Author Topic: Low FPS, CPU and GPU utilization  (Read 266 times)

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Offline Mr_C

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Low FPS, CPU and GPU utilization
Hi all, I'm having a problem with FSO for some years now. I thought it was due to the limits of a GTX750TI I had. Now the system I use is an overclocked 8370, 16Gb Ram and an RX580 8Gb. There is no change in fps. I get slow downs that make gameplay choppy. Opening up task manager shows low CPU utilization on all cores and the GPU is also low. I don't get it  :confused:
For example, in Blue Planet, the Massive battle simulator gives 6.8fps average with CPU running at 20% and GPU around 47%.
Kentauroi race starts up at 37 fps typically, but if I turn the ship and look at empty space for a couple seconds, then, it goes up to 75fps and when I turn back around it holds the higher fps...
Any assistance will be greatly appreciated. What other information do you need?
« Last Edit: June 17, 2019, 10:24:42 pm by Mr_C »

 
Re: Low FPS, CPU and GPU utilization
Freespace Open utilises only a single CPU core, hence low total usage. You'd need to monitor the one core that bears most of the load. It's normal for the GPU to do next to nothing when the CPU chokes up.

While FSO gets about 30% of a performance hit on AMD graphic cards due to poor OpenGL driver support, the 580 should be more than enough to play this game comfortably.

You could also try playing the Icarus cutscene (first mission of War in Heaven 2), I think it's a bit more realistic load.

As for the graphic settings you can try to squeeze more FPS by disabling shadows. You could also check if disabling deferred lighting brings any increase in performance.
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Offline Colonol Dekker

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Re: Low FPS, CPU and GPU utilization
Resolution and detail are the two things that hit me most.
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Offline deathspeed

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Re: Low FPS, CPU and GPU utilization
Is FSO one of those games that benefits from setting the CPU core affinity to single core?  I remember doing that for some older game in the past.
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Offline Colonol Dekker

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Re: Low FPS, CPU and GPU utilization
Give it a try :yes:
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Re: Low FPS, CPU and GPU utilization
Resolution and detail level should mostly have effect on the GPU usage. I doubt it will help with CPU bottlenecks, unless you go down to potato levels.

You could try setting FSO affinity to one or two cores (I've seen it regularly do stuff on the second one, not sure why). Another thing would be setting its priority to something higher or even real time.

Also note that WiH has got some really complex lighting in missions and it complicates the rendering work a lot. Many other FSO campaigns need far less power to play comfortably.
Mito [PL] - Today at 8:52 PM
I was supposed to make a short presentation about basics of optical fibers and here I am, listening to Eurobeat while reading about quantum cryptography.

 

Offline Mr_C

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Re: Low FPS, CPU and GPU utilization
Disabling shadows helped a little.
And yes, one core was close to 85%.
Setting affinity maxed out that specific core and maybe helps 1-2 fps.
Anything but the native resolution looks, well, not as great.
So it looks like the bottle neck is the CPU single core performance like you said.

Thanks everyone for your advice.

 

Offline niffiwan

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Re: Low FPS, CPU and GPU utilization
(I've seen it regularly do stuff on the second one, not sure why).

There's a small amount of multi-threading in FSO, IIRC the "standard" music runs in its own thread.
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Re: Low FPS, CPU and GPU utilization
shadow quality 2 is a spectacular framerate drain for not a lot of gain

AMD cards in general all underperform when running FSO since it uses OpenGL and AMD don’t have the resources to write good OGL drivers.
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