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From Mikolaj Rydzewski <>
Subject RE: [OT]RE: Maximum memory that can be assigned to Tomcat on windows platform
Date Thu, 01 Dec 2011 11:38:01 GMT
 On Thu, 1 Dec 2011 12:29:14 +0100, Casper Wandahl Schmidt wrote:

> That didn't quite help me understand, because how can the OS map from 
> ie.
> 0-4GB to 4-8GB (the window is moved) when it can only use a 32bit 
> register
> to tell the machine where to look in the psysical memory, that is 
> where my
> knowledge ends :) So I read about PAE and found out that it uses 2 
> registers
> (36 bits due to some bits being used as flags) and that makes good 
> sense,
> but how can the cpu calculate an address without overflow and send a 
> command
> to the bus containing a 36bit address (or whatever fetches the bits 
> from
> RAM)? That is where I'm puzzled but I guess it is because I'm not at 
> all
> into ISA-level and below :)

 Well, it's rather out of the scope of this list.

 On the other hand, increasing java heap size is not always the best 
 option. It heavily depends on memory usage pattern in your application. 
 In general: the bigger heap, the longer GC will run.

 Mikolaj Rydzewski <>

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