[TriLUG] Memory Monitor on a Redhat system

[Len Boyle]

How much swap space do you have defined on disk? 
On Solaris the os reserve space in main memory for possible swap usage if there is none available on disk. I do not know if Red Hat does the same thing, but it is something that you might look at. 

len 

-----Original Message-----
From: trilug-bounces at trilug.org [mailto:trilug-bounces at trilug.org] On Behalf Of Robert Dale
Sent: Thursday, March 29, 2007 2:18 PM
To: Triangle Linux Users Group discussion list
Subject: Re: [TriLUG] Memory Monitor on a Redhat system

On 3/29/07, Tom Le <t.thanhcle at gmail.com> wrote:
> We are having problems with memory usage on a Redhat AS 4 - on a 
> 64-bit Power PC IBM pSeries. We was wondering if there is a reliable 
> package to monitor memory usage on the server. Our current problem is 
> that the system memory is 95% capacity and we have no idea what is 
> taking up all the memory. We are certain that oracle is using 1G out 
> of 16G of the box, and one instance of jboss is set to use max 1G of 
> memory. We are trying to add a second instance of jboss and it won't 
> start due to insufficient memory. We need a package or a way to drill 
> down to what application using how much memory on the server Any 
> suggestion is appreciated.

When you say at 95% capacity is that including buffers and cache?

What's your actual memory usage?  (/proc/meminfo would be useful here) MemTotal - MemFree - Buffers - Cached = actual used memory

What's the actual jboss error message?  Do you have the jvm stacktrace?
What jvm are you using?  What jvm options are you starting jboss with?

--
Robert Dale
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