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Posted to users@tomcat.apache.org by Sumit Gaikaiwari <s....@nihilent.com> on 2007/06/13 09:05:02 UTC
Tomcat Server CPU utilization goes upto 400%
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
-**************Nihilent***************
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*************************************************************************-
Re: Tomcat Server CPU utilization goes upto 400%
Posted by Andre Prasetya <an...@gmail.com>.
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....@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
>
>
>
> -**************Nihilent***************
>
> " *** All information contained in this communication is confidential,
> proprietary, privileged and is intended for the addressees only. If you have
> received this E-mail in error please notify mail administrator by telephone
> on +91-20-39846100 or E-mail the sender by replying to this message, and
> then delete this E-mail and other copies of it from your computer system.
> Any unauthorized dissemination, publication, transfer or use of the contents
> of this communication, with or without modifications is punishable under the
> relevant law.
>
> Nihilent has scanned this mail with current virus checking technologies.
> However, Nihilent makes no representations or warranties to the effect that
> this communication is virus-free.
>
> Nihilent reserves the right to monitor all E-mail communications
> through its Corporate Network. *** "
>
> *************************************************************************-
--
-Andre-
People see things the way they are and say "why ?" I see things that never
were and say "Why not ?"
Re: Tomcat Server CPU utilization goes upto 400%
Posted by Tim Funk <fu...@joedog.org>.
This is an old version so you might be see'ing gc issues. (but that is a
wild guess).
There isn't enough detail to debug, but when the situation arises - do
the following - get thread dumps a look for "odd stuff"
1) kill -3 tomcat when tomcat is running OK - so you have a base line
2) Then when things are going bad kill -3 to get a stack trace of all
the threads and look for what is running and "out of the ordinary" -
typically you might need 2 or 3 dumps for a better comparision
3) When things get really slow - do a final stack trace (via kill -3)
before you restart tomcat. We luck this trace will confirm any theories
you saw in step 2.
Good luck.
-Tim
Sumit Gaikaiwari 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.
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