Intel core i5 machine: install 32-bit linux and intel fortranor 64-bit?
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From: Tim Prince on 8 Feb 2010 04:55 On 2/7/2010 4:38 PM, News user wrote: > So, is there any difference in the computation speed between the 32- > bit or 64-bit? > If not, for me it is easier to use the 32-bit software (linux/intel > fortran) since I also have > older 32-bit machines. Assuming you don't write anything big enough to take advantage of the larger 64-bit addressing space, the answer is application dependent. Sometimes, compilers will perform more optimizations for 64-bit mode, on account of less tight space requirements, as well as the large number of registers available. There are a few performance bugs in ifort, where either of 32- or 64-bit mode is unnecessarily slow. 64-bit mode is prevalent enough that more goes into optimizing compilers and libraries for it. There is no way you will be satisfied with the performance of a 9 year old 32-bit CPU in comparison with the new one.
From: Tim Prince on 8 Feb 2010 04:56
On 2/7/2010 4:38 PM, News user wrote: > So, is there any difference in the computation speed between the 32- > bit or 64-bit? > If not, for me it is easier to use the 32-bit software (linux/intel > fortran) since I also have > older 32-bit machines. Assuming you don't write anything big enough to take advantage of the larger 64-bit addressing space, the answer is application dependent. Sometimes, compilers will perform more optimizations for 64-bit mode, on account of less tight space requirements, as well as the large number of registers available. There are a few performance bugs in ifort, where either of 32- or 64-bit mode is unnecessarily slow. 64-bit mode is prevalent enough that more goes into optimizing compilers and libraries for it. There is no way you will be satisfied with the performance of a 9 year old 32-bit CPU in comparison with the new one. |