Race <philip.race at oracle.com> написал(а):
>> I suppose that NSOpenGLPFAAllowOfflineRenderers must prevent whatever 'tickling'
>> of the discrete GPU we do from automatically making it the active GPU ?
>> This seems to merit a source code comment as at face value it seems like an API that allows
>> you to use that (other) discrete GPU alongside the active GPU, but so we don't
>> need that part, just the side-effect behaviour.
>> But do we want this fix in this form ? The integrated GPU is going to perform far less well
>> than the discrete GPU. If the issue is battery life, then perhaps it should be tied
>> to whether we are running on battery or mains power. And then perhaps you need to figure out
>> how to switch GPU on the fly when you go from mains to battery.
>>> On 05/27/2015 08:08 AM, Denis Fokin wrote:
>>> Hi, Sergey,
>>> Basically, you should close all apps that can switch the vc including the utility for switching video cards. Make sure in About This Mac -> Displays that the integrated card is enabled. Start an application with the patched version of Java. Check About This Mac -> Displays. Integrated video card should be still active.
>>>> 27 мая 2015 г., в 17:30, Sergey Bylokhov <Sergey.Bylokhov at oracle.com> написал(а):
>>>> Hi, Denis.
>>>> Can you describe the steps on how to test it. On my mac it still change the vc.
>>>>> On 27.05.15 17:16, Denis Fokin wrote:
>>>>> Please review the fix for jdk9
>>>>> The fix allows do not force discrete video card usage on MacBook Pro models with two video cards. I have tested the fix on several MPBs.
>>>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8041900
>>>>> Webrev: http://cr.openjdk.java.net/~denis/8041900/webrev.00 <http://cr.openjdk.java.net/%7Edenis/8041900/webrev.00>
>>>> Best regards, Sergey.
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