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Old   October 9, 2002, 04:01
Default Fortran compiler for Linux cluster
  #1
Jan Rusås
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Which Fortran compiler do you use for your Linux cluser? and which would you recommend Thanks in advance Jan

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Old   October 9, 2002, 07:55
Default Re: Fortran compiler for Linux cluster
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cfd guy
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I've heard that you need the Portland compiler. It is quite expensive.
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Old   October 9, 2002, 08:28
Default Re: Fortran compiler for Linux cluster
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Michael Bo
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The CFX Community pages says GCC could do the job
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Old   October 9, 2002, 08:39
Default Re: Fortran compiler for Linux cluster
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Michael Bo
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....if you intend to run cfx-5 (and only single precission), otherwise portland is necessary when running cfx-4
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Old   October 9, 2002, 08:59
Default Re: Fortran compiler for Linux cluster
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Jan Rusås
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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
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Old   October 9, 2002, 09:01
Default Re: Fortran compiler for Linux cluster
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Jan Rusås
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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!!!!
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Old   October 9, 2002, 11:45
Default Re: Fortran compiler for Linux cluster
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cfd guy
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Or which precision you want to solve your problem.

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Old   October 10, 2002, 02:48
Default How important is the precision on CFX5
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Jan Rusås
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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)
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Old   October 21, 2002, 09:47
Default Re: Fortran compiler for Linux cluster
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Neale
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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.
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Old   October 31, 2002, 08:50
Default Re: Fortran compiler for Linux cluster
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Jan Rusås
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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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