[mpich-discuss] MPI_Comm_spawn_multiple() fails

Mon Apr 5 12:27:00 CDT 2010

Nope. Screen output:

-----Original Message-----
From: mpich-discuss-bounces at mcs.anl.gov [
mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Jayesh Krishna
Sent: Monday, April 05, 2010 10:17 AM
To: Bakkal, Alex
Cc: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] MPI_Comm_spawn_multiple() fails

Hi,
 Does it work if you launch it using mpiexec (mpiexec -n 1
mpi_spawn.exe)?

Regards,
Jayesh
----- Original Message -----
From: "Alex Bakkal" <Abakkal at LOANPERFORMANCE.com>
To: "Jayesh Krishna" <jayesh at mcs.anl.gov>
Cc: mpich-discuss at mcs.anl.gov
Sent: Monday, April 5, 2010 12:02:13 PM GMT -06:00 US/Canada Central
Subject: RE: [mpich-discuss] MPI_Comm_spawn_multiple() fails

 Hi,

The mpi_spawn.cpp is attached. I am calling my app directly:

D:\Projects\mpi_spawn\Release>mpi_spawn.exe

Thank you for your help.

Alex

-----Original Message-----
From: Jayesh Krishna [mailto:jayesh at mcs.anl.gov]
Sent: Monday, April 05, 2010 7:16 AM
To: Bakkal, Alex
Cc: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] MPI_Comm_spawn_multiple() fails

Hi,
 Can you send us the modified test program (attach it in your email) ?
Also let us know how you ran the test (the complete mpiexec command).

Regards,
Jayesh
----- Original Message -----
From: "Alex Bakkal" <Abakkal at LOANPERFORMANCE.com>
To: "Jayesh Krishna" <jayesh at mcs.anl.gov>
Cc: mpich-discuss at mcs.anl.gov
Sent: Friday, April 2, 2010 7:22:21 PM GMT -06:00 US/Canada Central
Subject: RE: [mpich-discuss] MPI_Comm_spawn_multiple() fails

I am very sorry for misleading you in my previous response. The app does
NOT run with  
char * progs[NHOST] = { "c:\\mpi_spawn" , "c:\\mpi_spawn" };

It hangs but at least it spawned two instances of mpi_spawn.exe

-----Original Message-----
From: Jayesh Krishna [mailto:jayesh at mcs.anl.gov]
Sent: Friday, April 02, 2010 3:20 PM
To: Bakkal, Alex
Cc: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] MPI_Comm_spawn_multiple() fails

 Does,

char * progs[NHOST] = { "c:\\mpi_spawn" , "c:\\mpi_spawn" };

 work for you ?

Regards,
Jayesh
----- Original Message -----
From: "Alex Bakkal" <Abakkal at LOANPERFORMANCE.com>
To: "Jayesh Krishna" <jayesh at mcs.anl.gov>
Cc: mpich-discuss at mcs.anl.gov
Sent: Friday, April 2, 2010 4:04:11 PM GMT -06:00 US/Canada Central
Subject: RE: [mpich-discuss] MPI_Comm_spawn_multiple() fails

Yes, spawning one instance (if you mean that by single program) works
fine but spawning two instances of the same program (even located in two
separate folders) hangs.

char * progs[NHOST] = { "c:\\mpi_spawn" , "c:\\tm\\mpi_spawn" };

Thank you.

Alex

-----Original Message-----
From: Jayesh Krishna [mailto:jayesh at mcs.anl.gov]
Sent: Friday, April 02, 2010 1:59 PM
To: Bakkal, Alex
Cc: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] MPI_Comm_spawn_multiple() fails

Hi,
 I tried spawn() with the host info set to "localhost" and it worked
fine for me (However I spawned using a single program. Does that work
for you ?).

Regards,
Jayesh
----- Original Message -----
From: "Alex Bakkal" <Abakkal at LOANPERFORMANCE.com>
To: jayesh at mcs.anl.gov, mpich-discuss at mcs.anl.gov
Sent: Friday, April 2, 2010 3:24:21 PM GMT -06:00 US/Canada Central
Subject: RE: [mpich-discuss] MPI_Comm_spawn_multiple() fails

Hi Jayesh,

Thank you for response. My test app, as well as the examples that you
have referred me to, works fine locally until I attempt to set "host"
key in MPI_Info. Unfortunately, I need that key in order to spawn
remotely. That is my ultimate goal.

Thank you anyway.

Alex

-----Original Message-----
From: jayesh at mcs.anl.gov [mailto:jayesh at mcs.anl.gov]
Sent: Friday, April 02, 2010 8:07 AM
To: mpich-discuss at mcs.anl.gov
Cc: Bakkal, Alex
Subject: Re: [mpich-discuss] MPI_Comm_spawn_multiple() fails

Hi,
 Couple of suggestions,

# Does it work if you use the same command (same program) for all
instances of the spawned procs ?
# Did you try setting the "path" infos for the commands ?

 You can find some examples at
https://svn.mcs.anl.gov/repos/mpi/mpich2/trunk/test/mpi/spawn (Look at
spawnminfo1.c) . Let us know the results.

Regards,
Jayesh
----- Original Message -----
From: "Alex Bakkal" <Abakkal at LOANPERFORMANCE.com>
To: mpich-discuss at mcs.anl.gov
Sent: Thursday, April 1, 2010 4:58:07 PM GMT -06:00 US/Canada Central
Subject: [mpich-discuss] MPI_Comm_spawn_multiple() fails

Hello,

I have installed MPICH2 v.1.2.1 on Windows XP Pro machines and was
trying to run the following test app on "mt" channel:

#define NHOST 2

int main( int argc, char * argv[]) {

int supported;

int rank, size;

MPI_Comm parent, intercomm;

MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &supported);

if (supported != MPI_THREAD_MULTIPLE){

printf( "The library does not support MPI_THREAD_MULTIPLE\n" );

exit(-1);

}

MPI_Comm_get_parent(&parent);

if (parent == MPI_COMM_NULL){

int i;

int nproc[NHOST] = {1 , 1 };

char * progs[NHOST] = { "c:\\mpi_spawn" , "c:\\tm\\mpi_spawn" };

MPI_Info infos[NHOST];

for (i=0; i < NHOST; i++) {

MPI_Info_create(&infos[i]);

MPI_Info_set(infos[i], "host" , "localhost" );

}

MPI_Comm_spawn_multiple(NHOST,

progs, MPI_ARGVS_NULL, nproc, infos,

0, MPI_COMM_WORLD, &intercomm, MPI_ERRCODES_IGNORE);

for (i=0; i < NHOST; i++) {

MPI_Info_free(&infos[i]);

}

}

else {

intercomm = parent;

}

MPI_Comm_rank(intercomm, &rank);

MPI_Comm_size(intercomm, &size);

printf( "[%d/%d] Hello world\n" , rank, size); fflush(stdout);

MPI_Comm_free(&intercomm);

MPI_Finalize();

return 0;

}

The app hangs. I can see three (as expected) instances of the program in
the Task Manager but MPI_Comm_spawn_multiple() never returns control to
my app.

I have reduced the number of spawned hosts to one and it ran
successfully. Also, it spawned successfully two hosts with the following
line commented out:

//MPI_Info_set(infos[i], "host" , "localhost" );

I have tried it on two machines with the same result.

Also, I have tried to spawn just one instance but on the remote host and
got the following error messages:

ERROR:unable to read the cmd header on the pmi context, Error = -1

ERROR:Error posting ready, An existing connection was forcibly closed by
the remote host.

I am not sure whether that is related to the first issue?

Any insight would be greately appreciated.

Thank you.

Alex

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