Ram defrag in UBUNTU

[Dedhi Sujatmiko]

Melissa Lane wrote:
> Just wondering if anyone knew how to defrag the RAM or knew of a 
> program that works in UBUNTU to defrag RAM. I used to use System 
> Mechanic Pro on Windows for all that stuff but it isnt available for 
> LINUX 

If we talk about hard disk, where the information access is not uniform 
and vary depending on the physical location of the data, it is true that 
we need defrag.
But for RAM, where in the PC-centric x86 design is uniform, there is no 
need for defrag since the distance of the data from RAM to the consumer 
are all the same. Thus there is no need for RAM defrag.
I never use the "System Mechanic Pro", thus I do not understand what 
will be the benefit of such arrangement.

Only in a real big SMP system, for example Fujitsu or Sun Fire 
Enterprise server, which may 40+ CPU, there is a technology called 
Memory Placement Optimization, since the RAM can be on the same System 
Board of a certain CPU, or can be on the different System Board from the 
consumer CPU, thus this kind of optimization is useful. Also for NUMA 
system, obviously.