[Gluster-devel] Quick Question: glusterFS and kernel (stat) caching

Bernhard J. M. Grün bernhard.gruen at googlemail.com
Mon Aug 6 12:22:09 UTC 2007

Hello developers!

At the moment we try to optimize our web server setup again.
We tried to parallelize the stat calls in our web server software
(lighttpd). But it seems the kernel does not cache the stat
information from one request for further requests. But the same setup
works fine on a local file system. So it seems that glusterFS and/or
FUSE is not able to communicate with the kernel (stat) cache. Is this
right? And is this problem solvable?

Here is some schematic diagram of our approach:
request -> lighttpd -> Threaded FastCGI program, that does only a stat
(via fopen) -> lighttpd opens the file for reading and writes the date
to the socket

In a local scenario the second open uses the cached stat and so it
does not block other reads in lighty at that point. but with a
glusterFS mount it still blocks there.

Maybe you can give me some advice. Thank you!

Bernhard J. M. Grün

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