Bullet Optimisation

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gus
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Joined: 11 Aug 2011, 15:41

Bullet Optimisation

Post by gus » 11 Sep 2011, 14:11

Let's starts back where we finished last time:

First, here is the link to the previous discussion:
http://openmw.org/forum/viewtopic.php?f=13&t=129

So K1ll, could you do some testing for me? More specifically, could you go in libs/openengine/bullet/physic.cpp and look at line 285 :

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dynamicsWorld->stepSimulation(deltaT,1,1/50.);
and try out some different values? For exemple:

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dynamicsWorld->stepSimulation(deltaT,1,1/30.);

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dynamicsWorld->stepSimulation(deltaT,1,1/20.);

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dynamicsWorld->stepSimulation(deltaT,1,1/10.);

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dynamicsWorld->stepSimulation(deltaT,1,1.);

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dynamicsWorld->stepSimulation(deltaT,1,5.);
And report the FPS?

Could you also do it for this?

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dynamicsWorld->stepSimulation(deltaT,10,1/10.);

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dynamicsWorld->stepSimulation(deltaT,0,1/10.);

K1ll
Posts: 147
Joined: 06 Aug 2011, 21:54

Re: Bullet Optimisation

Post by K1ll » 11 Sep 2011, 23:13

Sorry for replying so late, but i was a bit busy this weekend.

I'll test those changes tomorrow at least on my old laptop mentioned in the old thread and my ubuntu 10.10 64 bit desktop.

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gus
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Re: Bullet Optimisation

Post by gus » 12 Sep 2011, 16:16

Thanks!
BTW,5 hours is pretty short for me ;)

K1ll
Posts: 147
Joined: 06 Aug 2011, 21:54

Re: Bullet Optimisation

Post by K1ll » 12 Sep 2011, 16:49

Well i have run tests with all the values you suggested. These are the results:

Parameter Value(s) | Interior fps (in Beshara) | Exterior fps (in Vivec)

Old Laptop:
1/50. | 28 | < 0
1/30. | 28-29 | < 0
1/20. | 51-53 | < 0
1/10. | (75) 80-85 | < 0
1. | 112-116 | < 0
5. | 113-117 | 0-11

10., 1/50. | 3 | < 0
0. 1/50. | 28-29 | < 0


Dekstop:
1/50. | 65-66 | 1
1/30. | 106-107 | 1
1/20. |124 | 1
(1/10. | 143 | 1
1.| 158-159 | 7-8
5. | 159-161 | 5-20

10., 1/50 | 63-66 | 1
0., 1/50 | 57-58 | 1

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gus
Posts: 390
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Re: Bullet Optimisation

Post by gus » 12 Sep 2011, 20:33

Could you do the same bench (just do few of them, like 1/50., 1/10. and 1.) with line 346 to 369 commented? (you can use /* */ to comment things)

And can i also have your desktop config?

K1ll
Posts: 147
Joined: 06 Aug 2011, 21:54

Re: Bullet Optimisation

Post by K1ll » 13 Sep 2011, 12:50

Here are the tests with the changes applied:

Old Laptop
1/50. | 28-29 | 0
1/10. | 85-86 | 0
1. | 110-113 | 0
5. | 111-115 | 4-12

Dekstop
1/50. | 72-75 | 1
1/10. | 143-144 | 1
1. | 159-160 | 8
5. | 162-163 | 8-22

Not much of a difference though.

The specs of my Desktop:

Ubuntu Maverick Meerkat 10.10 64 bit
AMD Athlon 64 X2 Dual Core Processor 6000+
8 GB DDR2 Ram
Nvidia GeForce 9800 GTX+ with 512 MB video ram

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gus
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Re: Bullet Optimisation

Post by gus » 13 Sep 2011, 14:50

Would it be possible to have a test on windows on the same machines? This would be very useful, as if it run correctly on windows, it might be a bug in bullet and not in OpenMW.

PS:a very stupid question: you compiled in release mode right?

K1ll
Posts: 147
Joined: 06 Aug 2011, 21:54

Re: Bullet Optimisation

Post by K1ll » 13 Sep 2011, 16:55

I don't have windows on the old laptop (it runs way to slow on it) but i can test it with win xp and win 7 on my desktop if you could compile the tests and upload the binaries.

I'm pretty sure that i don't use debug binaries atleast i didn't specify it explicitly.

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gus
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Re: Bullet Optimisation

Post by gus » 14 Sep 2011, 21:05

Here is a windows version:
http://www.megaupload.com/?d=8I70P6V5

Edit: BTW Zini, you can merge my bullet_bug branch in the main branch. There is a performance boost in this branch.

K1ll
Posts: 147
Joined: 06 Aug 2011, 21:54

Re: Bullet Optimisation

Post by K1ll » 18 Sep 2011, 18:17

I've tested on Windows XP and it has similar slowdowns they are just not as noticeable since sadly openmw seems to run a lot faster on windows in general.

In Beshara i had ca 250 fps and in Vivec it still managed to get 70+ fps. Without pyhsics i had nearly 500 fps in Beshara and about 200 fps in Vivec.

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