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+--- Thread: understanding cpu usage and how to improve... (/showthread.php?tid=1162)
understanding cpu usage and how to improve... - Frank_red - 04-28-2011
Hi,
I just watched the behavior of the CPU usage during simulation.
I have an intel Core i7 920 OC to 3.2Ghz.
the simulation start and it uses the 13% of the cpu. when it reaches the advect velocities it boost up to 98% and one the Advect fiedls are done it drops again to 13%....
I'ld like to know if it's normal and if it's possible to improve...because it takes 2 min per frame for the simulation, but during 1min 25 sec the cpu is only at 13% ....
Maybe it's important to say that this scene use a particles set up.
Thank you for the attention.
Fra.
Re: understanding cpu usage and how to improve... - jrand - 04-30-2011
Ram is almost more important than CPU count/usage, if you have to cache to disk at any point in time your CPU is going to drop because of i/o bottleneck slowing things down. Also as I am sure your have noticed the simulation is done in stages, what you see with the drops ins usage correlates with each stage doesn't it?
Re: understanding cpu usage and how to improve... - Jordan - 04-30-2011
Like jrand said, have a look at the stages. Maybe its waiting on pFlow do calculate and since pFlow is not multithreaded then you would see cpu usage dropping to one core (100%/4 cores = 25% or if you have HT on 100%/8 cores = 12.5%).
Re: understanding cpu usage and how to improve... - sitnisati - 05-02-2011
Hello,
Well, applying sources is not multithreaded as well as saving data. Those two are the only parts of the program that does not use all the CPU power.
Kresimir
Re: understanding cpu usage and how to improve... - Frank_red - 05-02-2011
Thanks for the explanations, it makes sense.
I use a cache operator for the particles as I know it still single thread... I hope it changes some time soon.
I got 12GB ram and a velociraptor as cache disk... I must check all settings.
But my cpu is the week point as I do not keep it OC all the time as lately it played me few strange tricks...I'll be updating the cpu for a better core/ghz set up.
Thanks everyone for the help.
Fra.