[Pw_forum] Fortran compiler

[Miguel Martinez Canales]

Dear all,

Following Paolo's warning, I've performed some tests with a not so  
surprising result: Paolo was right. For some reason, the ubuntu 9.10  
builds of gfortran 4.3 and 4.4.1 give astonishingly different results  
for example07. Well, the pw.x output is the same as in the reference,  
but the lambda values... at least they are of the same order of  
magnitude. Mind you, for once this is not an ubuntu bug, as it also  
happens in self-compiled gfortran 4.4.3 (Red Hat 5.4 in this case).  
However, the differences in lambda don't seem important in the case of  
gfortran 4.1.2 (the default in Red Hat) or 4.2.4 (the oldest version  
available in ubuntu 9.10).

I'm going to check other examples to see whether there are very  
different phonon frequencies elsewhere, but I don't expect anything  
good at all.

Regards,

Miguel

Paolo Giannozzi <giannozz at democritos.it> escribió:

>
> On Mar 17, 2010, at 16:35 , Vo, Trinh (388C) wrote:
>
>> I am actually compiling QE with the current version of gfortran,
>> and I have to think again whether I should continue to use it.  :-).
>
> you should, unless you have evidence of the opposite, or unless
> you are using exotic features, or the phonon code. The basic
> functionalities seem to work.
>
> P.
> ---
> Paolo Giannozzi, Dept of Physics, University of Udine
> via delle Scienze 208, 33100 Udine, Italy
> Phone +39-0432-558216, fax +39-0432-558222
>
>
>
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-- 
----------------------------------------
Dr Miguel Martinez Canales
   Department of Physics & Astronomy
   University College London
   Gower Street, London, WC1E 6BT (UK)
Fax:  +44 207 679 0595
Tlf:  +44 207 678 3476
----------------------------------------

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