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Date: Fri, 20 Dec 2024 00:42:41 +0100
To: cygwin AT cygwin DOT com
Subject: Re: EPYC 144 core machine has issues with Cygwin PID wraparound
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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On Dec 19 17:20, Cedric Blancher via Cygwin wrote:
> Good afternoon!
> 
> We have a new AMD EPYC machine with 144 cores (upgraded from 8 core
> machine) running Windows 10 Enterprise, with a mixture of native Win32
> apps+Cygwin.
> But the Cygwin apps cause trouble, as PID numbers get re-used too
> fast. We churn through ~~6912000 child processes EVERY HOUR, which now
> causes major problems with PID wraparounds in scripts and perl.
> 
> 1. How can I increase the value at which pid-wraparound will happen?
> 2. How can I test for Cygwins max PID value? Cygwin does not have
> /proc/sys/kernel/pid_max

We can't make the pid algorithm variable in terms of the max pid, so
I changed the maximum PID to the maximum pid on Linux, i.e., 4194304.

Please check out the next test release cygwin 3.6.0-0.294.g363357c023ce.

Thanks,
Corinna
         


> 
> Ced
> -- 
> Cedric Blancher <cedric DOT blancher AT gmail DOT com>
> [https://plus.google.com/u/0/+CedricBlancher/]
> Institute Pasteur
> 
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