#Does anyone know how to use Nsight Systems? I'm trying to profile my Opengl game

41 messages · Page 1 of 1 (latest)

bold ingot
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I have some wierd lag spikes and I was able to identity it inside Nsight Systems but I don't know how to interpret the data

north flame
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use nsight graphics instead, then use the gpu trace feature

bold ingot
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hm I first tried that but (probably I don't know how to use it) I was able to capture only one frame. Can I capture multiple frames using it? My problem happens from time to time so I can't just profile a random frame to debug it

north flame
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gpu trace can capture multiple frames in sequence (a low count though)

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what are you trying to profile?

bold ingot
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I get a wierd big lagspike from time to time

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Like it can get to 30 ms or more

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but I don't know when it happens, that's what I'm trying to figure out

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so I need to profile multiple frames untill a get a "problematic frame"

north flame
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hmm you could use timer queries to time each pass and store the results over time, then plot it

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then you might see which ones spike

bold ingot
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yes I have that in my program

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but I can't like tell apriory when that would happen to start the profiler

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or maybe I didn't understand what you proposed

bold ingot
north flame
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I presume you're using opengl

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you can record two GPU timestamps, then take the difference to roughly see how long all the commands between the start and end took to execute

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if you do this every frame, you can plot how long it took various passes to execute

bold ingot
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I see ok

north flame
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like in this vid

bold ingot
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so you are saying that nsigny system won't help me in this case?

north flame
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idk, I haven't used it frognant

bold ingot
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?

north flame
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imgui + implot

bold ingot
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I also use Imgui but yours looks nicer

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I see

north flame
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I'm using a custom theme

bold ingot
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nice stuff

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Ok I need to look into query objects than

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thanks

lavish dock
bold ingot
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thanks

bold ingot
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it doesn't seem to corelate with my lag spike

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like I profiled the entire main rendering part

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and it didn't spike

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tho I am clearly getting massive lag from time to time from swap buffers

austere kernel
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afaik swapbuffers can lag since it also makes sure the GPU is synced or smth. It makes sure all commands ran correctly.