1) We are using tomcat in production with -Xmx1524M up to 1700, but I
have never used
it with -Xmx more than 2G. I can also verify that top shows java process
using more than 1GB.
Java process shows 200MB more allocated memory than -Xmx in top.
2) I have CentOS 4.4 machine at home that has 4GB of ram, I will test it
as soon as I get some time.
Andrew Pliszka
Caldarale, Charles R wrote:
From: Andrew Miehs [mailto:[EMAIL PROTECTED]
Subject: Re: [OT]Re: Is better one or more Tomcat instances
per machine
The user space is the amount of RAM you as a process can
allocate for this single process.
No - RAM has nothing to do with the split. Process memory is the amount
of virtual space allocated to the user; the OS may choose to use much
less RAM behind that virtual space. Page thrashing may occur, but the
process still gets to play with what it thinks is 2GB of "memory".
This is because there needs to be some way for your process
to interact with the hardware and kernel.
The global and local descriptor tables and the page directories/tables
provide the translation between virtual space and RAM. There need not
be any split between user space and kernel space, but it's useually more
efficient to create such a boundary.
- Chuck
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