This seems to not have been important enough for anybody to work on :-/
But I thought I could recheck this today and I think the issue is resolved:
<IfModule mpm_worker_module>
StartServers 2
MinSpareThreads 80
MaxSpareThreads 200
ThreadLimit 500
ThreadsPerChild 250
MaxRequestWorkers 4000
MaxConnectionsPerChild 0
</IfModule>
ps -eLf | grep ^www-data | wc -l
252
That is 250 workers plus 2 base processes
With the slowtest running:
$ slowhttptest -c 20000 -H -g -o my_header_stats-20k -i 10 -r 2000 -t GET -u
http://localhost/ -x 24 -p 3
I get much more spawned:
ps -eLf | grep ^www-data | wc -l
4032
That is the max limit of 4k that I set and a few other processes that manage
them.
Unfortunately I don't know when exactly, but in recent Ubuntu versions this is
fixed.
** Changed in: apache2 (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1628278
Title:
mpm_worker has a limit of 64 ThreadsPerChild even if you configure it
with a larger number
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