Hi to all, I already posted this question to 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
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. 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