Rohit Mehta on 17 Apr 2016 07:54:28 -0700

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Re: [PLUG] >32K concurrent processes

Some kernel parameters to research (which may not be right for your application)
and /etc/security.conf changes

Do these process do a lot of IO?  Is your storage rotational media or SSD?  Can your application run off ramdisk storage?  Have you tried enabling hyperthreading?

Do you have the ability to test application loads non-production system?  If so i'd be interesting in helping you poke around.  It might be an education for me.  

On Sun, Apr 17, 2016 at 10:42 AM, Rohit Mehta <> wrote:
Back many years ago, I installed Oracle on my Debian workstation for fun, and I remember the guide had a lot of tweaks.  "ulimit" is one that I can think of, but I don't remember them all.  I'm poking around the internet to see if I can find the oracle guide (although it might not be relevant on newer kernels)

On Sun, Apr 17, 2016 at 10:27 AM, K.S. Bhaskar <> wrote:
Thanks Steve, but in this case we have a customer need to crank up the number of processes on Linux.

-- Bhaskar

On Sat, Apr 16, 2016 at 4:09 PM, Steve Litt <> wrote:
On Fri, 15 Apr 2016 17:40:09 -0400
"K.S. Bhaskar" <> wrote:

> I am trying to crank up more than 32K concurrent processes (the
> processes themselves hang and do a teeny bit of activity every 10
> seconds). But the OS (64-bit Debian 8 - Jessie) stubbornly refuses to
> crank up beyond 32K-ish processes. pid_max is set to a very large
> number (1M), so that's not it. Any suggestions on what limits to look
> for appreciated. Thank you very much.

This is old information, but back in the day people who wanted lots and
lots of processes used one of the BSDs to host that server.


Steve Litt
April 2016 featured book: Rapid Learning for the 21st Century
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