Hi, On Mon, May 17, 2021 at 1:34 PM Marc Serra <mserra@xxxxxxxxx> wrote: > > I have a pair of Ubuntu dedicated servers... > > Server1: > Ubuntu 16.04.7 (64 bits) > 16GB RAM > 8 Xeon CPU > Apache 2.4.18 > MPM mode: prefork > > Server2: > Ubuntu server 20.04.2 (64 bits) > 32GB RAM > 8 Xeon CPU > 2.4.41 > MPM mode: event MPM prefork is single threaded, while MPM event uses multiple threads, and each thread "consumes" 8MB of rss (for its stack) on a typical linux system. The default thread stack size can be changed with "ulimit -s" (or LimitSTACK= on systemd), depending on the loaded modules and their stack "consumption". I usually run httpd with "ulimit -s 512" (KB) without issues, but this needs testing in your environment (i.e. no crash).. Regards; Yann. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
|