"how to use" resources about MPI module

General usage
1

Dear all,
MPI module existence in Scilab just came to my mind through the release note of recent Scilab 2023.1.0 . After checking MPI module installation along scilab installing Microsoft HPC Pack 2012 R2 (WIN10x64) I tried to run examples and it failed because “mpi.dll” not found. I guess this is because I don’t know how to deal with this remark in MPI help page:

Like any other MPI applications, Scilab/MPI as be started through the mpirun command usually with the argument -c to specify the number of nodes started.

May anyone help about demos (further documentation) of the MPI module (parallel computing) ?

Thanks,

David

2

Hi David,

Do you have a “mpi.dll” file in SCI/bin/?

Best regards.

3

Hi Vincent,
yes I do have mpi.dll and mpi.lib in SCI/Bin/ which is in my case :
C:\Users\usr\AppData\Local\scilab-2023.1.0\bin\

I did not restart my machine after installing the MPI runtime (but it was not requested ).

David

4

I just restarted my machine but it still fails equally.

--> cd SCI/modules/mpi\
 ans  =

  "C:\Users\AppData\Local\scilab-2023.1.0\modules\mpi"

--> exec('C:\Users\AppData\Local\scilab-2023.1.0\modules\mpi\examples\MPIHelloWorld.sci', -1)

--> MPIHelloWorld()
à la ligne     5 de la fonction MPIHelloWorld ( C:\Users\AppData\Local\scilab-2023.1.0\modules\mpi\examples\MPIHelloWorld.sci ligne 5 )

Impossible de charger la librairie mpi.dll

line 5 is actually: MPI_Init(); // should have lambooted first

5

Hello David,

Can you try to install GitHub - lucasg/Dependencies: A rewrite of the old legacy software "depends.exe" in C# for Windows devs to troubleshoot dll load dependencies issues. and check that all dependencies of mpi.dll are available on your PC?

Vincent

6

Hi Vincent,

I just checked the mpi.dll dependencies with the tool you pointed out and it is actually missing only msmpi.dll . Do you know how to fix it ? I have msvc 2017 installed on the same machine.

David

7

Hi David,

It seems that the installation of “Microsoft HPC Pack 2012 R2” did not work. Can you try to install it again?

Thanks.
Vincent

8

Hi Vincent,

i checked the installer and I reinstalled the Microsoft HPC Pack 2012 R2 and the msmpi.dll referenced by SCI/bin/mpi.dll is not anywhere in my machine, neither in windows nor program/Microsoft HPC Pack 2012 R2 .
So it doesn’t run in my case, don’t know if any other scilaber tried to run on Windows as well ?.

David

9

Hello,

MS MPI is not part of HPC pack anymore and is now a separate download:

I tested on my computer: after running the installer, msmpi.dll is now in C:\windows\system32 and C:\Windows\SysWOW64.

S.

1 Like
10

Thank you Stephane, now the HelloWorld() example is running properly. Let’s investigate further the MPI features…

David

2 Likes