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" <[EMAIL PROTECTED]>
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:[EMAIL PROTECTED]
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 <[EMAIL PROTECTED]> 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.
Regards,
Sumit Gaikaiwari
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