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Subject: [OMPI devel] Issues with MPI_Add_error_class()
From: Lisandro Dalcin (dalcinl_at_[hidden])
Date: 2014-04-21 08:45:55

It seems the implementation of MPI_Add_error_class() is out of sync
with the definition of MPI_ERR_LASTCODE.

Please review the list of error classes in mpi.h and the code in this

BTW, in that file, all the MPI_T_ERR_XXX are not handled. The MPI-3
standard says they should be treated as other MPI error classes.
Trying to get an error string out of them (eg. MPI_T_ERR_MEMORY)
generates an error.

[dalcinl_at_kw2060 openmpi]$ cat add_error_class.c
#include <stdio.h>
#include <mpi.h>
int main(int argc, char *argv[])
  int errorclass,*lastused,flag;
  MPI_Init(&argc, &argv);
  MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_LASTUSEDCODE, &lastused, &flag);
  printf("errorclass:%d lastused:%d MPI_ERR_LASTCODE:%d\n",
errorclass, *lastused, MPI_ERR_LASTCODE);
  return 0;
[dalcinl_at_kw2060 openmpi]$ mpicc add_error_class.c
[dalcinl_at_kw2060 openmpi]$ ./a.out
errorclass:54 lastused:54 MPI_ERR_LASTCODE:71

[dalcinl_at_kw2060 openmpi]$ cat error_string.c
#include <stdio.h>
#include <mpi.h>
int main(int argc, char *argv[])
  char errorstring[MPI_MAX_ERROR_STRING];
  int slen;
  MPI_Init(&argc, &argv);
  MPI_Error_string(MPI_T_ERR_MEMORY, errorstring, &slen);
  printf("errorclass:%d errorstring:%s\n", MPI_T_ERR_MEMORY, errorstring);
  return 0;
[dalcinl_at_kw2060 openmpi]$ mpicc error_string.c
[dalcinl_at_kw2060 openmpi]$ ./a.out
[kw2060:20883] *** An error occurred in MPI_Error_string
[kw2060:20883] *** reported by process [140737332576257,0]
[kw2060:20883] *** on communicator MPI_COMM_WORLD
[kw2060:20883] *** MPI_ERR_ARG: invalid argument of some other kind
[kw2060:20883] *** MPI_ERRORS_ARE_FATAL (processes in this
communicator will now abort,
[kw2060:20883] *** and potentially your MPI job)

Lisandro Dalcin
Predio CONICET-Santa Fe
Colectora RN 168 Km 472, Paraje El Pozo
3000 Santa Fe, Argentina
Tel: +54-342-4511594 (ext 1016)
Tel/Fax: +54-342-4511169