Try to comment out mod_security, it's a module that use enough memory. Also on server2 there are modules not loaded on server1. BTW what's your problem? Your server is plenty of ram and RSS memory is not creating any problem. Right? 17 maggio 2021 13:34, "Marc Serra" <mse...@manxa.com (mailto:mse...@manxa.com?to=%22Marc%20Serra%22%20<mse...@manxa.com>)> wrote: Hi to all,
I already posted this question to stackoverflow.com (http://stackoverflow.com) but no answer after 9 days: https://stackoverflow.com/questions/67439771/why-so-much-difference-in-memory-used-per-process-in-apache2-between-two-differe (https://stackoverflow.com/questions/67439771/why-so-much-difference-in-memory-used-per-process-in-apache2-between-two-differe) I hope the apache gurus in this list can help me :) 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 On Server1, each apache2 process uses between 7MB and 18MB of RAM ... # ps axo 'user rss cmd' | grep apache | grep -v "(root|grep|tomcat)" www-data 18232 /usr/sbin/apache2 -k start www-data 11700 /usr/sbin/apache2 -k start www-data 11276 /usr/sbin/apache2 -k start www-data 10792 /usr/sbin/apache2 -k start www-data 11216 /usr/sbin/apache2 -k start www-data 11600 /usr/sbin/apache2 -k start www-data 10336 /usr/sbin/apache2 -k start www-data 11356 /usr/sbin/apache2 -k start www-data 11348 /usr/sbin/apache2 -k start www-data 10980 /usr/sbin/apache2 -k start www-data 11316 /usr/sbin/apache2 -k start www-data 6808 /usr/sbin/apache2 -k start On Server2, each apache2 process uses between 120MB and 130MB of RAM ... # ps axo 'user rss cmd' | grep apache | grep -v "(root|grep|tomcat)" www-data 120436 /usr/sbin/apache2 -k start www-data 119784 /usr/sbin/apache2 -k start www-data 128720 /usr/sbin/apache2 -k start www-data 130208 /usr/sbin/apache2 -k start Why so much difference in memory used? After read a few documentation and googleing, I thought about loaded modules, but there are not a lot of difference between each server... Server1 # apache2 -M Loaded Modules: core_module (static) so_module (static) watchdog_module (static) http_module (static) log_config_module (static) logio_module (static) version_module (static) unixd_module (static) access_compat_module (shared) actions_module (shared) alias_module (shared) auth_basic_module (shared) auth_digest_module (shared) auth_openidc_module (shared) authn_core_module (shared) authn_file_module (shared) authz_core_module (shared) authz_host_module (shared) authz_user_module (shared) autoindex_module (shared) bw_module (shared) cgi_module (shared) dav_module (shared) dav_fs_module (shared) dav_lock_module (shared) deflate_module (shared) dir_module (shared) env_module (shared) expires_module (shared) fcgid_module (shared) filter_module (shared) headers_module (shared) include_module (shared) mime_module (shared) mpm_prefork_module (shared) negotiation_module (shared) proxy_module (shared) proxy_balancer_module (shared) proxy_fcgi_module (shared) proxy_http_module (shared) rewrite_module (shared) setenvif_module (shared) slotmem_shm_module (shared) socache_shmcb_module (shared) ssl_module (shared) status_module (shared) suexec_module (shared) userdir_module (shared) Server2 # apache2 -M Loaded Modules: core_module (static) so_module (static) watchdog_module (static) http_module (static) log_config_module (static) logio_module (static) version_module (static) unixd_module (static) access_compat_module (shared) aclr_module (shared) actions_module (shared) alias_module (shared) auth_basic_module (shared) auth_digest_module (shared) auth_openidc_module (shared) authn_core_module (shared) authn_file_module (shared) authz_core_module (shared) authz_host_module (shared) authz_user_module (shared) autoindex_module (shared) cgid_module (shared) dav_module (shared) dav_fs_module (shared) dav_lock_module (shared) deflate_module (shared) dir_module (shared) env_module (shared) fcgid_module (shared) filter_module (shared) headers_module (shared) include_module (shared) mime_module (shared) mpm_event_module (shared) negotiation_module (shared) proxy_module (shared) proxy_balancer_module (shared) proxy_fcgi_module (shared) proxy_http_module (shared) remoteip_module (shared) reqtimeout_module (shared) rewrite_module (shared) security2_module (shared) setenvif_module (shared) slotmem_shm_module (shared) socache_shmcb_module (shared) ssl_module (shared) status_module (shared) suexec_module (shared) unique_id_module (shared) userdir_module (shared) I already changed MPM mode from Event to Prefork on Server2, with the same results. What else can I check to understand this difference? Thank's! Manxa 1876, S.L. Ctra. Les Tries, 85. 17800 Olot (Girona) Tel. 972 27 45 30 Fax 972 27 45 32 Manxa Industrial | Coneix més aquí (http://www.manxaindustrial.com) Manxa Ferros | Coneix més aquí (http://www.manxaferros.com/) Manxa Ferreteria i Parament de la Llar | Coneix més aquí (https://www.manxabricolatge.com) El contingut d’aquest correu electrònic i els seus annexos és estrictament confidencial. En el cas que no siguis el destinatari i hagis rebut aquest missatge per error, preguem que ho comuniquis al remitent i procedeixis a la seva eliminació, sense difondre, emmagatzemar o copiar el seu contingut. Imprimeix aquest correu només si és necessari. El contenido de este correo electrónico y sus anexos es estrictamente confidencial. En el caso de que no seas el destinatario y hayas recibido este mensaje por error, rogamos lo comuniques al remitente y procedas a su eliminación, sin difundir, almacenar o copiar su contenido. 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