The ABINIT Users Mailing List ( CLOSED )

[Thierry Deutsch <tdeutsch@cea.fr>]

Linux uses PAE (Physical Address Extension).
PAE is a special mode using 36 bits to address the memory.
So you can use Linux with 64 GB of memory.
It seems that 2.4 has some trouble with that.

Nevertheless, a process has only 32 bits for the address so the limitation is 
4GB per process.

See http://www.spack.org/index.cgi/LinuxRamLimits:
"Without PAE compiled into the kernel the OS can address a maximum of 4GB of 
RAM. With 2.4 kernels (with a large memory configuration) a single process 
can address up to the total amount of RAM in the machine minus 1GB (reserved 
for the kernel), to a maximum 3GB."

Thierry Deutsch
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Thierry Deutsch                                                        
Laboratoire de simulation atomistique (L_Sim)
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