Re: Increase heap for a specific webapplication

Thu, 13 Mar 2003 22:18:53 -0800

Is there any chance that there is a bottle neck in one of your apps ?

Raja Sekhar wrote:

Hi Shapira,

I have actually increased the heap size on my server. Its a 4 CPU processor with 4 GB Ram. So I increased my VM options when starting the tomcat to start with 128M and go upto 1.24GB. I suppose thats pretty huge for that. The problem here is, it doesn't max out the memory. When the tomcat stops responding, I check for the heap size and the CPU processes. Both are normal. For example, these are the statistics what I have when my CPU is actually hanging. Just have a look at them

The total memory occupied by the tomcat was 145 M of which
121M was resident. This is the top output

last pid:  5794;  load averages:  0.16,  0.19,  0.26
20:43:38
45 processes:  44 sleeping, 1 on cpu
CPU states: 37.1% idle, 61.5% user,  1.4% kernel,  0.0% iowait,  0.0% swap
Memory: 512M real, 130M free, 299M swap in use, 1099M swap free

  PID USERNAME THR PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
 5370 gsatpath  21  59    0  130M  108M sleep   27:39 24.82% java
 5521 tomcat    29  59    0  145M  121M sleep   14:28  2.95% java
 5794 gsatpath   1  59    0 2584K 1696K cpu      0:00  0.09% top
  429 root      12  58    0 2464K 2152K sleep    0:56  0.00% mibiisa
  161 root       5  58    0 3216K 2272K sleep    0:27  0.00% automountd
 5496 tomcat     9  59    0   96M   23M sleep    0:04  0.00% java
  321 root       1  30    0 2984K 1640K sleep    0:03  0.00% sshd
  153 root       1   0    0 2016K 1264K sleep    0:00  0.00% lockd
  152 daemon     4   1    0 2520K 1824K sleep    0:00  0.00% statd
   49 root       5   2    0 1344K  848K sleep    0:00  0.00% syseventconfd
   47 root       9  12    0 1536K 1192K sleep    0:00  0.00% syseventd
  366 root       5  23    0 3144K 2216K sleep    0:00  0.00% dmispd
  226 root       5  31    0 2688K 2072K sleep    0:00  0.00% vold
 5276 root       1  38    0 1816K 1448K sleep    0:00  0.00% in.telnetd
 4510 root       1  39    0 1816K 1448K sleep    0:00  0.00% in.telnetd

Can any one let me know why tomcat can hang in such stage???

..Raj
--

On Thu, 13 Mar 2003 12:01:00 Shapira, Yoav wrote:


Howdy,
There is one heap per JVM, period.  It has nothing to do with tomcat or
web applications.  You can tune this heap extensively using the various
java runtime options: http://java.sun.com/docs/hotspot/VMOptions.html

If it's an emergency and in production, just allocate more memory to the
overall heap for now.  But you should immediately start to profile your
applications, identify any leaks, and fix them, all in a development
environment.

Yoav Shapira
Millennium ChemInformatics




-----Original Message-----
From: Raja Sekhar [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 13, 2003 11:18 AM
To: [EMAIL PROTECTED]
Subject: Increase heap for a specific webapplication

Hi,

I have two web applications running in my Tomcat 4.0.6. One application


is


data centric and heavily loaded and other is very light with hardly any
users hitting. Now what I observe is sometimes if there is a heavy


search


made on the first system... it basically stops responding. I cant send


any


further requests till restart. But if I hit the second webapp, it still
keeps responding.

So what I feel is tomcat is internally dividing the heap and virtual


memory


for all the webapps equally.. Is there anyway I can alter this heap for
each webapp separately??

Or please let me know any other alternative for this problem asap


because


this is a production problem.

Thanks & Regards,

..Raj


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