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From "Sumit Gaikaiwari" <s.gaikaiw...@nihilent.com>
Subject RE: Tomcat Server CPU utilization goes upto 400%
Date Thu, 14 Jun 2007 11:15:25 GMT

Hi Doug,

The requirements of this application were as mentioned in the previous
mail. Can I have any work around on the issue? What things you tried
when you had same situation?

Regards,
Sumit Gaikaiwari


-----Original Message-----
From: PTS [mailto:parsonstechnical@gmail.com] 
Sent: Thursday, June 14, 2007 9:23 AM
To: Tomcat Users List
Subject: Re: Tomcat Server CPU utilization goes upto 400%

Sumit,

Look at the design of the app. Is each session doing a query every 30 
seconds? Also is the database on the same server?

I had an app that was originally designed to be for a few users that
each 
session hit the database. Due to the amount of processing of the data it
had 
a snowball effect that after more than a few users connected the system 
began to fall behind and the system came to a crawl. Since my query was
the 
same for all users, I was able to spawn a thread to do a query every few

minutes and cache the results, then each session grabbed a copy of the 
cached data from memory.

I would also have to agree that it appears to be an application issue, 
especially after experiencing it myself. Or more accurately doing it to 
myself.

Doug


----- Original Message ----- 
From: "Sumit Gaikaiwari" <s.gaikaiwari@nihilent.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Wednesday, June 13, 2007 11:17 PM
Subject: RE: Tomcat Server CPU utilization goes upto 400%





There is an application deployed that refreshes after every 30 seconds.
After every 30 seconds, it requeries database and fetches the data. This
was a design requirement for this application. Generally large numbers
of sessions of this application are running (450-500).

Regards,
Sumit Gaikaiwari


-----Original Message-----
From: Andre Prasetya [mailto:andre.prasetya@gmail.com]
Sent: Wednesday, June 13, 2007 4:22 PM
To: Tomcat Users List
Subject: Re: Tomcat Server CPU utilization goes upto 400%

i think its more to application problem instead of tomcat problem. Is
there
any application hosted inside tomcat that get infinite loop or use a
kind of
loop checking something that utilize the thread fully ? try solving that
with the application developer

On 6/13/07, Sumit Gaikaiwari <s.gaikaiwari@nihilent.com> wrote:
>
>
> Hello,
>
>
>
> We are using tomcat 5.0.25 on Red Hat Enterprise Linux server. There
two
> applications in webapps. We are facing an issue from around 3-4 months
> where the CPU utilization by java process (tomcat) goes quite high:
> around 400% in every 4-5 days. The application gets very slow and
tomcat
> needs to be restarted for normal operation. The output of top command
is
> as below-
>
>
>
> [root@v3portal2 jakarta-tomcat-5.0.25]# top
>
> Tasks:  78 total,   1 running,  77 sleeping,   0 stopped,   0 zombie
>
> Cpu(s): 25.1% us,  0.1% sy,  0.0% ni, 74.5% id,  0.2% wa,  0.0% hi,
> 0.0% si
>
> Mem:   4086472k total,  2487676k used,  1598796k free,   217464k
buffers
>
> Swap:  6094824k total,        0k used,  6094824k free,  1811576k
cached
>
>
>
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>
> 1038 root      16   0  545m 244m  61m S  101  6.1   1156:22 java
>
>     1 root      16   0  2556  552  472 S    0  0.0   0:01.17 init
>
>     2 root      RT   0     0    0    0 S    0  0.0   0:00.31
migration/0
>
>
>
>
>
> Here is the status of active threads-
>
> Thread Status-
>
>
>
> [root@v3portal2 jakarta-tomcat-5.0.25]# ps -Le -o
> pid,user,s,lwp,pcpu,args | awk '$3 != "S" { print }'
>
> 1038 root     R  1093 19.8 /usr/local/j2sdk1.4.2_12/bin/java -Xmx256m
> -Xms128m -Djava.awt.headless=true -Dsun.awt.font.advancecache=off
> -Djava.endorsed.dirs=/usr/local/jakarta-tomcat-5.0.25/common/endorsed
> -classpath
>
/usr/local/j2sdk1.4.2_12/lib/tools.jar:/usr/local/jakarta-tomcat-5.0.25/
>
bin/bootstrap.jar:/usr/local/jakarta-tomcat-5.0.25/bin/commons-logging-a
> pi.jar -Dcatalina.base=/usr/local/jakarta-tomcat-5.0.25
> -Dcatalina.home=/usr/local/jakarta-tomcat-5.0.25
> -Djava.io.tmpdir=/usr/local/jakarta-tomcat-5.0.25/temp
> org.apache.catalina.startup.Bootstrap start
>
> 20544 root     R 20544  0.0 ps -Le -o pid,user,s,lwp,pcpu,args
>
>
>
> This was status at certain instant of time. After 5 hours from this
> instant, the utilization reached to 400% and also there were many
> threads which were using almost 150% of CPU time.
>
>
>
> The system configuration is -
>
>
>
> [root@v3portal2 ~]# wget --quiet -O - --user admin --password nimda
> http://localhost:8080/manager/serverinfo
>
> OK - Server info
>
> Tomcat Version: Apache Tomcat/5.0.25
>
> OS Name: Linux
>
> OS Version: 2.6.9-42.0.2.ELsmp
>
> OS Architecture: i386
>
> JVM Version: 1.4.2_12-b03
>
> JVM Vendor: Sun Microsystems Inc.
>
>
>
> Please can any one tell me possible cause for this issue? This issue
has
> become very critical and needs to be fixed out soon.
>
>
>
> Regards,
>
> Sumit Gaikaiwari
>
>
>
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************************************************************************
*-




-- 
-Andre-

People see things the way they are and say "why ?" I see things that
never
were and say "Why not ?"

            -**************Nihilent***************

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" *** All information contained in this communication is confidential, proprietary, privileged
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notify mail administrator by telephone on +91-20-39846100 or E-mail the sender by replying
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Any unauthorized dissemination, publication, transfer or use of the contents of this communication,
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