improving concurrency/performance (fwd)

John Madden jmadden at
Wed Nov 9 08:52:17 EST 2005

>> This guy is having a problem with cyrus-imap and ext3 - when multiple
>> processes are attempting to write to the one filesystem (but not the one
>> file), performance drops to next to nothing when only five processes are
>> writing. An strace shows most of the time is being spent in fdatasync
>> and fsync.

Actually, the thread just got off topic quickly -- I'm running this on reiserfs,
not ext3.  ...And I've got it mounted with data=writeback, too.  But thanks for
the info, Andrew.


John Madden
UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden at

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