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 large
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 Tomcat.
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 and
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
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 machine?
I tried to prove this
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
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 (not
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 values
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 keyword enum or the
If one of your webapps could use a faster database or filesystem, you
might look into using a ramdisk.
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.
On Mon, Mar 17, 2008 at 4:21 PM, Caldarale,
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? If you
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
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