[mpich-discuss] Getting started in Win XP

[jayesh at mcs.anl.gov]

Hi,

# Do the two machines have the same architecture (are they both 32-bit machines) ? 

# Does "mpiexec -hosts 2 Issac 1 Gauss 1 hostname" work (It should just print the hostnames of the two machines)?

# Does "mpiexec -n 2 fpi.exe" work on both machines ?

# Do you have any firewall running on the machines ? If so, please try again after turning off the firewall.

# Also try specifying the ipaddresses of the machines instead of hostnames (mpiexec -hosts 2 IPADDRESS_OF_ISSAC 1 IPADDRESS_OF_GAUSS 1 fpi.exe). You can get the ipaddress by typing "ipconfig" at the command prompt.

 Let us know the results.

Regards,
Jayesh
----- Original Message -----
From: "Charles Lawson" <chucksolve at gmail.com>
To: "MPICH Discussion" <Mpich-discuss at mcs.anl.gov>
Cc: EvansBW at gmail.com
Sent: Wednesday, April 21, 2010 9:26:51 PM GMT -06:00 US/Canada Central
Subject: [mpich-discuss] Getting started in Win XP



I downloaded MPICH2 for Windows in Nov, 2009. I installed in on two PC's that I call Issac and Gauss that have access to my home wireless network. The installation file is mpich2-1.2-win-ia32.msi. Issac uses XP-Pro and Gauss uses XP-Home. 

I purchased the Intel Fortran compiler, Vers 11.1, in July, 2009, for use on Issac, and I regularly use it there. I compiled the test case, fpi.f, on Issac. I (eventually) got a successful execution on a single PC by using the statement: 

mpiexec -hosts 1 Issac 1 fpi.exe 

I issued this command in a directory that contained mpiexec.exe and fpi.exe. I am the only user of this PC, and I do not use a password -- maybe I should say I have a blank password. Anyway the above command line didn't work initially because it asked for a password, and I didn't have one. I then set up a second User Name and gave it a password. Working under that User Name I again issued the above command line and I gave it the password when it asked for it, and it worked!! I was happy. 

Moving on to try running this on my two PC's, I tried the command line: 

mpiexec -hosts 2 Issac 1 Gauss 1 fpi.exe 

I had Gauss running with a User Name that has a password (which may or may not have any bearing on the situation.) 

This failed with the message: 

launch failed: CreateProcess(fpi.exe) on 'Gauss' failed, error 2 - The system cannot find the file specified. 

Then I tried giving fpi.exe a full path. I used: 

mpiexec -hosts 2 Issac 1 Gauss 1 \\Issac\mpi\fpi.exe 

That got further, but still not a complete execution. This responded with: 
Process 0 of 2 is alive 
Enter the number of intervals: (0 quits) 
Process 1 of 2 is alive 

I entered 50, but there was no response. I entered 0 and still no response, so I killed the run. 

I added four Fortran write statements into the test case, fpi.f. Before and after the Call MPI_BCAST and before and after the Call MPI_REDUCE. Each write included the value of myid in the output. I recompiled that. I then tried the last command line above again. It responded with: 

Process 0 of 2 is alive 
Enter the number of intervals: (0 quits) 
Process 1 of 2 is alive 
Proc 1 before call MPI_BCAST <= My debug write. 
50 <= My entry from the keyboard. 
Proc 0 before call MPI_BCAST <= My debug write. 

and then just hung at that stage. 

I conclude that fpi.exe is executing on both PC's, and on both PC's it has successfully gotten through calls to MPI_INIT, MPI_COMM_RANK and MPI_COMM_SIZE. The "print ... alive" statement functioned correctly on both PC's. Execution continued correctly up to the Call to MPI_BCAST. There it died. Why? 

I will greatly apprciate suggestions as to how to get this test case to run correctly. I am well acquainted with Fortran programming, but not well acquainted with lower level operating system or networking components. 

Hoping for help, 

Chuck 
===== 





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