Re: Hard-limits for kern.maxproc
Re: Hard-limits for kern.maxproc
- Subject: Re: Hard-limits for kern.maxproc
- From: mm w <email@hidden>
- Date: Thu, 29 Jan 2009 14:53:43 -0800
I don't know Cyrus, but is there no way to setup this?
On Thu, Jan 29, 2009 at 2:45 PM, Nathan <email@hidden> wrote:
> On Thu, Jan 29, 2009 at 3:29 PM, William Kucharski <email@hidden> wrote:
>> Nathan wrote:
>>
>>> 1) Where can I download the kernel so I can look through some of the
>>> source myself? It's not on the list at macosforge.org.
>>
>> <http://www.opensource.apple.com/darwinsource/>
>
> Sweet! I thought I had discovered all of the Apple/OSS sites, but I'd
> missed that one somehow. New places to explore...
>
>>> 2) More description of NPROC, MAXUSERS, and "scales", and UNIX03 would
>>> be helpful. I'd be happy to read up on them if someone could point me
>>> in the right direction. Where should I look? The source code?
>>
>> That's the best place, or Amit Singh's "Mac OS X Internals" book.
>>
>> You can also learn much from reading other books on the design of UNIX, like
>> "The Design and Implementation of the 4.4 BSD Operating System" or "UNIX
>> Internals."
>
> Great suggestions. I went and ordered Amit Singh's book.
>
>>> 3) Does anyone know what buttons I could push at Apple to get (at
>>> least) the server kernel compiled with "larger scale" or something
>>> like that? I'd like this fix to be available to the larger community,
>>> which really means getting it into an official OS update.
>>
>> No idea, but is your mail server really so busy that there are THAT many
>> simultaneous users, or is there something else going on?
>
> Yes, I have that many simultaneous users. No, I'm only using the
> server for mail.
>
>> Have you verified that the process limit is, indeed, being hit?
>
> Yes.
>
> Is it really that hard to believe? I have over 250 employees, and
> cyrus seems to spawn three processes for each Mail.app user and one or
> two for each Thunderbird user. It's trivial for me to hit the 266
> process limit for the _cyrus user. Most of the time the connections
> aren't actually _doing_ anything, so the load (cpu, ram, bandwidth,
> disk activity, etc.) on my server is trivial.
>
> ~ Nathan
>
--
-mmw
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