Wow! The memory eater was security2 ... With the module enabled (120-160MB per process) ... # ps axo 'user rss cmd' | grep apache | grep -v "\(root\|grep\|tomcat\)" www-data 121232 /usr/sbin/apache2 -k start www-data 120596 /usr/sbin/apache2 -k start www-data 156816 /usr/sbin/apache2 -k start www-data 162668 /usr/sbin/apache2 -k start
With the module disabled (9-15MB per process) ... # a2dismod security2 Module security2 disabled. To activate the new configuration, you need to run: systemctl restart apache2 # systemctl restart apache2 # ps axo 'user rss cmd' | grep apache | grep -v "\(root\|grep\|tomcat\)" www-data 10340 /usr/sbin/apache2 -k start www-data 9764 /usr/sbin/apache2 -k start www-data 14164 /usr/sbin/apache2 -k start www-data 14220 /usr/sbin/apache2 -k start Thank's for your answer Dino. That's enough for me. I didn’t really think a module would cause this change in memory usage, which is why I haven’t dedicated myself to disabling them one by one. But I was clearly wrong. Thank you again. For your information, my problem was understand why so much difference between to systems because I want to optimize some parameters like: ServerLimit, StartServers, MinSpareServers, MaxSpareServers, MaxClients and MaxRequestsPerChild I need to know the memory used per each Apache process to find the MaxClients value. Missatge de Dino Ciuffetti <d...@tuxweb.it> del dia dl., 17 de maig 2021 a les 14:54: > > 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> wrote: > > 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 > > Manxa Ferros | Coneix més aquí > > Manxa Ferreteria i Parament de la Llar | Coneix més aquí > > 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. Imprimir este correo solo si es necesario. > > The content of this email and its attachments is strictly confidential. If you are not the recipient and you have received this message by mistake, please notify the sender and proceed to its elimination, without spreading, storing or copying its content. Print this email only if necessary. > > Le contenu de cet e-mail et de ses pièces jointes est strictement confidentiel. Dans le cas où vous n'êtes pas le destinataire et avez reçu ce message par erreur, veuillez en informer l'expéditeur et procéder à sa suppression, sans diffuser, stocker ou copier son contenu. Imprimez cet e-mail uniquement si nécessaire. > > > -- Marc Serra Organització i Sistemes -- 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. Imprimir este correo solo si es necesario. The content of this email and its attachments is strictly confidential. If you are not the recipient and you have received this message by mistake, please notify the sender and proceed to its elimination, without spreading, storing or copying its content. Print this email only if necessary. Le contenu de cet e-mail et de ses pièces jointes est strictement confidentiel. Dans le cas où vous n'êtes pas le destinataire et avez reçu ce message par erreur, veuillez en informer l'expéditeur et procéder à sa suppression, sans diffuser, stocker ou copier son contenu. Imprimez cet e-mail uniquement si nécessaire.
