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From "Casper Wandahl Schmidt" <kalle.pri...@gmail.com>
Subject [OT]RE: Maximum memory that can be assigned to Tomcat on windows platform
Date Thu, 01 Dec 2011 08:39:42 GMT
See below. I hope MS Outlook does some decent indend so my response is clear -.-

-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net] 
Sent: 30. november 2011 18:51
To: Tomcat Users List
Subject: Re: Maximum memory that can be assigned to Tomcat on windows platform

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Casper,

On 11/30/11 3:37 AM, Casper Wandahl Schmidt wrote:
> Another question to ask is, why do you have 8GB memory when running 
> 32bit? That is just stupid since 32bit cannot address more than 4GB of 
> memory no matter what you do. Any sysadmin should know that right?

That's per process. All reasonably recent 32-bit OSs can address way more than 4GiB internally.

For example:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa366778%28v=vs.85%29.aspx#memory_limits

This is generally done through PAE
(http://en.wikipedia.org/wiki/Physical_Address_Extension) which allows 32-bit OSs to access
more than 4GiB at the kernel level, though each process is still limited to 4GiB.

Aha so I learned something new today :) I'm still puzzled as to how a 32 bit CPU can compute
and fetch a memory cell with address above 4GB since it cannot hold this large value. Anyway
that is just too much low-level computer science for me, all I ever had was a seven week course
on architecture and networking (a single week out of the seven) :)

-Casper

Running a machine with more than 4GiB in 32-bit mode isn't stupid at all IMO. If you have
relatively small processes, there's no need for the overhead of 64-bit even if you have 16GiB
or more.

- -chris
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