[mpich-discuss] MPID_nem_tcp_init(377)... gethostbyname failed, mac (errno 1)

[Luis Cebamanos]

Hi, 

I have also tried the following, with similar result:


$ mpiexec -n 1 -host localhost ./hello
[mpiexec at mac] HYDU_sock_is_local (utils/sock/sock.c:532): gethostbyname error on mac: Unknown host
[mpiexec at mac] main (ui/mpich/mpiexec.c:291): unable to check if localhost is local

 thought it could add some more info.

Cheers,
Luis



On 28 Feb 2014, at 12:25, Luis Cebamanos <l.cebamanos at epcc.ed.ac.uk> wrote:

> Hi all,
> 
> I have installed MPICH2 in a Mac 10.9.2 using homebrew. The installation process went OK, no problems were reported. Then I created a small hello world example just to test the MPI:
> 
> #include <stdio.h>
> #include "mpi.h"
> 
> int main (argc, argv)
>     int argc;
>     char *argv[];
> {
>  int rank, size;
> 
>  MPI_Init (&argc, &argv);/* starts MPI */
>  MPI_Comm_rank (MPI_COMM_WORLD, &rank);/* get current process id */
>  MPI_Comm_size (MPI_COMM_WORLD, &size);/* get number of processes */
> 
>  printf( "Hello world from process %d of %d\n", rank, size );
> 
>  MPI_Finalize();
>  return 0;
> }
> 
> compile it ($mpicc -o hello hello.c), all went fine too; and finally run it ($mpiexec -n 2 ./hello). However, that is the problem reported by mpiexec:
> 
> $ mpiexec -n 2 ./hello
> Fatal error in MPI_Init: Other MPI error, error stack:
> MPIR_Init_thread(467)..............: 
> MPID_Init(177).....................: channel initialization failed
> MPIDI_CH3_Init(70).................: 
> MPID_nem_init(319).................: 
> MPID_nem_tcp_init(171).............: 
> MPID_nem_tcp_get_business_card(418): 
> MPID_nem_tcp_init(377).............: gethostbyname failed, mac (errno 1)
> Fatal error in MPI_Init: Other MPI error, error stack:
> MPIR_Init_thread(467)..............: 
> MPID_Init(177).....................: channel initialization failed
> MPIDI_CH3_Init(70).................: 
> MPID_nem_init(319).................: 
> MPID_nem_tcp_init(171).............: 
> MPID_nem_tcp_get_business_card(418): 
> MPID_nem_tcp_init(377).............: gethostbyname failed, mac (errno 1)
> 
> ===================================================================================
> =   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
> =   PID 653 RUNNING AT mac
> =   EXIT CODE: 1
> =   CLEANING UP REMAINING PROCESSES
> =   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
> ===================================================================================
> 
> The version installed:
> $ mpichversion 
> MPICH Version:    	3.1
> MPICH Release date:	Thu Feb 20 11:41:13 CST 2014
> MPICH Device:    	ch3:nemesis
> MPICH configure: 	--disable-dependency-tracking --disable-silent-rules --prefix=/usr/local/Cellar/mpich2/3.1 --mandir=/usr/local/Cellar/mpich2/3.1/share/man
> MPICH CC: 	clang    -O2
> MPICH CXX: 	clang++  
> MPICH F77: 	/usr/local/bin/gfortran   -O2
> MPICH FC: 	/usr/local/bin/gfortran  
> 
> Does anyone have any idea of why I am getting this error? The hostname command is also working fine, so I do NOT understand this problem. Furthermore, the idea is to run MPICH2 on my mac, not in a cluster so it should be straightforward to pick the hostname. My /etc/hosts shows the following:
> $ cat /etc/hosts
> ##
> # Host Database
> #
> # localhost is used to configure the loopback interface
> # when the system is booting.  Do not change this entry.
> ##
> 127.0.0.1	localhost
> 255.255.255.255	broadcasthost
> ::1             localhost 
> fe80::1%lo0	localhost
> 
> Any ideas? Any help, suggestions or workarounds would be much appreciated.
> 
> Best regards,
> LuisThe University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
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