Date: Wed, 26 Apr 2006 09:50:37 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Andrew Pantyukhin <infofarmer@gmail.com> Cc: Iantcho Vassilev <ianchov@gmail.com>, FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Huge (100k+) number of processes Message-ID: <20060426145037.GA6516@dan.emsphone.com> In-Reply-To: <cb5206420604260721h5affdb05pacd3bb0b82f0d621@mail.gmail.com> References: <cb5206420604260527h40b1db13o51a5ac1d11a651cd@mail.gmail.com> <18e02bd30604260709m6a0c33dp972a4f1d0a0e17ea@mail.gmail.com> <cb5206420604260721h5affdb05pacd3bb0b82f0d621@mail.gmail.com>
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In the last episode (Apr 26), Andrew Pantyukhin said:
> On 4/26/06, Iantcho Vassilev <ianchov@gmail.com> wrote:
> > On 4/26/06, Andrew Pantyukhin <infofarmer@gmail.com> wrote:
> > > I was wondering if it's possible to run over 100k processes
> > > simultaneously on a FreeBSD box with sufficient amount
> > > of RAM (and CPU power).
> >
> > Sure,why not?
>
> The problem is that kern.maxproc=200000 line in /boot/loader.conf
> only raised the real value to 21576. Is that authoritative, or should
> I just try and run 200k processes? I only have 512Mb of RAM, and I
> wonder if it's enough to run 100k+ of, say, /bin/sleep?
Make sure you have enough RAM to cover those 100k processes. There's
code that limits maxproc to physpages/12 ("Limit maxproc so that kmap
entries cannot be exhausted by processes"). You can try removing that
code, but each process does require a couple of private pages.
Assuming 5 pages, you'll need 2 GB of RAM just for that overhead,
before you take into account any memory your application will allocate.
Are you sure you need 100k separate processes running?
--
Dan Nelson
dnelson@allantgroup.com
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