[mpich-discuss] array_of_argv in the MPI_Comm_spawn_multiple

[Rajeev Thakur]

Don't know why this may happen. Just do a printf before the
Comm_spawn_multiple to see if the hang occurs even before that, i.e.,
outside of MPI.
 
Rajeev


  _____  

From: mpich-discuss-bounces at mcs.anl.gov
[mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Federico Golfrè
Andreasi
Sent: Monday, January 12, 2009 4:19 AM
To: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] array_of_argv in the MPI_Comm_spawn_multiple


Here I send you a little test program:

- the manager.cpp file contains the manager part that initializes a Petsc
Session, prints some informations about the command line options and then
executes the "worker program" with MPI_Comm_spawn_multiple. The firts
command line option of the master must the executable name of the worker.
- the worker.cpp file prints informations about the command line options and
exit.

I use MPICH-2 and Petsc 2.3.3 and the gcc 1.4.2 compiler.


To execute the program I type:

mpiexec -n 2 ./manager ./worker -arg1 1 -arg2 2 -arg3 3 -arg4 4 -arg5 5
-arg6 6 -arg7 7 -arg8 8 -arg9 9 -arg10 10 -arg11 11 -arg12 12 -arg13 13
-arg14 14 -arg15 15 -arg16 16 -arg17 17 -arg18 18 -arg19 19 -arg20 20 -arg21
21 -arg22 22 -arg23 23 -arg24 24 -arg25 25 -arg26 26 -arg27 27 -arg28 28
-arg29 29 -arg30 30 -arg31 31 -arg32 32 -arg33 33 -arg34 34 -arg35 35 -arg36
36

Stopping at -arg35 35 the program executes.

Thank you very much!
Federico 






2009/1/9 Rajeev Thakur <thakur at mcs.anl.gov>


Can you send us a small test program that demonstrates the error?
 
Rajeev


  _____  


From: mpich-discuss-bounces at mcs.anl.gov
[mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Federico Golfrè
Andreasi

Sent: Thursday, January 08, 2009 3:34 AM 

To: mpich-discuss at mcs.anl.gov

Subject: Re: [mpich-discuss] array_of_argv in the MPI_Comm_spawn_multiple


I noticed that problem when the argv has dimension more than about 50
elements and 450 characters.

Thank you,
Federico




2009/1/7 Rajeev Thakur <thakur at mcs.anl.gov>


How big is the argv you are passing?
 
Rajeev


  _____  

From: mpich-discuss-bounces at mcs.anl.gov
[mailto:mpich-discuss-bounces at mcs.anl.gov] On Behalf Of Federico Golfrè
Andreasi
Sent: Wednesday, January 07, 2009 4:17 AM
To: mpich-discuss at mcs.anl.gov
Subject: [mpich-discuss] array_of_argv in the MPI_Comm_spawn_multiple


Hi,


        I've a problem in using the MPI_Comm_spawn_multiple.
When I use that function with a large number of arguments in the
array_of_argv parameter
the program execution freezes in the point.

There is a maximum length of the argv or a maximum number of elements of
argv that can be used?

Thank you!
Federico




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