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ps -ylC httpd --sort:rss | awk '{sum+=$8; ++n} END {print "Tot="sum"("n")";print "Avg="sum"/"n"="sum/n/1024"MB"}'
Tot=2762932(35)
Avg=2762932/35=77.0907MB
Tasks: 96 total, 9 running, 87 sleeping, 0 stopped, 0 zombie
Cpu(s): 82.1%us, 9.3%sy, 0.0%ni, 8.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 4194304k total, 4194304k used, 0k free, 0k buffers
Swap: 0k total, 0k used, 0k free, 0k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1852 mysql 15 0 5613m 1.1g 6336 S 63.2 27.7 57:31.20 mysqld
15508 apache 15 0 377m 91m 36m R 13.1 2.2 0:03.78 httpd
15608 root 16 0 266m 62m 9676 R 11.8 1.5 0:01.75 php
13955 apache 15 0 368m 86m 39m S 11.5 2.1 0:22.41 httpd
12051 apache 16 0 373m 94m 39m R 10.5 2.3 0:58.09 httpd
13947 apache 15 0 369m 91m 39m S 6.4 2.2 0:26.81 httpd
13967 apache 16 0 351m 72m 39m S 5.4 1.8 0:23.34 httpd
15517 apache 15 0 345m 62m 32m S 5.4 1.5 0:03.20 httpd
13527 apache 15 0 376m 96m 39m S 5.1 2.4 0:48.03 httpd
15620 root 15 0 218m 19m 8276 S 4.8 0.5 0:00.46 php
15457 apache 16 0 365m 82m 37m R 4.5 2.0 0:05.21 httpd
15514 apache 15 0 337m 54m 31m S 4.5 1.3 0:03.59 httpd
15518 apache 15 0 337m 48m 26m S 4.5 1.2 0:02.45 httpd
15461 apache 15 0 346m 64m 34m S 3.8 1.6 0:06.47 httpd
13944 apache 16 0 375m 94m 39m S 2.6 2.3 0:24.36 httpd
15456 apache 15 0 368m 84m 38m R 2.6 2.1 0:07.29 httpd
15365 apache 15 0 351m 71m 37m S 2.2 1.7 0:09.78 httpd
Timeout 45
KeepAlive Off
MaxKeepAliveRequests 256
KeepAliveTimeout 2
<IfModule prefork.c>
StartServers 5
MinSpareServers 5
MaxSpareServers 20
ServerLimit 192
MaxClients 192
MaxRequestsPerChild 3000
</IfModule>