Re: Tomcat Server CPU utilization goes upto 400%
It's an acronym for "As Far As I Know". D 吴熊敏 wrote: > “AFAIK” What it mean? > > >> AFAIK 400% of zero is still zero :D >> - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat Server CPU utilization goes upto 400%
Yeah, that's right. The application server is having 4 CPU's and top gives collective output for all the CPU's. Hence 400%... :) Regards, Sumit Gaikaiwari -Original Message- From: David Delbecq [mailto:[EMAIL PROTECTED] Sent: Friday, June 15, 2007 1:01 PM To: Tomcat Users List Subject: Re: Tomcat Server CPU utilization goes upto 400% That probably means that 4 CPUs/Cores are busy 100% time working for tomcat. This mean the issue appears in several Threads, leading to think it's webapps related issues :) Garbage collector issue wouldn't use 4 or more Threads. En l'instant précis du 15/06/07 09:17, 吴熊敏 s'exprimait en ces termes: > 400%? what do you mean?? > > > On Thu, 14 Jun 2007 21:14:45 +0200 > Filip Hanik - Dev Lists <[EMAIL PROTECTED]> wrote: > > >> man, I need to get a CPU like that, that can actually work 4 times its >> max capacity :) >> >> Filip >> > > > 吴熊敏 <[EMAIL PROTECTED]> > > > - > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -**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. *** " *- - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat Server CPU utilization goes upto 400%
I think I have one if you'd like it... Only problem is, it doesn't work :( AFAIK 400% of zero is still zero :D R On Thu, 2007-06-14 at 21:14 +0200, Filip Hanik - Dev Lists wrote: > man, I need to get a CPU like that, that can actually work 4 times its > max capacity :) > > Filip > > - > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat Server CPU utilization goes upto 400%
That probably means that 4 CPUs/Cores are busy 100% time working for tomcat. This mean the issue appears in several Threads, leading to think it's webapps related issues :) Garbage collector issue wouldn't use 4 or more Threads. En l'instant précis du 15/06/07 09:17, 吴熊敏 s'exprimait en ces termes: > 400%? what do you mean?? > > > On Thu, 14 Jun 2007 21:14:45 +0200 > Filip Hanik - Dev Lists <[EMAIL PROTECTED]> wrote: > > >> man, I need to get a CPU like that, that can actually work 4 times its >> max capacity :) >> >> Filip >> > > > 吴熊敏 <[EMAIL PROTECTED]> > > > - > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat Server CPU utilization goes upto 400%
rofl -Original Message- From: Filip Hanik - Dev Lists [mailto:[EMAIL PROTECTED] Sent: Thursday, June 14, 2007 12:15 PM To: Tomcat Users List Subject: Re: Tomcat Server CPU utilization goes upto 400% man, I need to get a CPU like that, that can actually work 4 times its max capacity :) Filip - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat Server CPU utilization goes upto 400%
man, I need to get a CPU like that, that can actually work 4 times its max capacity :) Filip - To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat Server CPU utilization goes upto 400%
Hi Doug,
The requirements of this application were as mentioned in the previous
mail. Can I have any work around on the issue? What things you tried
when you had same situation?
Regards,
Sumit Gaikaiwari
-Original Message-
From: PTS [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 14, 2007 9:23 AM
To: Tomcat Users List
Subject: Re: Tomcat Server CPU utilization goes upto 400%
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"
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 %MEMTIME+ COMMAND
>
> 1038 root 16 0 545m 244m 61m S 101 6.1 1156:22 java
>
> 1 root 16 0 2556 552 472 S0 0.0 0:01.17 init
>
> 2 root RT 0 000 S0 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
Re: Tomcat Server CPU utilization goes upto 400%
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"
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 %MEMTIME+ COMMAND
1038 root 16 0 545m 244m 61m S 101 6.1 1156:22 java
1 root 16 0 2556 552 472 S0 0.0 0:01.17 init
2 root RT 0 000 S0 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
-**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
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 %MEMTIME+ COMMAND
>
> 1038 root 16 0 545m 244m 61m S 101 6.1 1156:22 java
>
> 1 root 16 0 2556 552 472 S0 0.0 0:01.17 init
>
> 2 root RT 0 000 S0 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
>
>
>
> -**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%
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 %MEMTIME+ COMMAND
1038 root 16 0 545m 244m 61m S 101 6.1 1156:22 java
1 root 16 0 2556 552 472 S0 0.0 0:01.17 init
2 root RT 0 000 S0 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
-**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%
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 %MEMTIME+ COMMAND
1038 root 16 0 545m 244m 61m S 101 6.1 1156:22 java
1 root 16 0 2556 552 472 S0 0.0 0:01.17 init
2 root RT 0 000 S0 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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