extremely poor performance with many maiboxes for 'list "" *'

Wesley Craig wes at umich.edu
Thu Apr 19 13:50:36 EDT 2007

I've seen problem like that, but I identified issues in the  
auth_canonify() code for kerberos.  You don't appear to be using  
kerberos, so your situation is likely to be different.  On the other  
hand, I can speculate that LIST is much slower than grep because  
imapd needs to determine whether every mailbox is readable by the  
user.  That sort of calculation is significantly more intensive than  
simple pattern matching.  Also, rather than replicating your  
environment in test and doing a full profile, I'd probably start by  
strace-ing a process that I was talking to with imtest.  I suspect  
you'll find that imapd is accessing the filesystem in a most  
inefficient way.


On 19 Apr 2007, at 12:58, Greg A. Woods wrote:
> I'm wondering if anyone else has seen this kind of problem and whether
> or not anyone has looked into possible causes yet or not.

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