[TriLUG] Memory Monitor on a Redhat system

[Robert Dale]

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