Building an MPI library - Historique des versions

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Emillour : Page créée avec « There are a few freely available MPI libraries around; among the most widely spread are the OpenMPI and MPICH libraries == Checking if you have an Fortran enabled MPI lib... »

2023-01-05T10:42:47Z

Page créée avec « There are a few freely available MPI libraries around; among the most widely spread are the OpenMPI and MPICH libraries == Checking if you have an Fortran enabled MPI lib... »

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There are a few freely available MPI libraries around; among the most widely spread are the OpenMPI and MPICH libraries

== Checking if you have an Fortran enabled MPI library already installed and at hand ==
This can easily be done by checking if the MPI wrapper '''mpif90''' is available, i.e. that
<syntaxhighlight lang="bash">
which mpif90
</syntaxhighlight>
returns something meaningful

== Example of installing the OpenMPI library ==
To adapt to fit your onw needs and system specificities, obviously.
In the example below the installation is done in the '''$HOME/LMDZ''' directory (for convenience this path is stored in the '''PATH_OPENMPI''' variable.
<syntaxhighlight lang="bash">
PATH_OPENMPI=$HOME/LMDZ/
mkdir -p $PATH_OPENMPI
cd $PATH_OPENMPI
wget https://www.open-mpi.org/software/ompi/v1.10/downloads/openmpi-1.10.3.tar.gz
gunzip openmpi-1.10.3.tar.gz
tar xvf openmpi-1.10.3.tar
cd openmpi-1.10.3
./configure --prefix $PATH_OPENMPI/openmpi-1.10.3
make all install
</syntaxhighlight>
To check that the install went well check that...

== Worth knowing about ==
...

03/01/2022

[[Category:HowTo]]
[[Category:WhatIs]]

@@ Ligne 53 : / Ligne 53 : @@
 mpif90 --version
 </syntaxhighlight>
-* in some cases the Fortran wrapper is called '''mpifort''' or '''mpiifort''' (e.g. with ifort) , not '''mpif90'''
+* in some cases the Fortran wrapper is called '''mpifort''' or '''mpiifort''' (e.g. with ifort, sometimes) , not '''mpif90'''
 * It is vital to use the '''mpirun''' command from the same package than the '''mpif90''' compilation wrapper used to compile the code. Otherwise one can get some really weird results...

@@ Ligne 53 : / Ligne 53 : @@
 mpif90 --version
 </syntaxhighlight>
-* in some cases (e.g. with ifort) the Fortran wrapper is called '''mpiifort''', not '''mpif90'''
+* in some cases the Fortran wrapper is called '''mpifort''' or '''mpiifort''' (e.g. with ifort) , not '''mpif90'''
 * It is vital to use the '''mpirun''' command from the same package than the '''mpif90''' compilation wrapper used to compile the code. Otherwise one can get some really weird results...

@@ Ligne 39 : / Ligne 39 : @@
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 </syntaxhighlight>
 == A few things worth knowing about ==
@@ Ligne 45 : / Ligne 53 : @@
 mpif90 --version
 </syntaxhighlight>
-* in some cases (e.g. with ifort) the Fortran wrapper is called '''mpiifort''' , not '''mpif90'''
+* in some cases (e.g. with ifort) the Fortran wrapper is called '''mpiifort''', not '''mpif90'''
-* It is vital to use the '''mpirun''' command from the same package than the '''mpif90''' compilation wrapper use to compile. Otherwise one can get some really weird results...
+* It is vital to use the '''mpirun''' command from the same package than the '''mpif90''' compilation wrapper used to compile the code. Otherwise one can get some really weird results...
 /01/2022

@@ Ligne 16 : / Ligne 16 : @@
 == Example of personal installation of the the OpenMPI library ==
 To adapt to fit your onw needs and system specificities, obviously.
-In the example below the installation is done in the '''$HOME/LMDZ''' directory (for convenience this path is stored in the '''PATH_OPENMPI''' variable.
+In the example below the installation is done in the '''$HOME/myopenmpi''' directory (for convenience this path is stored in the '''PATH_OPENMPI''' variable.
 <syntaxhighlight lang="bash">
-PATH_OPENMPI=$HOME/LMDZ/
+PATH_OPENMPI=$HOME/myopenmpi/
 mkdir -p $PATH_OPENMPI
 cd $PATH_OPENMPI
@@ Ligne 25 : / Ligne 25 : @@
 tar xvf openmpi-1.10.3.tar
 cd openmpi-1.10.3
-./configure --prefix $PATH_OPENMPI/openmpi-1.10.3
+./configure --prefix $PATH_OPENMPI
 make all install
 </syntaxhighlight>
 To check that the install went well check that
 <syntaxhighlight lang="bash">
-$PATH_OPENMPI/openmpi-1.10.3/bin/mpif90 -V
+$PATH_OPENMPI/bin/mpif90 -V
 </syntaxhighlight>
 returns something meaningful like
@@ Ligne 56 : / Ligne 56 : @@
 * It is vital to use the '''mpirun''' command from the same package than the '''mpif90''' compilation wrapper used to compile the code. Otherwise one can get some really weird results...
-/01/2022
+/05/2023
-[[Category:HowTo]]
+[[Category:FAQ]]

@@ Ligne 35 : / Ligne 35 : @@
 == Worth knowing about ==
-...
+* '''mpif90''' is just a wrapper around a given compiler which could be gfortran, ifort, pgfortran, etc. to know more about that run
 /01/2022