[osg-users] Long draw

[OpenSceneGraph Users]

Hi,

Yes, indeed - I actually tried disabling vsync and it rendered blazing 
fast and out of control. :-) But I want vsync and it's okay to be stuck 
at 60Hz. But even with vsync enabled draw shouldn't be that long, should 
it? It appears as if it takes a long time to draw with no room for more 
geometry or operations, although I suspect this is not the case but 
something weird is going on with the buffer swapping or similar. And 
especially since it sometimes drops down to a short draw after a while.

BTW, please sign your messages with your name, it doesn't show here if 
coming via the old osg-users at lists.openscenegraph.org address, nor does 
your e-mail address.

Regards,
Andreas


On 2020-08-13 14:01, OpenSceneGraph Users wrote:
>
> Hi,
>
> Frame rate stuck at 60Hz usually means vertical sync is on.
>
> On 2020-08-13 13:32, OpenSceneGraph Users wrote:
>
>> Hi,
>>
>> It's been a while since I tested rendering performance on my 
>> development machine and now I'm experiencing something vaguely 
>> familiar and quite annoying. Even with a very simple model, the 
>> statistics feature ('s') in the osgviewer application (3.6.4) reports 
>> a draw process taking over 16ms so that the rendering just barely 
>> makes it at 60Hz, see the attached screenshot. Sometimes it drops 
>> down to a short draw after a while, for no apparent reason, but more 
>> often it stays this long.
>>
>> This makes me doubt any further performance investigations, now 
>> knowing whether additional operations in a frame will make draw go 
>> over the 16.7ms limit or not.
>>
>> I vaguely recognize this from way back but I can't remember the 
>> cause, and I can't find anything about it in previous osg-users 
>> discussions. It feels like it's waiting for buffer swapping or 
>> something, and I wouldn't be surprised if it's something obvious that 
>> I should know. Maybe it's just the statistics reporting incorrectly? 
>> Does anyone recognize this and do you have any suggestions? It works 
>> on my older laptop but not on two of my desktop computers. My config 
>> below:
>>
>> Intel i7-4790K 4GHz
>> 16 GB RAM
>> GeForce GTX 970 with latest 451.67 drivers
>> Win10 Home
>> OSG 3.6.4
>>
>> Regards,
>> Andreas
>>
>>
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