On Fri, Oct 20, 2006 at 12:55:47PM -0700, Russ wrote:
> My commercial app has a ram cache system for image sequence playback; images
> can be tens of megabytes and there can be gigabytes of them. On OS X, when the
> RAM cache is large, it looks like the darwin pageout demon is activating
> prematurely, paging out part of the RAM cache preemptively to meet its
> free-space target, even though there is no competing demand. Consequently, the
> app thrashes catastrophically to its knees.
I assume all these images are read in from disk - since you're doing
your own caching, are you using F_NOCACHE with fcntl(2)? It may be
that the aggressive file caching done by the kernel is fighting
with your cache for RAM.
Cheers,
--
Paul Ripke
Unix/OpenVMS/TSM/DBA
I love deadlines. I like the whooshing sound they make as they fly by.
-- Douglas Adams
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