I am replying once again, as I thought I need more help on these.
top - 15:49:32 up 2 days, 21:33, 1 user, load average: 0.26, 0.28, 0.20
Tasks: 57 total, 2 running, 55 sleeping, 0 stopped, 0 zombie
Cpu(s): 4.5%us, 0.5%sy, 0.0%ni, 94.5%id, 0.0%wa, 0.0%hi, 0.5%si,
0.0%st
Mem: 2074972k total, 2019180k used, 55792k free, 228732k buffers
Swap: 6072528k total, 108k used, 6072420k free, 1383868k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12496 root 18 0 971m 285m 12m S 9 14.1 165:55.34 java
4423 mysql 15 0 129m 28m 5404 S 2 1.4 67:49.96 mysqld
1 root 18 0 2912 1848 524 S 0 0.1 0:01.44 init
2 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0
This is my machines top. I am using tomcat 6 and it has eaten all my memory.
Only 56 Mb reamains. I have a 2GB memory. I have added a connection pool
using commons-dbcp and thought that will reduce the probs. What is your
suggestion. As I told there is a scheduler running on every minute. Looks
like I have some memory leak. Otherwise why does my machine uses this memory
this much. I have an autobuild script running everyday which checkouts from
sourceforge cvs , stops the servers, build it and redeploy and start tomcat.
Yet , today I looked at my machine , and Ah ! here we goes.
I have not used any tweaks in xml.Should I tune the server to production
mode. What is the soultion ? Why does not the objects get garbage
colllected.?
On 10/11/07, Juha Laiho <[EMAIL PROTECTED]> wrote:
>
> Arun wrote:
> > That worked finally with the increase in PermGen space.
>
> > I am a bit concerned about my server memory.
> > See my top (not mine ofcourse)
> >
> > top - 09:38:18 up 9:16, 3 users, load average: 0.27, 0.18, 0.10
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 9770 root 25 0 491m 93m 35m R 102 4.6 0:13.64 java
> >
> > top - 09:38:33 up 9:16, 3 users, load average: 0.43, 0.22, 0.11
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 9770 root 25 0 504m 138m 35m R 100 6.8 0:28.66 java
> >
> > top - 09:38:42 up 9:16, 3 users, load average: 0.52, 0.25, 0.12
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 9770 root 25 0 512m 166m 31m R 100 8.2 0:37.63 java
> >
> > top - 09:39:03 up 9:17, 3 users, load average: 0.45, 0.25, 0.12
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 9770 root 25 0 529m 175m 31m S 96 8.7 0:41.00 java
> >
> > top - 09:39:21 up 9:17, 3 users, load average: 0.42, 0.25, 0.13
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 9770 root 25 0 561m 192m 31m S 9 9.5 0:47.93 java
> >
> >
> > See Mem: line and see the second one . It rises so fast . See at what
> rate.
>
> Well, look at the CPU consumption at the same period - so your Tomcat
> is working on something. Looking at the amount of CPU time consumed,
> it could even be still running the application startup (Tomcat by itself
> can take something like 20 seconds of pure CPU time, on some machine
> architectures at least -- and here the CPU time usage is running from
> 13 to 48 seconds - so it's still too early to say whether the rise
> in memory usage will continue or not).
>
> > What is this PermGen space. Why does not it get garbage collected.
>
> PermGen is the holding space for the program code in your currently
> active classes. So, looks like whatever you're using has quite a large
> active codebase.
>
> > Is there anyway I can tell tomcat to suggest the VM a garbage
> collection
> > more often than the default garbage collection algorithm does. Is there
> any
> > declerative way of doing, xml, .sh?
>
> Even PermGen is cleaned in current JVM versions -- but classes can only
> be unloaded when there's no reference to the class within the JVM.
> And garbage collection overall is done when needed: it is definitely
> done before JVM throws an out of memory error. There's quite a lot of
> tunables for the JVM (including garbage collection), but pretty much
> you should trust the defaults (unless you have experience to actually
> distrust the defaults because of some specific feature in your application
> or runtime environment).
> --
> ..Juha
>
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>
--
Thanks
Arun George
