[MPICH] problem net_send: could not write to fd=5, errno = 32

[ajit mote]

The problem is that number of send are not equal to number of recv
call ...
else part of ur code contain all processes other than rank 0 process, it
mean there is only one send but recv are more that send that will give u
error for more than two process ...

 if u give some idea what u want to do then it will be easy for us to
comment or use collective call ...

  sorry for my bad english ...

On Mon, 2007-01-15 at 13:54 -0600, Rajeev Thakur wrote:
> This program will not run on more than 2 processes because there is
> only 1 send (from rank 0 to 1), while all other processes call Recv
> and expect a message from rank 0.
>  
> Rajeev
> 
>         
>         ______________________________________________________________
>         From: Luiz Mendes [mailto:luizmendesw at gmail.com] 
>         Sent: Monday, January 15, 2007 1:31 PM
>         To: mpich-discuss at mcs.anl.gov
>         Cc: thakur at mcs.anl.gov; Geoff Jacobs
>         Subject: Re: [MPICH] problem net_send: could not write to
>         fd=5, errno = 32
>         
>         
>         
>         Hi Geoff, Rajeev, Antony
>         
>         Yes, i forgot to write. 
>         But problems continuing to be the same with MPI_Finalize().
>         
>         After, I was editing that code and i saw that if a process
>         execute MPI_Recv() that it wasnt destinated to itselft the
>         problem arises. 
>         
>         well, i was thinking that if a process analize one MPI_Recv
>         not destinated to it, the process simply would ignore it, but
>         this, until this moment, it seems to be wrong.
>         
>         thanks, sorry for foolish errors.
>         Luiz Mendes
>         
>         
>         2007/1/15, Rajeev Thakur <thakur at mcs.anl.gov>: 
>                 You need to add an MPI_Finalize.
>                  
>                 Rajeev
>                 
>                         
>                         ______________________________________________
>                         From: owner-mpich-discuss at mcs.anl.gov
>                         [mailto:owner-mpich-discuss at mcs.anl.gov] On
>                         Behalf Of Luiz Mendes
>                         Sent: Monday, January 15, 2007 12:22 PM
>                         To: mpich-discuss at mcs.anl.gov
>                         Cc: Geoff Jacobs
>                         Subject: Re: [MPICH] problem net_send: could
>                         not write to fd=5, errno = 32
>                         
>                         
>                         
>                         Hi Geoff,
>                         
>                         i dont know Geoff, the code is below:
>                         
>                         #include "mpi.h" 
>                         #include <stdio.h> 
>                         #include <string.h> 
>                         int main(int argc, char* argv[])
>                         {
>                             char mensagem[32];
>                             int numprocs, rank; 
>                             MPI_Status stat;
>                             MPI_Init(&argc,&argv); 
>                             MPI_Comm_size(MPI_COMM_WORLD,&numprocs); 
>                             MPI_Comm_rank(MPI_COMM_WORLD,&rank);
>                             if(rank==0)
>                             {
>                                 sprintf(mensagem, "Message Text"); 
>                                 MPI_Send(mensagem, 32, MPI_CHAR, 1, 0,
>                         MPI_COMM_WORLD);
>                             } 
>                             else
>                             {
>                                 MPI_Recv(mensagem, 32, MPI_CHAR, 0, 0,
>                         MPI_COMM_WORLD, &stat);
>                             }
>                         }
>                         
>                         when i run with mpirun -np 2 it works, and
>                         when i run with mpirun -np 3 i doesnt run and
>                         relates the following message below
>                         
>                         p2_23214:  p4_error: net_recv read:  probable
>                         EOF on socket: 1 
>                         bm_list_23184: (0.507200) wakeup_slave: unable
>                         to interrupt slave 0 pid 23183
>                         rm_l_1_23213: (0.257494) net_send: could not
>                         write to fd=6, errno = 9
>                         rm_l_1_23213:  p4_error: net_send write: -1
>                             p4_error: latest msg from perror: Bad file
>                         descriptor 
>                         rm_l_2_23236: (0.045590) net_send: could not
>                         write to fd=5, errno = 32
>                         p2_23214: (2.046247) net_send: could not write
>                         to fd=5, errno = 32
>                         
>                         
>                         What it could  be?
>                         
>                         I installed MPICH 1.2.7p1 with mode p4 i
>                         think. I am trying to run it on two PCS. I
>                         installed MPI in /usr/share/MPI-1 folder and
>                         share this one by NFS server with another PC. 
>                         
>                         Well i was trying to run another standard
>                         example simpleio.c, and it doesnt store things
>                         in other PC.
>                         
>                         What is happening?
>                         
>                         Thanks, 
>                         Luiz Mendes
>                         
>                         2007/1/15, Geoff Jacobs <gdjacobs at gmail.com>: 
>                                 Luiz Mendes wrote:
>                                 > HI all,
>                                 >
>                                 > i would like to know whats the
>                                 reason for this error
>                                 >
>                                 > net_send: could not write to fd=5,
>                                 errno = 32
>                                 >
>                                 > what should i do to correct this? I
>                                 searched for this error in internet 
>                                 > but i didnt find anything about.
>                                 >
>                                 > Its strange, because this error is
>                                 caused by the increase of number of
>                                 > processes in the execution of mpi
>                                 program.
>                                 >
>                                 > Could you help me?
>                                 > 
>                                 > Thanks
>                                 > Luiz Mendes
>                                 Segfault?
>                                 
>                                 --
>                                 Geoffrey D. Jacobs
>                                 
>                                 Go to the Chinese Restaurant,
>                                 Order the Special
>                         
>                         
>