[OpenAFS] Performance compared to ext2

Derek Atkins warlord@MIT.EDU
30 May 2002 13:07:41 -0400

Was this the first time through or the second?  The second time
through should be much faster.  Also, what's the size of your stat
cache?  It's possible that the time is being spent stat()ing so many
files that your stat cache is thrashing (which would cause a similar
problem).  If your cache (or stat cache) is thrashing, that would
certainly explain a lot of slowness.

Try increasing your stat cache by changing the -stat option to


Jacob Gorm Hansen <jg@ioi.dk> writes:

> hi,
> I setup a project to compile a linux kernel in AFS space.
> The same machine acted as server and client, so no actual network traffic 
> was involved.
> However, AFS was more than twice as slow as ext2, when running make in the
> linux2.2 source tree without changed files.
> I would understand that an actual compile would be slower in AFS, due to the
> lack of write caching and so on, but what I'm doing here is basically just
> stat() a lot of files, and I don't see why this is so much slower than ext2.
> The cache size is 250MB.
> Any suggestions on how to make this run any faster?
> Thanks,
> Jacob
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       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
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