Hi Shapira,
I have actually increased the heap size on my server. Its a 4 CPU processor with 4 GB
Ram. So I increased my VM options when starting the tomcat to start with 128M and go
upto 1.24GB. I suppose thats pretty huge for that. The problem here is, it doesn't max
out the memory. When the tomcat stops responding, I check for the heap size and the
CPU processes. Both are normal. For example, these are the statistics what I have when
my CPU is actually hanging. Just have a look at them
The total memory occupied by the tomcat was 145 M of which
121M was resident. This is the top output
last pid: 5794; load averages: 0.16, 0.19, 0.26
20:43:38
45 processes: 44 sleeping, 1 on cpu
CPU states: 37.1% idle, 61.5% user, 1.4% kernel, 0.0% iowait, 0.0% swap
Memory: 512M real, 130M free, 299M swap in use, 1099M swap free
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
5370 gsatpath 21 59 0 130M 108M sleep 27:39 24.82% java
5521 tomcat 29 59 0 145M 121M sleep 14:28 2.95% java
5794 gsatpath 1 59 0 2584K 1696K cpu 0:00 0.09% top
429 root 12 58 0 2464K 2152K sleep 0:56 0.00% mibiisa
161 root 5 58 0 3216K 2272K sleep 0:27 0.00% automountd
5496 tomcat 9 59 0 96M 23M sleep 0:04 0.00% java
321 root 1 30 0 2984K 1640K sleep 0:03 0.00% sshd
153 root 1 0 0 2016K 1264K sleep 0:00 0.00% lockd
152 daemon 4 1 0 2520K 1824K sleep 0:00 0.00% statd
49 root 5 2 0 1344K 848K sleep 0:00 0.00% syseventconfd
47 root 9 12 0 1536K 1192K sleep 0:00 0.00% syseventd
366 root 5 23 0 3144K 2216K sleep 0:00 0.00% dmispd
226 root 5 31 0 2688K 2072K sleep 0:00 0.00% vold
5276 root 1 38 0 1816K 1448K sleep 0:00 0.00% in.telnetd
4510 root 1 39 0 1816K 1448K sleep 0:00 0.00% in.telnetd
Can any one let me know why tomcat can hang in such stage???
..Raj
--
On Thu, 13 Mar 2003 12:01:00
Shapira, Yoav wrote:
>
>Howdy,
>There is one heap per JVM, period. It has nothing to do with tomcat or
>web applications. You can tune this heap extensively using the various
>java runtime options: http://java.sun.com/docs/hotspot/VMOptions.html
>
>If it's an emergency and in production, just allocate more memory to the
>overall heap for now. But you should immediately start to profile your
>applications, identify any leaks, and fix them, all in a development
>environment.
>
>Yoav Shapira
>Millennium ChemInformatics
>
>
>>-----Original Message-----
>>From: Raja Sekhar [mailto:[EMAIL PROTECTED]
>>Sent: Thursday, March 13, 2003 11:18 AM
>>To: [EMAIL PROTECTED]
>>Subject: Increase heap for a specific webapplication
>>
>>Hi,
>>
>>I have two web applications running in my Tomcat 4.0.6. One application
>is
>>data centric and heavily loaded and other is very light with hardly any
>>users hitting. Now what I observe is sometimes if there is a heavy
>search
>>made on the first system... it basically stops responding. I cant send
>any
>>further requests till restart. But if I hit the second webapp, it still
>>keeps responding.
>>
>>So what I feel is tomcat is internally dividing the heap and virtual
>memory
>>for all the webapps equally.. Is there anyway I can alter this heap for
>>each webapp separately??
>>
>>Or please let me know any other alternative for this problem asap
>because
>>this is a production problem.
>>
>>Thanks & Regards,
>>
>>..Raj
>>
>>
>>Need a new email address that people can remember
>>Check out the new EudoraMail at
>>http://www.eudoramail.com
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