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Not using all my RAM, but I want it to
I have 9GB of RAM installed on my MacPro. I’ve installed MenuMeters to see how much RAM is being used when I work in AE.
When I do RAM previews, it stops rendering when it reaches HALF of my RAM being used. So my RAM previews are always cut short. This is why I bought so much RAM, and now AE isn’t even using it, or so it seems from what I can tell.For example, right now I’m rendering and it says “79% used of 3.0GB”
Why does it say 3.0GB instead of 9GB, or at least something much closer?
Actually – another problem – now I can’t even finish rendering.
I’m getting an error that says:
“unable to allocate space for a 4200 x 2904 image buffer. You may be experiencing fragmentation. In the Memory & Cache Preferences box, try decreasing the Maximum RAM Cache Size value and selecting the Enable Disc Cache option, increasing Maximum Memory Usage, or both.”Ok, so I went to look at those settings and have this currently:
Maximum Memory Usage: 120% = 3.0GB (by the way, if I change that number to anything from 100% or above, the 3.0GB stays the same)
Maximum RAM Cache Size: 80% = 2.4GBAnybody have any ideas? Are there settings I can adjust or something else I can do?
Thanks,
Brian,. -
2 Replies
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[Brian Covalt] “Ok, so I went to look at those settings and have this currently:
Maximum Memory Usage: 120% = 3.0GB (by the way, if I change that number to anything from 100% or above, the 3.0GB stays the same)
Maximum RAM Cache Size: 80% = 2.4GB”120% for your Maximum Memory Usage is good…
Your Maximum RAM Cache Size is far too high. Lower that to 60% or lower.
AE is limited to a theoretical maximum of 3GB of RAM per instance (more on that later). In practice you should never use more than 2GB of RAM and probably not more than 1.2GB or so of RAM for your RAM Cache. The more RAM you allocate for the cache the more likely you are to experience render errors.
If you have a machine with multiple processing cores and a 64-bit OS you can enable Multiprocessing in AECS3’s prefs. This will enable a separate RAM cache for each processing core until you run out of RAM or cores (i.e. 1.5GB of RAM x 8 cores = 12GB of RAM required to render with a 1.5GB cache on 8 cores simultaneously).
Since you have a MacPro, you have at least 4 cores and a 64-bit OS. So you should definitely consider enabling Multiprocessing.
Summary:
1) Lower your Maximum RAM Cache to somewhere between 40-60%.
2) Enable Multiprocessing.
Darby Edelen
NVIDIA
Santa Clara, CA -
hey, thank you very much for that info. That helped a lot in clearing up what was going on and how to best utilize my system.
Thanks again!
Brian,.
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