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Message-ID:	<6193fecd-9116-4182-82ff-a7bdcc5a6dbd@SystematicSW.ab.ca>
Date:	Thu, 19 Dec 2024 17:30:23 -0700
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Subject:	Re: EPYC 144 core machine has issues with Cygwin PID wraparound
To:	cygwin AT cygwin DOT com
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	<Z2SvcYR7gFsh7-62 AT calimero DOT vinschen DOT de>
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From:	Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Brian Inglis <Brian DOT Inglis AT SystematicSW DOT ab DOT ca>
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On 2024-12-19 16:42, Corinna Vinschen via Cygwin wrote:
> 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.

Run the attached to check your upgrade:

$ gcc -o cyg_max_pid{,.c} && ./cyg_max_pid
max pid 65536

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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