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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Purpose: Common MPI routines
*
*/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5MMprivate.h" /* Memory Management */
#ifdef H5_HAVE_PARALLEL
/*-------------------------------------------------------------------------
* Function: H5_mpi_comm_dup
*
* Purpose: Duplicate an MPI communicator.
*
* Does not duplicate MPI_COMM_NULL. Instead, comm_new will
* be set to MPI_COMM_NULL directly.
*
* The new communicator is returned via the comm_new pointer.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5_mpi_comm_dup(MPI_Comm comm, MPI_Comm *comm_new)
{
herr_t ret_value = SUCCEED;
MPI_Comm comm_dup = MPI_COMM_NULL;
int mpi_code;
FUNC_ENTER_NOAPI(FAIL)
/* Check arguments */
if (!comm_new)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "comm_new cannot be NULL")
/* Handle MPI_COMM_NULL separately */
if (MPI_COMM_NULL == comm) {
/* Don't duplicate MPI_COMM_NULL since that's an error in MPI */
comm_dup = MPI_COMM_NULL;
}
else {
/* Duplicate the MPI communicator */
if (MPI_SUCCESS != (mpi_code = MPI_Comm_dup(comm, &comm_dup)))
HMPI_GOTO_ERROR(FAIL, "MPI_Comm_dup failed", mpi_code)
/* Set MPI_ERRORS_RETURN on comm_dup so that MPI failures are not fatal,
* and return codes can be checked and handled.
*/
if (MPI_SUCCESS != (mpi_code = MPI_Comm_set_errhandler(comm_dup, MPI_ERRORS_RETURN)))
HMPI_GOTO_ERROR(FAIL, "MPI_Errhandler_set failed", mpi_code)
}
/* Copy the new communicator to the return argument */
*comm_new = comm_dup;
done:
if (FAIL == ret_value) {
/* need to free anything created here */
if (MPI_COMM_NULL != comm_dup)
MPI_Comm_free(&comm_dup);
}
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_mpi_comm_dup() */
/*-------------------------------------------------------------------------
* Function: H5_mpi_info_dup
*
* Purpose: Duplicate an MPI info.
*
* If the info object is MPI_INFO_NULL, no duplicate
* is made but the same value assigned to the new info object
* handle.
*
* The new info is returned via the info_new pointer.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5_mpi_info_dup(MPI_Info info, MPI_Info *info_new)
{
herr_t ret_value = SUCCEED;
MPI_Info info_dup = MPI_INFO_NULL;
int mpi_code;
FUNC_ENTER_NOAPI(FAIL)
/* Check arguments */
if (!info_new)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "info_new cannot be NULL")
/* Duplicate the MPI info */
if (info == MPI_INFO_NULL) {
/* Don't duplicate MPI_INFO_NULL. Just copy it. */
info_dup = MPI_INFO_NULL;
}
else {
/* Duplicate the info */
if (MPI_SUCCESS != (mpi_code = MPI_Info_dup(info, &info_dup)))
HMPI_GOTO_ERROR(FAIL, "MPI_Info_dup failed", mpi_code)
}
/* Copy the new info to the return argument */
*info_new = info_dup;
done:
if (FAIL == ret_value) {
/* need to free anything created here */
if (MPI_INFO_NULL != info_dup)
MPI_Info_free(&info_dup);
}
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_mpi_info_dup() */
/*-------------------------------------------------------------------------
* Function: H5_mpi_comm_free
*
* Purpose: Free an MPI communicator.
*
* If comm is MPI_COMM_NULL this call does nothing.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5_mpi_comm_free(MPI_Comm *comm)
{
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI(FAIL)
/* Check arguments */
if (!comm)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "comm pointer cannot be NULL")
/* Free the communicator */
if (MPI_COMM_NULL != *comm)
MPI_Comm_free(comm);
*comm = MPI_COMM_NULL;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* End H5_mpi_comm_free() */
/*-------------------------------------------------------------------------
* Function: H5_mpi_info_free
*
* Purpose: Free the MPI info.
*
* If info is MPI_INFO_NULL this call does nothing.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5_mpi_info_free(MPI_Info *info)
{
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI(FAIL)
/* Check arguments */
if (!info)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "info pointer cannot be NULL")
/* Free the info */
if (MPI_INFO_NULL != *info)
MPI_Info_free(info);
*info = MPI_INFO_NULL;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* End H5_mpi_info_free() */
/*-------------------------------------------------------------------------
* Function: H5_mpi_comm_cmp
*
* Purpose: Compares two MPI communicators.
*
* Note that passing MPI_COMM_NULL to this function will not
* throw errors, unlike MPI_Comm_compare().
*
* We consider MPI communicators to be the "same" when the
* groups are identical. We don't care about the context
* since that will always be different as we call MPI_Comm_dup
* when we store the communicator in the fapl.
*
* The out parameter is a value like strcmp. The value is
* undefined when the return value is FAIL.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5_mpi_comm_cmp(MPI_Comm comm1, MPI_Comm comm2, int *result)
{
int mpi_code;
int mpi_result = MPI_IDENT;
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI(FAIL)
/* Check arguments */
if (!result)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "result cannot be NULL")
/* Set out parameter to something reasonable in case something goes wrong */
*result = 0;
/* Can't pass MPI_COMM_NULL to MPI_Comm_compare() so we have to handle
* it in special cases.
*/
if (MPI_COMM_NULL == comm1 && MPI_COMM_NULL == comm2) {
/* Special case of both communicators being MPI_COMM_NULL */
*result = 0;
}
else if (MPI_COMM_NULL == comm1 || MPI_COMM_NULL == comm2) {
/* Special case of one communicator being MPI_COMM_NULL */
*result = (MPI_Datatype)comm1 < (MPI_Datatype)comm2 ? -1 : 1;
}
else {
/* Normal communicator compare */
/* Compare the MPI communicators */
if (MPI_SUCCESS != (mpi_code = MPI_Comm_compare(comm1, comm2, &mpi_result)))
HMPI_GOTO_ERROR(FAIL, "MPI_Comm_compare failed", mpi_code)
/* Set the result
*
* The else clause should work regardless of whether MPI_Datatype is
* fundamentally an integer or a pointer.
*/
if (MPI_IDENT == mpi_result || MPI_CONGRUENT == mpi_result)
*result = 0;
else
*result = (MPI_Datatype)comm1 < (MPI_Datatype)comm2 ? -1 : 1;
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_mpi_comm_cmp() */
/*-------------------------------------------------------------------------
* Function: H5_mpi_info_cmp
*
* Purpose: Compares two MPI info objects.
*
* For our purposes, two mpi info objects are the "same" if
* they contain the same key-value pairs or are both
* MPI_INFO_NULL.
*
* The out parameter is a value like strcmp. The value is
* undefined when the return value is FAIL.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5_mpi_info_cmp(MPI_Info info1, MPI_Info info2, int *result)
{
hbool_t same = FALSE;
char *key = NULL;
char *value1 = NULL;
char *value2 = NULL;
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI(FAIL)
/* Check arguments */
if (!result)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "result cannot be NULL")
/* Check for MPI_INFO_NULL */
if (MPI_INFO_NULL == info1 && MPI_INFO_NULL == info2) {
/* Special case of both info objects being MPI_INFO_NULL */
same = TRUE;
}
else if (MPI_INFO_NULL == info1 || MPI_INFO_NULL == info2) {
/* Special case of one info object being MPI_INFO_NULL */
same = FALSE;
}
else {
int mpi_code;
int nkeys_1;
int nkeys_2;
/* Check if the number of keys is the same */
if (MPI_SUCCESS != (mpi_code = MPI_Info_get_nkeys(info1, &nkeys_1)))
HMPI_GOTO_ERROR(FAIL, "MPI_Info_get_nkeys failed", mpi_code)
if (MPI_SUCCESS != (mpi_code = MPI_Info_get_nkeys(info2, &nkeys_2)))
HMPI_GOTO_ERROR(FAIL, "MPI_Info_get_nkeys failed", mpi_code)
if (nkeys_1 != nkeys_2)
same = FALSE;
else if (0 == nkeys_1 && 0 == nkeys_2)
same = TRUE;
else {
int i;
int flag1 = -1;
int flag2 = -1;
/* Allocate buffers for iteration */
if (NULL == (key = (char *)H5MM_malloc(MPI_MAX_INFO_KEY * sizeof(char))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
if (NULL == (value1 = (char *)H5MM_malloc(MPI_MAX_INFO_VAL * sizeof(char))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
if (NULL == (value2 = (char *)H5MM_malloc(MPI_MAX_INFO_VAL * sizeof(char))))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
/* Iterate over the keys, comparing them */
for (i = 0; i < nkeys_1; i++) {
same = TRUE;
/* Memset the buffers to zero */
HDmemset(key, 0, MPI_MAX_INFO_KEY);
HDmemset(value1, 0, MPI_MAX_INFO_VAL);
HDmemset(value2, 0, MPI_MAX_INFO_VAL);
/* Get the nth key */
if (MPI_SUCCESS != (mpi_code = MPI_Info_get_nthkey(info1, i, key)))
HMPI_GOTO_ERROR(FAIL, "MPI_Info_get_nthkey failed", mpi_code)
/* Get the values */
if (MPI_SUCCESS != (mpi_code = MPI_Info_get(info1, key, MPI_MAX_INFO_VAL, value1, &flag1)))
HMPI_GOTO_ERROR(FAIL, "MPI_Info_get failed", mpi_code)
if (MPI_SUCCESS != (mpi_code = MPI_Info_get(info2, key, MPI_MAX_INFO_VAL, value2, &flag2)))
HMPI_GOTO_ERROR(FAIL, "MPI_Info_get failed", mpi_code)
/* Compare values and flags */
if (!flag1 || !flag2 || HDmemcmp(value1, value2, MPI_MAX_INFO_VAL)) {
same = FALSE;
break;
}
} /* end for */
} /* end else */
} /* end else */
/* Set the output value */
if (same)
*result = 0;
else
*result = (MPI_Datatype)info1 < (MPI_Datatype)info2 ? -1 : 1;
done:
if (key)
H5MM_xfree(key);
if (value1)
H5MM_xfree(value1);
if (value2)
H5MM_xfree(value2);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_mpi_info_cmp() */
#endif /* H5_HAVE_PARALLEL */
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