On 2024-12-20 04:58, Cedric Blancher via Cygwin wrote:
On Fri, 20 Dec 2024 at 01:31, Brian Inglis via Cygwin <cygwin@cygwin.com> wrote:
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
Can we please get an interface in /proc OR /bin/getconf to get/probe
the maximum pid value?
Rename the program to sysctl and have it respond to arg kernel.pid_max with
kernel.pid_max = 4194304? ;^>
There appears to be no POSIX definition usable by getconf: why it is enabled by
a CW_... value accessible via cygwin_internal().
Linux makes it available only under /proc/sys/kernel/pid_max tunables which
Cygwin does not support as /proc/sys is for Windows objects.
BSDs including MacOSX seem to hard code 99999 now (was 30000).
Patches Gratefully Accepted!
--
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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