tomcat-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Sumit Gaikaiwari" <>
Subject Tomcat Server CPU utilization goes upto 400%
Date Wed, 13 Jun 2007 07:05:02 GMT



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



 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
pi.jar -Dcatalina.base=/usr/local/jakarta-tomcat-5.0.25
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

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.



Sumit Gaikaiwari


" *** 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.
*** "

  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message