[Pw_forum] about parallel calculation under opteron linux cluster with mpich

[Gerardo Ballabio]

On 06/29/05 11:21:48, Jian ZHOU wrote:
> Dear all,
> 
> I download the last version 2.1.4 of pwscf, and compile with the
> following the make.sys:

> DFLAGS         =  -D__LINUX64 -D__PGI -D__FFTW -D__USE_INTERNAL_FFTW

> For the serial version(replace the mpif90 to pgf90), it works well.  
> However, when I use this parallel version, it only created one  
> thread even if I told it to run with 2 thread.

These DFLAGS generate serial executable. For parallel executable  
-D__MPI -D__PARA must be added. If you use configure, they should be  
generated correctly.

> When I use defaut make.sys file created by ./configure script, it
> shows a "Segmentation fault" error. So, I make some changes in the
> make.sys.

Could you please post that make.sys? What changes exactly you have to  
do to get rid of the error?

Gerardo