We upgraded from httpd 2.4.23 to 2.4.32 . After upgrade, we noticed mpm module got changed from preforx to event in 2.4.23
$ /apps/httpd.2.4.23/bin/httpd -M | grep mpm
mpm_prefork_module (static
$ /apps/httpd-2.4.34/bin/httpd -M | grep mpm
mpm_event_module (static)
But the memory utilization is too high when used with wordpress sites for event module . OOM are getting invoked because of high memory utilization
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
25624 apachewp 20 0 3285m 1.1g 72m S 0.0 6.9 1:30.64 httpd
25487 apachewp 20 0 3278m 1.1g 65m S 0.0 6.8 2:36.70 httpd
25549 apachewp 20 0 3230m 1.0g 86m S 0.0 6.7 5:22.49 httpd
25568 apachewp 20 0 3284m 1.0g 61m S 0.0 6.6 0:40.90 httpd
25489 apachewp 20 0 3182m 1.0g 101m S 21.2 6.6 13:12.10 httpd
25586 apachewp 20 0 3236m 1.0g 80m S 0.0 6.6 1:59.98 httpd
25603 apachewp 20 0 3126m 989m 101m S 0.0 6.2 8:51.16 httpd
25639 apachewp 20 0 3198m 975m 63m S 0.0 6.1 0:50.38 httpd
25614 apachewp 20 0 3158m 956m 69m S 0.0 6.0 0:41.13 httpd
25650 apachewp 20 0 3098m 889m 64m S 0.0 5.6 1:13.60 httpd
25515 apachewp 20 0 3046m 868m 75m S 0.0 5.4 4:05.48 httpd
25538 apachewp 20 0 3057m 831m 51m S 0.0 5.2 0:26.23 httpd
25530 apachewp 20 0 2933m 704m 53m S 0.0 4.4 0:19.28 httpd
25485 apachewp 20 0 2777m 548m 48m S 0.0 3.4 0:11.02 httpd
25497 apachewp 20 0 2757m 498m 45m S 0.0 3.1 0:11.90 httpd
25486 apachewp 20 0 2600m 372m 51m S 0.0 2.3 0:07.74 httpd
24866 apache 20 0 2462m 91m 18m S 0.3 0.6 0:01.87 httpd
24924 apache 20 0 2369m 80m 8436 S 0.0 0.5 0:02.98 httpd
24952 apache 20 0 2368m 80m 6476 S 0.0 0.5 0:01.30 httpd
Following is our event reading
<IfModule mpm_event_module>
StartServers 15
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestWorkers 100
MaxConnectionsPerChild 0
Memory utlization was not so high when used with prefork module but it increased with event module . PHP version is 7.2 . Please suggest workarounds to reduce the memory footprint.
