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Dynamic RAM Preview memory limit
I have PC with 4 Gigs of RAM. XP only sees 3 Gigs. In Vegas under Dynamic RAM Preview it is shown that 1920MB are available. However if I set the DRP to anything more than 1300MB Vegas crashes. (NOTE: when you put the DRP to 1300, in performance monitor you can see that Vegas ends up using almot 1500MB of RAM). I first thought it was a Windows memory issue. So I loaded up windows with almost all my applications by runing them all simultaneously. That bumped up my memory usage by about 500MB. So if it was a Windows issue then Vegas on my next test should fail at about 1000MB. So I ran the test and Vegas ran and I watched the memory go up on the perfromance monitor and it peak near 1500 and finished rendering.
Has anyone else experienced this? Is there some documentation or resultion about this?
Thanks.-Arash
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2 Replies
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The 3GB and 4GB ceilings are recent history for x86 machines. 2GB is related to the memory model that the compiler/assembler adheres to which probably equates to a signed 32bit number (31 bits of addressing) for a safety factor when doing math that might otherwise make the 32nd bit come active and cause the OS to throw the dummy out of the pram.
I wouldn’t expect much to change until Vegas becomes 64bit which, as Windows then supports it, more than 4GB will become addressible by the OS part of the memory management of a computer.
Recommendation: keep the preview memory well below the 1GB poing and run other apps in the headroom you’ve got. Like DVD Architect!
fwiw Windows 2003 Server SP1 or above can see upto and beyond the 4GB without going into the full 64bit instruction set / execution engine game. If money is no object and while we wait for Vegas to be ported to XP64/Vista. Tweaks to get more than 3GB aren’t worth pursuing on 32bit Windows for the reasons you stated. Most Windows apps have a 2GB ceiling, if it is even that high.
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This issue has cropped up every few months. Vegas 6.0 runs smoothest and has no memory problems to speak of if the DRP is kept low, very low like 16MB. When rendering this is the best setting from my experience. We do quite a few TV commercials and it is then great to use 1GB or so to get a full 30 seconds into ram for client previews. Start editing with DRP set high and the preview is lightly to drop below full frame rate and playback becomes choppier. I have never had a hang or crash when the DRP is set under 64MB. Stick it up around 1GB plus and you are inviting run-away Page File size and and all consuming run on your ram until Vegas hangs. This isn’t always the case but it seems to be worse if you are rendering segments that include large pixel dimension still images. There doesn’t appear to be any benefit of running more than 2GB ram with Vwgas under XP. If there is I would love to know!
Chris Young
CYV Productions
Sydney
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