Re: Hard-limits for kern.maxproc
Re: Hard-limits for kern.maxproc
- Subject: Re: Hard-limits for kern.maxproc
- From: Andrew Myrick <email@hidden>
- Date: Thu, 29 Jan 2009 16:47:42 -0800
Nathan,
On Jan 29, 2009, at 4:29 PM, Nathan wrote:
As I stated earlier, it just uses lots of processes, so as soon as
we were able to discover
that and raise the process limits in the kernel and launchd, all our
severe problems disappeared.
I believe that Cyrus has a "maxchild" option that limits the number of
processes it uses internally. I'm curious, what is the behavior of
Cyrus if you limit it to a few hundred processes in this environment?
That seems pretty common based on the conf files that I found with
Google, and I would expect Cyrus is capable of handling a few hundred
users with a few hundred processes as long as it knows that it can't
make more. Is that not the case? Three processes per Mail.app user
seems like an awful waste otherwise. Being a kernel engineer,
however, my knowledge of IMAP servers is rather limited. Does Cyrus
start rejecting connections in that case? Or is performance just
unacceptable?
-Andrew
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