[Pw_forum] Parallel installation MPIF90 issue

[Vikas Varshney]

Dear Soumyajyoti, Riccardo,
Thanks for your input. I successfully finished the installation (it seems).
I also included LD_LIBRARY_PATH as Soumya mentioned. When I tried to run
examples through run_example (example01), it seems it is running in serial
on single processor. I looked around a little bit and found that I need to
put the path to mpiexec and no of processors in enviromental_variable files
in PARA_PREFIX and PARA_POSTFIX options. When I tried that, this is what I
got.

PARA_PREFIX = ~/local/openmpi/bin/mpiexec -n 4
PARA_POSTFIX =

What I got was "No executable was specified on the mpiexec command line". I
though the run_example script will take care of the executable as it contain
of the following lines

PW_COMMAND="$PARA_PREFIX $BIN_DIR/pw.x $PARA_POSTFIX"
I tried searching it in archive but did not get a satisfactory answer.


Best Wishes,
Vikas Varshney


On Wed, May 26, 2010 at 3:39 PM, soumyajyoti haldar <
soumyajyoti.haldar at gmail.com> wrote:

> Hi,
>
>  On Wed, May 26, 2010 at 9:11 PM, Riccardo Di Meo <dimeo at democritos.it>wrote:
>
>>  Vikas Varshney wrote:
>> > Dear all,
>> > I have a very simple question.
>> >
>> > I have 2 mpif90 installed on my machine
>> > one in /usr/local/bin which does not have fortran support. It says
>> > "Unfortunately, this installation of Open MPU was not compiled with
>> > Fortran 90 support ..."
>> > other one is in my local directory which was installed by me. It does
>> > have fortran compiler (ifort).
>> >
>> > When, I try to run configure script to genarate makefile, it assumes
>> > mpif90 to be the first one and results in unsuccessful configure. So,
>> > my question is that how can I direct the configure script to look for
>> > other mpif90 and the assciated libraries and header files. Where do I
>> > need to make necessary changes? Or do I need to ask my admin to update
>> > mpif90 in /usr/local/bin (where I dont have writable access)?
>>
>> Two solutions:
>>
>> There's a MPIF90 environment variable, which can be set to the mpif90
>> compiler of your choice. Just point it to your mpif90 binary in your
>> home before configuring QE. This is the standard/correct solution.
>>
>> A "one size fits all" solution, which you can use also for other similar
>> cases ,would be to make your PATH environment variable give precedence
>> to the location of the mpif90 compiler you want to use:
>>
>> export PATH=<location of your mpif90>:$PATH  [bash]
>>
>
> you need to set correct LD_LIBRARY_PATH also. Otherwise during compilation
> and run time it may pickup the wrong library and give you error. set this as
> follows
> export LD_LIBRARY_PATH=<location of your installed openmpi
> directory>/lib:$LD_LIBRARY_PATH [bash]
>
> and one personal experience ,by default  /usr/bin and /usr/local/bin are
> set as path when u boot up the system.
> and now if you  your current mpif90 directory to PATH, it may not pick up
> the correct one. bcoz u have 2 mpif90, one is in /usr/bin , other is in some
> directory in you home.  the search order for the mpif90 depends on which
> folder path is loaded to your path variable first .  So if your PATH
> variable contains the entry of /usr/bin first then it'll not pick up the
> mpif90 from ur home.
>
> I made some changes in my .bash_profile as follows
>
> line 1 : unset PATH
> line 2 : export PATH="${PATH}:<location of your mpif90>"
> line 3: export PATH="${PATH}:/bin:/usr/bin:/usr/local/bin" and finally load
> "/etc/profile" again
> line 4: source /etc/profile
>
> use it with extreme caution ...
>
>
>
>> Hope this helps,
>> RDM
>>
>> >
>> > Thanks in advance.
>> >
>> > Best Regards,
>> > Vikas
>> > ------------------------------------------------------------------------
>> >
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>> >
>>
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>
>
> Hope this helps ....
>
>
> SJH
>
> --
> Junior Research Fellow
> Advance Computing Laboratory
> Department of Physics, University of Pune
> Ganeshkhind, Pune - 411007; INDIA
>
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