topic Re: Missing MPI_f08_status conversion functions in Intel MPI in Intel® MPI Library

Missing MPI_f08_status conversion functions in Intel MPI

Linaro_Josh — Wed, 17 Jul 2024 14:47:51 GMT

Hey Intel,

I have noticed that IntelMPI is currently missing the following functions:

MPI_Status_f082f
MPI_Status_f2f08
MPI_Status_f082c
MPI_Status_c2f08

These functions are required for our MPI wrappers, but it appears they are also required by the MPI standard since 3.0. They are required to be avliable in both the C and Fortran workspace:

I was wondering if it was possible to add these functions into IntelMPI?

Re: Missing MPI_f08_status conversion functions in Intel MPI

TobiasK — Wed, 24 Jul 2024 14:43:03 GMT

@Linaro_Josh
do you have a reproducer that fails to build? Which version did you use to build? OS?

Re: Missing MPI_f08_status conversion functions in Intel MPI

Linaro_Josh — Wed, 24 Jul 2024 16:28:28 GMT

I used Intel MPI 2021.21 to compile on SLES-15.5.

Reproducer:

#include <mpi.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> int main(int argc, char** argv, char** environ) { int i; int my_rank; /* Rank of process */ int p; /* Number of processors */ int source; /* Rank of sender */ int dest; /* Rank of receiver */ int tag = 50; /* Tag for messages */ char message[100]; /* Storage for the message */ MPI_Status status; /* Return status for receive */ MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD, &my_rank); MPI_Comm_size(MPI_COMM_WORLD, &p); if (my_rank != 0) /* deliberately mismatch send-recv with 7 procs */ { sprintf(message, "Greetings from process %d!", my_rank); printf("sending message from (%d)\n", my_rank); dest = 0; /* Use strlen(message)+1 to include '\0' */ MPI_Send(message, strlen(message) + 1, MPI_CHAR, dest, tag, MPI_COMM_WORLD); } else { /* my_rank == 0 */ for (source = 1; source < p; source++) { printf("waiting for message from (%d)\n", source); MPI_Recv(message, 100, MPI_CHAR, source, tag, MPI_COMM_WORLD, &status); printf("%s\n", message); MPI_F08_status f08_status; MPI_Status_c2f08(&status, &f08_status); } } printf("all done...(%d)\n", my_rank); return 0; }

For example, if compiled with OpenMPI 5.0.0 this will compile okay but for IntelMPI I would get the following:

$ mpicc -g -O0 -o repro ./repro.c ./repro.c:37:13: error: call to undeclared function 'MPI_Status_c2f08'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 37 | MPI_Status_c2f08(&status, &f08_status); | ^ ./repro.c:37:13: note: did you mean 'MPI_Status_c2f'? /path/to/intel_installation/2024.1.0/mpi/2021.12/include/mpi.h:1648:5: note: 'MPI_Status_c2f' declared here 1648 | int MPI_Status_c2f(const MPI_Status *c_status, MPI_Fint *f_status) MPICH_API_PUBLIC; | ^ 1 error generated.

Re:Missing MPI_f08_status conversion functions in Intel MPI

TobiasK — Thu, 25 Jul 2024 12:43:45 GMT

Thanks for reporting that, we will likely fix it in the second next release, shipped with the oneAPI 2025.0 release.

Re:Missing MPI_f08_status conversion functions in Intel MPI

TobiasK — Wed, 28 Aug 2024 12:46:33 GMT

@Linaro_Josh

it's now confirmed, the fix is in 2025.0

Re: Missing MPI_f08_status conversion functions in Intel MPI

Linaro_Josh — Wed, 28 Aug 2024 13:17:17 GMT

Thanks @TobiasK, do let me know when this becomes available.