CGTalk - memory leak on particle disk cache

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mattswilson

01-24-2005, 01:21 AM

I am working on a relatively simple dynamics scene. There a three fields, and one emitter, the emitter is set to 500k but the particles are caped off to 22k, with a lifespan of 2.25. The fields are being applied to the particle per vertex. when i attempt to run the cache the scene ALWAYS gives me a memory exception error and stops the cache. What the hell is going on, I have had scenes way over this in count with expressions, and collisions. Any ideas as to what might be going on. The sequence is 2000 frames long and dies well before 1000. System is a dual 3.4 Xeon64 with 3G, and a quadro FX 1300(more than enough for everything so far)

Also, is there a way to cache from the command line? Would i have better luck running the sim on a G5?
thanks,
Matt Wilson

luispages

01-26-2005, 12:40 AM

alexx

01-26-2005, 03:08 PM

Well did you check your HD space, remember that cache files are huge specially in a scene with +22k particles for 2000 frames, it looks like you may need more than 5 or 6 gigs to cache that, your system looks really strong, doing in on a G5 I dont think it'll make a huge diff...

sure thats a thing. but i am about 99.99% sure there are more than one memory leaks in particles in maya (especially in hardware render buffer).
but unfortunately i am not abel to pinpoint any of them and so the return of alias support usually is: use particle disk cache.

if you now found a leak there that makes me really shiver.

cheers

alexx

mattswilson

01-26-2005, 03:20 PM

yeah, I could see that disk space thing being a problem, but I have 150free Gigs left on my sytstem disk and 250 gigs left on my working disk, so I think I am ok for space. The hole during cache is I think a windows ram issue. I am trepidacious about using the 3GB hack but that might have helped. Surprisingly using a G5 did help. It was slower to finish but it did finish. I still can't figure out what it was about that scene that did it, but it also cached when i split the scene in two time chuncks. Unfortunately though I had to hack the comp to blend between the two sequences.

I think it's just another annoying windows problem(not the poor guys at Alias who do their best to wee through them). Kudos Apple for being able to handle the load... maybe its time to switch to linux!

alexx

01-26-2005, 03:30 PM

would still be a good idea to report the problem to alias.

if no one tells them, they cant fix it :)

cheers

alexx

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