[mpich-discuss] Run an executable file on several windows computers

[Jayesh Krishna]

Hi,
>> Now, I am able to run this executable file on my multiprocessor CPU by coping "mpiexec.exe" and "smpd.exe" to the directory which the executable file ...

 You shouldn't have to copy smpd.exe & mpiexec.exe to the directory containing the executable. Please modify the user PATH to include the path to the bin directory of the MPICH2 installation (c:\Program Files\MPICH2\bin) .

 Please install MPICH2 on all the hosts where you need to run your job. You can use the "-machinefile" option of mpiexec to specify the list of hosts to launch your MPI job (You can find more details on how to use the option in Section 9.6 of the Windows developer's guide - http://www.mcs.anl.gov/research/projects/mpich2/documentation/files/mpich2-1.3.2-windevguide.pdf).

 Let us know if you need further help.

Regards,
Jayesh

----- Original Message -----
From: "Florin Ciubotaru" <florinciu at gmail.com>
To: mpich-discuss at mcs.anl.gov
Sent: Tuesday, March 1, 2011 4:41:56 AM
Subject: Re: [mpich-discuss] Run an executable file on several windows	computers



Hi Ramin, 


Not sure it there's an dynamic host query built in smpd. This is probably less then optimal, but I'll post my solution since I've also been looking for this for a while. 


You will need smpd running on each machine. You can start/install it as a service using "smpd -install"", or as a regular process using "smpd -start"(needs admin rights). 
If you are on windows it's better if you put your machines in a workgroup(you can also use a domain or other setting but might take more work). 
You also need to define a static list with your host names. You can set this with "smpd -sethosts hostName1 hostName2...". 


Your executables(and dependencies) should be copied to each machine. Simplest way to use "mpiexec" is to have each %PATH% variable containing the folders with your executables. Another way is to have the executables put in a windows share folder and use the entire network path when you start the process. Longer term solutions for maintaining these configs are provided by mpi machine files. You can read about them on the mpi documentation. 


After this step "mpiexec" will run your application start your application on each defined host in the order of their listing. If -np is higher then the number of hosts then multiple processes will be assigned to some hosts. You can control this by using "mpiexec -hosts .." 
This should be fine if you are ok with a static list of hosts. 


I've been looking for a dynamic host query, but I didn't find one. If you also need this, you could create a startup script that pings the initial hosts list using "smpd -traceoff". A second "smpd -sethosts" should set only the nodes that are up. 


Hope this helps, 
Florin Ciubotaru 

On Tue, Mar 1, 2011 at 10:34 AM, Ramin Mousavi < s.raminmousavi at gmail.com > wrote: 


Dear all 

I have installed " mpich2-1.3.2p1-win-ia32.msi " of MPI on my PC and I`m trying to run a " windows parallel executable version " of " Lammps Molecular dynamics Simulator " ( lmp_win_mpi.exe ) on two or three windows computers i.e. 4 or 6 number of processors. 

Now, I am able to run this executable file on my multiprocessor CPU by coping " mpiexec.exe " and " smpd.exe " to the directory which the executable file ( lmp_win_mpi.exe ) exists and try this command through the Command prompt : 
" mpiexec -np 2 -localonly lmp_win_mpi.exe -in Input_Water.in " and it always works successfully! 

Now my question is , How can I use , Multi processors CPUs of other computers to run this executable file and reduce total time of running, I`m Sorry but I`m absolutely New at Parallel Computations and Network !!! 
Your Considerations will be appreciated ;) 

-- 
Ramin Mousavi 

-- 
Ramin Mousavi 


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