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Question by chillypacman · Oct 21, 2014 at 01:47 PM · c#performanceprofilergarbage-collection

Intermittent slow downs in Unity - unrelated to garbage collector

Every few seconds Unity slows down heavily, especially 'scripts' and 'others' which spike hard in the profiler, I thought it was garbage collection but it doesn't look like it.

![I've attached the profiler from around the same moment, red is 'others', green is scripts and brown is garbage collector][1]

I checked the script usages and there is no significant (if any) change between how much scripts were being used - furthermore I put the game in a situation where it flatout did not instantiate anything and the framerate still got jerky from time to time.

ANy ideas what I should be looking for to fix this?

spikes.png (21.5 kB)
spikes.png (21.5 kB)
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avatar image KayelGee · Oct 21, 2014 at 01:52 PM 0
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Did you experience this on different machines aswell?

avatar image chillypacman · Oct 21, 2014 at 02:02 PM 0
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Yes.......

avatar image KayelGee · Oct 21, 2014 at 02:08 PM 0
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Well then this is hard. How is your memory footprint looking? Do you have a memory leak by any chance and Unity runs out of memory and paging starts?

avatar image _dns_ · Oct 21, 2014 at 02:51 PM 0
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Hi, have you tried to call GC.Collect() yourself each frame so you can be sure it's not the garbage collection that causes those spikes ? Also, maybe you can play with the Time.timeScale to slow down your game and check if those spikes happen less often: then they would be more FixedUpdate()-related (physics maybe) than Update() related. To search for causes, I would also disable the maximum of scripts/objects, have a $$anonymous$$imal scene etc, until there is no more spikes, then add them back one by one to spot the cause.

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Answer by Anxo · Oct 21, 2014 at 01:57 PM

Please post the code that is causing your spikes, The current information is very vauge but if I am going to shoot blind I would say take a look at the script and make sure you replace any GameObject.Find with GameObject.FindTag and if you have them in a loop, I would say find it before hand and store it in a variable before you get into the loop.

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avatar image chillypacman · Oct 21, 2014 at 02:02 PM 0
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There is nothing in my code that is causing the spikes - the profiler is not indicating anything different about the spikes whatsoever as far as scripts are concerned, the graph is simply beco$$anonymous$$g much larger and that's it.

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