Hi,

there are 25 websites running on our server, Unluckily one site uses too much memory,
normally our server consume Approximate 15% memory but when i switch ON this site, memory uses jump to more then 80%
some time it hangs the server. i still can't find which process in this site actually taking such a huge memory usage.
How can i check which process consume huge amount of memory to resolve this issue ?
following are the some output that i capture from some commands,

outpput from capture command:
[root@L8 ~]# top

top - 01:25:27 up 6 days, 17:28, 2 users, load average: 2.15, 2.87, 2.89
Tasks: 266 total, 1 running, 260 sleeping, 0 stopped, 5 zombie
Cpu(s): 14.3%us, 42.0%sy, 0.0%ni, 42.2%id, 1.4%wa, 0.0%hi, 0.1%si, 0.0%st
Mem: 8173984k total, 6803796k used, 1370188k free, 19408k buffers
Swap: 2096472k total, 144k used, 2096328k free, 84456k cached

[root@L8 ~]# sar -r 1 15

03:43:31 AM kbmemfree kbmemused %memused kbbuffers kbcached kbswpfree kbswpused %swpused kbswpcad
03:43:32 AM 484996 7688988 94.07 34136 221336 2096328 144 0.01 24
03:43:33 AM 484096 7689888 94.08 34172 222180 2096328 144 0.01 24
03:43:34 AM 483264 7690720 94.09 34172 222972 2096328 144 0.01 24
03:43:35 AM 482424 7691560 94.10 34172 223632 2096328 144 0.01 24
03:43:36 AM 481644 7692340 94.11 34180 224428 2096328 144 0.01 24
03:43:37 AM 480744 7693240 94.12 34180 225528 2096328 144 0.01 24
03:43:38 AM 479904 7694080 94.13 34216 226324 2096328 144 0.01 24



following are the amount of processes and amount of threads defined in apache configuration

<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 256
MaxClients 256
MaxRequestsPerChild 500
</IfModule>
<IfModule worker.c>
StartServers 2
MaxClients 12
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>


how can i resolve this issue ?

What's different about this one website? Does it get considerably more traffic? Does it use PHP / MySQL resources? You may simply have a website that is too "big" for that server.

yes it's a PHP website, also use mysql..... this website use approximate 5-6 GB bandwidth per day....

Well as you don't say what the specs are of your initial server I'm guessing that it's under-powered for that website.

Red Hat Enterprise Linux Server release 5.6
Memory 8 GB, Swap 2 GB,
CPU Model name : CPU Intel(R) Xeon(R) CPU L5335 @ 2.00GHz
PHP 5.2.17,
Mysql Server version: 5.0.77 Source distribution

Ok, so it's a quad-core based on a 2007 processor, I was doing well over 60,000 page displays a day on something older.

Are the performance stats you gave with or without this site running?

The thing that looks odd is the 42.0%sy in your top output. Normally I'd expect a much lower value than 42%.

Well the mem use is o, in as much as (in *nix) RAM is there to be used, otherwise its wasted money.
Note that its using almost no swap, so I don't think you've got a mem leak, just a large-ish site.
The 42% sys usage is interesting though.
Does this site do a lot of disk writing; what does top look like for the processes?
You can check what the DB is doing using 'show processlist' https://dev.mysql.com/doc/refman/5.1...ocesslist.html