Thank you very much Yann,
The workload will be static HTML files.
The site typically has 1.000 visits per hour, but some days it has a
sudden demand of 10.000 unique visitors in a matter of seconds.
We start with your values and check periodically with mod_status.
Thank's again
Missatge de Yann Ylavic <ylavic.dev@xxxxxxxxx> del dia dv., 18 de març
2022 a les 11:19:
>
> On Fri, Mar 18, 2022 at 8:27 AM Marc Serra <mserra@xxxxxxxxx> wrote:
> >
> > Thank's for your comments Frank,
> >
> > Reading the Apache documentation
> > (https://httpd.apache.org/docs/2.4/en/mod/mpm_common.html#threadlimit)
> > I cannot find the way to calculate an optimal value for ThreadLimit
> > and ThreadsPerChild directives for that reason I kept the default
> > values (64 and 25).
> >
> > Can you (or anyone) help me to find the right values?
>
> This script might help for an MPM event configuration based on
> MaxRequestWorkers:
> ```
> #!/bin/bash
>
> if [ $# -lt 1 ]; then
> echo>&2 "usage: `basename $0` <MaxRequestWorkers>"
> exit 1
> fi
>
> # Some pre-computations
> numWorkers=$1
> if [ $numWorkers -lt 1000 ]; then
> numProcesses=10
> elif [ $numWorkers -lt 10000 ]; then
> numProcesses=$(($numWorkers / 100))
> else
> numProcesses=100
> fi
> numThreads=$(($numWorkers / $numProcesses))
>
> cat <<EOF
> # MPM event settings
> StartServers 1
> ServerLimit $(($numProcesses * 3))
> ThreadLimit $numThreads
> ThreadsPerChild $numThreads
> MinSpareThreads $numThreads
> MaxSpareThreads $(($numWorkers / 2))
> MaxRequestWorkers $numWorkers
> #ThreadStackSize 524288
> MaxConnectionsPerChild 0
> EOF
> ```
>
> For a MaxRequestWorkers of 1500, it gives:
> # MPM event settings
> StartServers 1
> ServerLimit 45
> ThreadLimit 100
> ThreadsPerChild 100
> MinSpareThreads 100
> MaxSpareThreads 750
> MaxRequestWorkers 1500
> #ThreadStackSize 524288
> MaxConnectionsPerChild 0
>
> But you didn't describe your workload: static resources, dynamic
> content (local with mod_cgid or offloaded with mod_proxy_fcgi),
> proxying (HTTP, websocket), etc.
> Since your system looks quite capable (RAM/CPU), the limit for
> MaxRequestWorkers depends mainly on the average request time (bounded
> by timeouts) which you probably should measure for your workload.
>
>
> Regards;
> Yann.
>
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