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Jan Rusås October 9, 2002 04:01

Fortran compiler for Linux cluster
 
Which Fortran compiler do you use for your Linux cluser? and which would you recommend :) Thanks in advance Jan


cfd guy October 9, 2002 07:55

Re: Fortran compiler for Linux cluster
 
I've heard that you need the Portland compiler. It is quite expensive.

Michael Bo October 9, 2002 08:28

Re: Fortran compiler for Linux cluster
 
The CFX Community pages says GCC could do the job

Michael Bo October 9, 2002 08:39

Re: Fortran compiler for Linux cluster
 
....if you intend to run cfx-5 (and only single precission), otherwise portland is necessary when running cfx-4

Jan Rusås October 9, 2002 08:59

Re: Fortran compiler for Linux cluster
 
I have hear the same and also that it should be very expensive. That was the reason why I would like to know if anyone has found another solution. But what is expensive? and do I only need one for a cluster? Jan

Jan Rusås October 9, 2002 09:01

Re: Fortran compiler for Linux cluster
 
so for cfx5 double precission portland is the only option.

So the situation is that the price on the fortran compiler could determine which CFD software to use!!!!

cfd guy October 9, 2002 11:45

Re: Fortran compiler for Linux cluster
 
Or which precision you want to solve your problem.

:)

Jan Rusås October 10, 2002 02:48

How important is the precision on CFX5
 
I have seen cases for CFX4 where it was important if singel or double precision was used. How sensitive is CFX5 to this? (Probably not possible to give an clear answer to)

Neale October 21, 2002 09:47

Re: Fortran compiler for Linux cluster
 
The Portland Group Compiler costs about $500US. This is a bit pricy, but no different than any other commerical compiler for Linux. IMO it's probably the best quality commerical compiler for Linux (Absoft would be a close second).

As others have mentioned you can use g77 as well, but then you can't run double precision. The reason for this is that g77 does not have auto promotion compiler flags. i.e. flags that auto promote REAL data to DOUBLE PRECISION.

If you are running transient calculations for a very long time, or you are running grids that have very large aspect ratio cells, then you might need double precision, otherwise, for the most part, single precision should be fine.

Neale.

Jan Rusås October 31, 2002 08:50

Re: Fortran compiler for Linux cluster
 
Thanks for your answer Neale,

but the 500$ you mentioned, I guess they are just the anual fee for one license, there are also som initial cost which are much higher :((((

regards Jan


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