[Pw_forum] ifc/linux allocation of more than 2 GB dynamical memory

[Paolo Giannozzi]

On Tuesday 04 May 2004 13:57, Nicola Marzari wrote:

> we have recently realized that there is an issue running large jobs
> on Linux machines

The issue of maximum file and RAM size on Linux/Intel 32-bit 
processors has surfaced here more than once. The code doesn't 
impose any explicit limit to the size of files or allocated arrays or 
total RAM [*]. The compiler, libraries, operating system, kernel, 
or a combination of the above, impose limits. For the specific
case of the Intel compiler, I think that the only hope to find out
what is going on is here:

http://softwareforums.intel.com/ids/search?board.id=11&q=2Gb+limit

Paolo

[*] there is a limit coming from storage of pointers used by FFTW 
into 32-bit integers; one could easily use 64-bit integers instead.

-- 
Paolo Giannozzi             e-mail:  giannozz at nest.sns.it
Scuola Normale Superiore    Phone:   +39/050-509876, Fax:-563513 
Piazza dei Cavalieri 7      I-56126 Pisa, Italy