Firstly, you are only making 350M of your memory available to the
application. xmx=350m means 350 megabtyes is reserved for the heap.
Secondly, that's probably not the issue!
You are correct in that you are running a 32 bit JVM. That's probably
not the issue either but it means that most of the 6GB of RAM you said
you had is not actually relevant.
Next. you keep saying that you are using netstat to look at your system.
but the display below is that of 'top'. I'm not familiar with your Unix
version so maybe netstat is different on your system. Neither netstat
nor top are that much use for delving into linux memory issues, never
mind about java issues. It is extremely difficult to correlate the way
that linux uses memory to what is actually happening inside the JVM.
The next issue is that thousands of people all over the world use tomcat
and don't suffer from the problem that you are seeing, so it is most
likely that the problem is with your application. I notice that you have
535 process listed - that's an awful lot.
You need to investigate what is actually happening inside the
application - the best way of doing that is to use either jconsole or a
profiling tool. You are using java 6 which means that you can easily set
up a jconsole session to display what is happening. If you use jconsole
you will be able to check the real JVM memory usage over time and force
a GC to see how much of that memory is actually held by a strong reference.
And of course what do the log files show? Are you getting out of memory
errors? Are you getting RTEs?
Another thing to check is that is the system swapping? I notice that in
the statistics below you don't show the swap usage. This is often a trap
for the unwary.
HTH
karthikn wrote:
Hi
>> is running a 64bit JVM.
JDK used is 32 bit probably by running java -version on this Unix 11
server
bash-3.2# ./java -version
java version "1.6.0.00"
Java(TM) SE Runtime Environment (build
1.6.0.00-jinteg_12_nov_2007_21_58-b00)
Java HotSpot(TM) Server VM (build 1.6.0.00 jinteg:11.12.07-21:02 PA2.0
(aCC_AP), mixed mode)
This version is avaliable from HP Unix site
http://h18012.www1.hp.com/java/
As per HP site 64 bit is the version HP is distributing
I also have some more netstats report for last 4 hrs before we did the
restart of the web container ( TOMCAT 5523)
Tue Mar 25 15:52:06 2008
System: voise1 Load averages:
1.45, 2.23, 2.28
535 processes: 509 sleeping, 25 running, 1 zombie
Cpu states:
CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS
0 1.23 2.0% 0.0% 6.9% 91.2% 0.0% 0.0% 0.0% 0.0%
1 1.66 6.8% 0.0% 3.9% 89.3% 0.0% 0.0% 0.0% 0.0%
--- ---- ----- ----- ----- ----- ----- ----- ----- -----
avg 1.45 4.9% 0.0% 4.9% 90.3% 0.0% 0.0% 0.0% 0.0%
Memory: 3894732K (1548140K) real, 7334992K (3049776K) virtual, 829420K
free Page# 1/36
CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %
WCPU% CPU COMMAND
0 pts/3 16406 root 152 20 2412M 1218M run 103:21
31.77 31.72 java
1 ? 12779 root 152 24 282M 163M run
2:27 9.90 9.88 xas
1 pts/4 8251 root 178 20 11608K 9628K run
0:02 1.12 1.12 top
1 ? 12733 root 152 24 79064K 29540K run
3:28 1.06 1.05 voiseBLG
0 ? 37 root 152 20 8832K 8832K run
3:44 0.55 0.55 vxfsd
Over a period of 12 hrs the RES STAT reaches 2000M when CPU for java is
100%
The web application refuses to display the main page,even though we have
the GC configured
as
"JAVA_OPTS=-server -Xms350m -Xmx350m -XX:+UseParallelGC -verbose:gc"
with regards
Karthik
sterling wrote:
I am sorry, if this is the wrong list, for submitting questions
about apache on linux and router issues.
This problem generated from alcatel to zoom x6 router change.
Traceroute to webpage reports router address, but
webserver is at machine address on the same routed network.
Cannot see webpages on browser from outside or inside.
Thanks.
s.
list, On Mon, 24 Mar 2008, Alan Chaney wrote:
| yes We have used -Xms or -Xmx Configuration , since the system
RAM is
| 6 GB
| as
|
| "JAVA_OPTS=-server -Xms350m -Xmx350m -XX:+UseParallelGC -verbose:gc"
So you have a 3.5GB heap. What are you filling it with? It's probably
not a memory issue if...
Actually the OP's heap appears to be 350M not 3.5G . I'm still wondering
what he does with the other 5 gigs. Also its not clear whether or not he
is running a 64bit JVM.
Alan
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