[Dovecot] severe performance problem (mail cache related?)

Timo Sirainen tss at iki.fi
Fri Feb 16 10:54:06 UTC 2007

On Fri, 2007-02-16 at 02:49 -0800, Dan Price wrote:
> > So.. Hmm. Could the problem simply be that the mmap-copy-growing is too
> > slow? If the user really has some 25MB cache file, that could be it. I
> > think I could change the code so that it mmap()s immediately enough
> > memory to fit the whole cache file. Probably a good idea to do anyway.
> Cool-- of course, I missed that we were growing at pagesize (8K).

Yes, I didn't actually realize that before just now. That's horribly
slow. I'll have to make it grow the memory in larger chunks in any

This should anyway help with the initial mapping:


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