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-
[EMAIL PROTECTED] 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-
[EMAIL PROTECTED] 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 -
[EMAIL PROTECTED] ~]# 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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