Virtual Memory or Mem usage monitoring

[Jayson Enriquez <JE...@smud.org>]

Hi all, (another memory question)

 

I am currently running Tomcat 5.5 on Windows server 2003 (2gb). Tomcat
memory resources are monitored in Windows Task Manager. Should I be more
concerned with Mem Usage or VM usage? Is Virtual Memory the actual
memory usage? Will gc release memory after it hits -Xmx 256? What
will/should mem drop down to after release?

 

Catalina.bat - set CATALINA_OPTS=%CATALINA_OPTS%
-Djava.library.path="C:\Program Files\Documentum\shared" -Xms256m
-Xmx256m -verbose:gc

 

 

 

Thank you

________________________________

 

Jayson Enriquez CHDP

 

Re: Virtual Memory or Mem usage monitoring

[or...@kewlstuff.co.za]

I also do this, if I have threads and opening and closing db connections 
etc.... nice way to watch the thing running.
I find memory is not the thing to watch other than telling you in general 
that the machine doesnt have enough.
Watch the HANDLES.... those things should be go up and come down quickly or 
stabalize at some value.
If you have a problem with dB connections or you not releasing memory.... 
the handles will just keep climbing and then eventually windows will go 
snail on you and everything gets very very slow.

Internally Windows uses handles for everything whether its on the heap or 
memory mapped or access to a port, if they stable.... life is good.
If you then find a problem... netbeans has a profiler which should help you 
find where you not releasing memory.

regards,
Johnny



----- Original Message ----- 
From: "Jayson Enriquez" <JE...@smud.org>
To: <us...@tomcat.apache.org>
Sent: Thursday, March 29, 2007 7:17 PM
Subject: Virtual Memory or Mem usage monitoring


Hi all, (another memory question)



I am currently running Tomcat 5.5 on Windows server 2003 (2gb). Tomcat
memory resources are monitored in Windows Task Manager. Should I be more
concerned with Mem Usage or VM usage? Is Virtual Memory the actual
memory usage? Will gc release memory after it hits -Xmx 256? What
will/should mem drop down to after release?



Catalina.bat - set CATALINA_OPTS=%CATALINA_OPTS%
-Djava.library.path="C:\Program Files\Documentum\shared" -Xms256m
-Xmx256m -verbose:gc







Thank you

________________________________



Jayson Enriquez CHDP





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