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" <mserra@xxxxxxxxx> 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-differeI 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!
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