[mpich-discuss] MPI_Init problem

[Rod Cook]

I have a farming code where an MPI program spawns a number of jobs, these jobs then run a sequence of other MPI applications which fail in MPI_Init. I am using MPICH2 v1.08 under Windows XP. The MPI program (FARMER) spawns two executables (JOB) using MPI_Comm_spawn. These executables (JOB) then run (using CreateProcess) another MPI application (APP).  mpiexec is used to start all the MPI executables.

APP crashes (times out) in it's call to MPI_Init with the following message:

MPIDU_Sock_post_connect failed.
Fatal error in MPI_Init: Other MPI error, error stack:
MPIR_Init_thread(294): Initialization failed
MPID_Init(83)........: channel initialization failed
MPID_Init(334).......: PMI_Init returned -1[0] PMI_ConnectToHost failed: unable
to post a connect to Yellowtail yellowtail :1061, error: Unknown
error class, error stack:
MPIDU_Sock_post_connect(1228): unable to connect to Yellowtail yellowtail 
                          on port 1061, exhausted all endpoints (errno -1)
MPIDU_Sock_post_connect(1275): unable to connect to                 on port 1061,
 No connection could be made because the target machine actively refused it. (er
rno 10061)
MPIDU_Sock_post_connect(1275): unable to connect to yellowtail on port 1061, No
connection could be made because the target machine actively refused it. (errno
10061)
MPIDU_Sock_post_connect(1275): unable to connect to Yellowtail on port 1061, No
connection could be made because the target machine actively refused it. (errno
10061)
uPMI_ConnectToHost returning PMI_FAIL
[0] PMI_Init failed.


I think the crash is caused by MPI_Init in APP trying to synchronise with MPI_Comm_spawn in FARMER. There is no need for this from the farming codes point of view because APP is independent of both FARMER and JOB. The farming works OK if I replace APP with a version that doesn't use MPI. 


Thanks for your help,

Rod Cook
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