[FWTools] MrSID Reader performance?
Jason.Birch at nanaimo.ca
Wed Feb 7 16:56:02 EST 2007
> I suspect you are seeing cache thrashing in which case
> you will want to set the GDAL_CACHEMAX environment
> variable to a fair sized number (eg. 200).
Thanks Frank, that has helped immensely.
Is there a downside to setting that value really high, other than taking
the memory away from other system processes?
I don't see any real performance difference between 200MB and 500MB
(about 100KB/s output), so this seems like it's one of those things that
doesn't matter unless you hit a certain threshold, but hitting that
threshold is something I'd like to avoid in the future :)
I think when I set it to 1000 it behaved as if it was not set at all.
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