Don't forget to leave some space for the OS' buffer cache. If your
app.s do a lot of I/O then they can benefit a great deal from having
the most commonly accessed storage blocks cached all the time.
W.r.t. Tomcat tuning this means you don't try to use up all of
physical memory with Tomcat instanc
On Mon, Mar 17, 2008 at 11:16:49PM +, Stephen Nelson-Smith wrote:
> I plan to test running with a newer JVM shortly. I have been told by
> the developers that the application needs to run under 1.4.2.
Whatever they mean by that.
If they mean, "needs 1.4.2 or newer", that's quite reasonable a
> From: Stephen Nelson-Smith [mailto:[EMAIL PROTECTED]
> I have a new machine with 8G of RAM, running a 32 bit 2.6 kernel
> (CentOS 5). It is running an application inside 4.1.37 with Java
> 1.4.2.
[...]
> What's the best way to make to most of the RAM?
1) 64-bit OS.
2) 64-bit JVM.
3) Newer Tom
> From: brien colwell [mailto:[EMAIL PROTECTED]
> Any program that needs 8gb of RAM to run seems suspect. Large amounts
> of data should be abstracted through the filesystem and dealt with as
> files.
I have several programs that will cheerfully use 8G, or more, of RAM. In
general, they are larg
there is a recorded webinar called "Inside the Java Virtual Machine"
http://www.covalent.net/services/training/webinars.html
it's one hour spent demystifying all you need to know about the JVM
memory usage, once you've understood that, you'll have a very different
perspective on -Xmx
Filip
S
On Mon, Mar 17, 2008 at 11:21 PM, Caldarale, Charles R
<[EMAIL PROTECTED]> wrote:
> > From: Stephen Nelson-Smith [mailto:[EMAIL PROTECTED]
> > How about running eg 3 x xen vms? The machine seems rarely pushed for
> > CPU, and with 3 vms I could load balance across them.
>
> Why bother with xen
, Charles R
<[EMAIL PROTECTED]> wrote:
> > From: Stephen Nelson-Smith [mailto:[EMAIL PROTECTED]
> > Subject: Re: Making the most of 8G of RAM
>
> >
> > I plan to test running with a newer JVM shortly. I have been told by
> > the developers that the ap
> From: Stephen Nelson-Smith [mailto:[EMAIL PROTECTED]
> Subject: Re: Making the most of 8G of RAM
>
> I plan to test running with a newer JVM shortly. I have been told by
> the developers that the application needs to run under 1.4.2. We
> shall see.
Unless the app uses the
On Mon, Mar 17, 2008 at 10:53 PM, Caldarale, Charles R
<[EMAIL PROTECTED]> wrote:
> > but so far I've not seen memory usage go over 1G.
>
> There is (or at least was) a bug in the Sun 1.4.2 JVM that didn't do the
> arithmetic right when heap sizes were over 2GB due to treating some
> unsigned
> From: Stephen Nelson-Smith [mailto:[EMAIL PROTECTED]
> Subject: Making the most of 8G of RAM
>
> Given that we only have a 32 bit address space, is it fair to say that
> I can't use more than 2G of RAM for my Java virtual machine?
Most 32-bit Linux systems will give you 3GB of virtual space (n
Stephen Nelson-Smith a écrit :
Hi,
I have a new machine with 8G of RAM, running a 32 bit 2.6 kernel
(CentOS 5). It is running an application inside 4.1.37 with Java
1.4.2.
Given that we only have a 32 bit address space, is it fair to say that
I can't use more than 2G of RAM for my Java virtual
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