Hi Martin, 2017-08-17 17:40 GMT+02:00 Martin Knoblauch <kn...@knobisoft.de>:
> Hi, > > this is for httpd-2.4.26 with the mpm_worker_module. I have one practical > and one more theoretical question. > > First, is there a way to determine the maximum number of concurrent > requests that have been processed at any time since the last server > (re)start? > I would periodically poll https://httpd.apache.org/docs/2.4/mod/mod_status.html and push metrics to a backend like graphite/prometheus/etc. > > Second, if I have the default configuration and I ever want to increase > MaxRequestWorkers above 400 my understanding is that I need to either > increase ServerLimit or ThreadsPerChild (or adjust both). Which should I > touch first (why :-)? > >From https://httpd.apache.org/docs/2.4/mod/worker.html: "ServerLimit is a hard limit on the number of active child processes, and must be greater than or equal to the MaxRequestWorkers directive divided by the ThreadsPerChild directive." Basically mpm_worker creates some processes (maximum ServerLimit) that in turn spawn ThreadsPerChild threads each, so you need to tune them to reach MaxRequestWorkers. Hope that helps :) Luca
