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7.8

Cannot locate server memory bog problem

Asked by the_hero in Linux, Apache Tomcat Application Server, Apache Web Server

Tags: apache, tomcat, linux

Our server keeps running out of memory. We cannot find the source of the memory hog. We have to reboot mulitple times a day. Often the images or different peices of the sites on the server don't display or timeout before displaying.

This is what I get if I enter free -m in my SSH client.

total used free shared buffers cached
Mem: 7949 7894 55 0 86 2093
-/+ buffers/cache: 5714 2235
Swap: 12284 3474 8809

This is what I get if I enter df -h in my SSH client.

Filesystem Size Used Avail Use% Mounted on
/dev/vzfs 10G 3.0G 7.1G 30% /

I have 10 gig of hard drive space on a virtual dedicated server.
My Base Bandwidth is 500 gb
I have 512 MB of RAM Guaranteed, 2GB Bursted
Operating Sytem is: Linux - CentOS 5
Bandwidth Usage: Allowed 500GB, Used 1GB

this is what I get if I enter top in my SSH client.

top - 14:49:03 up 12 min, 1 user, load average: 0.00, 0.02, 0.02
Tasks: 39 total, 2 running, 37 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1% us, 0.1% sy, 0.0% ni, 98.3% id, 1.5% wa, 0.0% hi, 0.0% si
Mem: 8140592k total, 8103408k used, 37184k free, 71136k buffers
Swap: 12578884k total, 3557504k used, 9021380k free, 1904244k cached

I need help locating the cause of my memory issues. I have one large Java application that sits on the tomcat. Outside of that I have several PHP scripts such as wordpress blogs and such that access the same database as the java ap does.

I should have plenty of memory for this type of server, but it bogs down easily and runs out of memory.

Let me know if you need any more information.

Get your answer NOW

         
           
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             Below is a bit some information that my programming consultant sent me in regards to the same problem.
 
I was able to get some interesting information about the server's memory conditions immediately before the "freezing" took 
place and immediately after the server was booted (before Tomcat was even started).  I have attached it as a txt file because 
if I just copy and paste the info, it doesn't line-up in the correct columns.  If you take a look, our memory state is almost 
exactly the same before and after.  The issues with the server are memory related, but it doesn't look like they have anything 
to do with the web application.
 
 
Seconds before the server started denying malloc requests:
 
[]# free -m
             total       used       free     shared    buffers     cached
Mem:          7949       7913         36          0         72       1926
-/+ buffers/cache:       5914       2035
Swap:        12284       2945       9338
 
[]# top
top - 11:07:14 up  1:02,  1 user,  load average: 0.05, 0.02, 0.00
Tasks:  45 total,   1 running,  44 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   8140592k total,  8117700k used,    22892k free,    74380k buffers
Swap: 12578884k total,  3015980k used,  9562904k free,  1914280k cached
 
 
 
Seconds after the server came back up from a power cycle (before Tomcat was running):
 
[ ~]$ free -m
             total       used       free     shared    buffers     cached
Mem:          7949       7920         29          0         78       2211
-/+ buffers/cache:       5630       2319
Swap:        12284       2945       9338
 
[ ~]$ top
top - 11:26:00 up 1 min,  1 user,  load average: 0.03, 0.01, 0.00
Tasks:  33 total,   1 running,  32 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0% us,  0.0% sy,  0.0% ni, 100.0% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   8140592k total,  8118076k used,    22516k free,    80788k buffers
Swap: 12578884k total,  3015948k used,  9562936k free,  2277184k cached
           
         

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Cannot locate server memory bog problem

Asked by the_hero in Linux, Apache Tomcat Application Server, Apache Web Server

Tags: apache, tomcat, linux

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