topic Re: Java consuming too much CPU resources in Operating System - HP-UX

Java consuming too much CPU resources

ManojK_1 — Sun, 27 Jul 2008 04:21:08 GMT

Hi Friends,

In my rx3600 server the cpu utilisation always showing more than 100%.

The main process which is consuming more CPU is "JAVA".Please find the attachment.

Server Configuration:
rx3600
CPU info: Number of CPUs = 4
Clock speed = 1595 MHz
Memory = 12257 MB (11.969727 GB)

PatchSet Details
QPKAPPS B.11.23.0706.064 Applications Quality Pack Bundle for HP-UX 11i v2, June 2007
QPKBASE B.11.23.0706.064 Base Quality Pack Bundle for HP-UX 11i v2, June 2007
HWEnable11i B.11.23.0706.064 Hardware Enablement Patches for HP-UX 11i v2, June 2007

wkt24u02#which java
/opt/java1.5/bin/java

There is any fine tune i have to do for JAVA?
Thanks in advance,
Manoj K

Re: Java consuming too much CPU resources

Steven Schweda — Sun, 27 Jul 2008 04:32:26 GMT

> [...] rx3600 [...]
> [...] B.11.23 [...]

You might try asking in an HP-UX forum,
instead of in this Tru64 forum.

> Please find the attachment.

This might be easier if you attached one.

Re: Java consuming too much CPU resources

Dennis Handly — Sun, 27 Jul 2008 05:07:53 GMT

(I've asked the moderators to move this to HP-UX > Languages.)

Have you tried glance or HPjmeter to check your performance?
http://www.hp.com/go/hpjmeter

Re: Java consuming too much CPU resources

Michael Steele_2 — Mon, 28 Jul 2008 00:18:51 GMT

Hi Manoj:

Can you paste in the report from these commands?

UNIX95=1 ps -e -o vsz,rss,sz,pid,ppid,comm | sort -rna | head

UNIX95=1 ps -e -o cpu,pcpu,state,pid,ppid,comm | sort -rna | head

Re: Java consuming too much CPU resources

Bill Hassell — Mon, 28 Jul 2008 01:07:26 GMT

I think you will find that this is a very common situation for Java. Java is very convenient in many ways but it also allows terribly inefficient code to be created if the programmer is not careful. The usage more than 100% is an artifact when a program spawns many threads. Your programmer will have to fix the problems. Use the HP Java website as a starting point:

http;//www.hp.com/go/java

Re: Java consuming too much CPU resources

Steven E. Protter — Mon, 28 Jul 2008 08:18:16 GMT

Shalom,

This is either Java or the app.

Or both.

Find the leak, then act:

http://www.hpux.ws/?p=8

SEP

Re: Java consuming too much CPU resources

ManojK_1 — Mon, 28 Jul 2008 11:20:44 GMT

Hi Dennis,

I have used hpjmeter for monitoring java, The cpu usage and Java Method hotspot output is there in the attached file (1)

Hi Michael,

System is not accepting sopme options from the given command eg:- rss & a (sort -rna)
So i have run the commands as follows and the output is there in the attached file.
UNIX95=1 ps -e -o vsz,sz,pid,ppid,comm | sort -rn | head
UNIX95=1 ps -e -o cpu,pcpu,state,pid,ppid,comm | sort -rn | head

Hi Steven,
This is an application called TCServer (Temenos core banking service) which is using java.
I am not having any problem with memory, but the bottleneck is there with cpu.

Thanks & waiting for the reply,
Manoj K

Re: Java consuming too much CPU resources

ManojK_1 — Mon, 28 Jul 2008 11:22:31 GMT

Sorry Friends,

Forgotten to attach the attachment. Please find it here.

Re: Java consuming too much CPU resources

Dennis Handly — Mon, 28 Jul 2008 12:03:43 GMT

>Please find it here.

Basically top has:
119.35% in java and steady, using 840 Mb. jpqn is also using a lot.
HPjmeter says you are spending 89% of your time in Util.splitV.
So you need to talk to the developers.

Re: Java consuming too much CPU resources

James R. Ferguson — Mon, 28 Jul 2008 12:12:09 GMT

Hi:

Have you considered analyzing what the *application* code is doing?

Regards!

...JRF...

Re: Java consuming too much CPU resources

Michael Steele_2 — Mon, 28 Jul 2008 14:10:00 GMT

Here's your biggest memory and cpu consumer :

Virtual Memory

vsz,sz,state,pid,ppid,comm | sort -rn | head

244740 61067 15809 15807 jpqn

pid = 15809
ppid = 15807

CPU

UNIX95=1 ps -e -o cpu,pcpu,state,pid,ppid,comm | sort -rn | head
255 71.21 R 15809 15807 jpqn

pid = 15809
ppid = 15807

Rerun and paste this command.

UNIX95=1 ps -e -o vsz,sz,state,pid,ppid,comm | sort -rn | head

Re: Java consuming too much CPU resources

ManojK_1 — Wed, 30 Jul 2008 06:16:29 GMT

Hi Michel,

In the system my main concern is cpu usage. For that i have used the following command and the output is attached with this mail.

UNIX95=1 ps -e -o pid,ppid,cpu,pcpu,vsz,sz,comm | sort -rnk4 |more

I have also run the command as you mentioned and the output is also there in the attachment.

Re: Java consuming too much CPU resources

Michael Steele_2 — Wed, 30 Jul 2008 14:16:48 GMT

Hi Manoj:

You've got a memory leak problem with pid 15809.

wkt24u02#UNIX95=1 ps -e -o vsz,sz,state,pid,ppid,comm | sort -rn | head
1530884 382591 R 15809 15807 jpqn
177264 26840 R 11167 1 java
70844 12042 R 25883 1 java

If you compare the vsz consumption in the first attachement you'll a huge growth. This jave application is not releasing memory. It needs to go back to the programmers.

Re: Java consuming too much CPU resources

ManojK_1 — Sun, 03 Aug 2008 05:03:06 GMT

Thanks to all for helping me to get some idea.

I have raised this issue with our application team and they were checking it in CODE level, so i am closing this thread.

Thanks again.

Manoj K