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From David Delbecq <delbd+jaka...@oma.be>
Subject Re: [OT] Tomcat Server CPU utilization goes upto 400%
Date Fri, 15 Jun 2007 07:28:39 GMT
Do as Tim Funk suggested, issue a kill -3 to tomcat when CPU usage gets
high to get an idea of what java Threads are currently doing. Issue a
few kills to get a better view of what part of process takes times. If
it's not enough to find the location of issue, you might want to invest
time in using a profiler to locate problem (attach profiler to running
jvm when it starts to consume CPU).

En l'instant précis du 14/06/07 05:17, Sumit Gaikaiwari s'exprimait en
ces termes:
>
> 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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