/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpiimpl.h"
#include "group.h"
/* -- Begin Profiling Symbol Block for routine MPI_Group_translate_ranks */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Group_translate_ranks = PMPI_Group_translate_ranks
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Group_translate_ranks MPI_Group_translate_ranks
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Group_translate_ranks as PMPI_Group_translate_ranks
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Group_translate_ranks(MPI_Group group1, int n, const int ranks1[], MPI_Group group2,
int ranks2[])
__attribute__ ((weak, alias("PMPI_Group_translate_ranks")));
#endif
/* -- End Profiling Symbol Block */
/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_Group_translate_ranks
#define MPI_Group_translate_ranks PMPI_Group_translate_ranks
#undef FUNCNAME
#define FUNCNAME MPIR_Group_translate_ranks_impl
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Group_translate_ranks_impl(MPIR_Group * gp1, int n, const int ranks1[],
MPIR_Group * gp2, int ranks2[])
{
int mpi_errno = MPI_SUCCESS;
int i, g2_idx, l1_pid, l2_pid;
MPL_DBG_MSG_S(MPIR_DBG_OTHER, VERBOSE, "gp2->is_local_dense_monotonic=%s",
(gp2->is_local_dense_monotonic ? "TRUE" : "FALSE"));
/* Initialize the output ranks */
for (i = 0; i < n; i++)
ranks2[i] = MPI_UNDEFINED;
if (gp2->size > 0 && gp2->is_local_dense_monotonic) {
/* g2 probably == group_of(MPI_COMM_WORLD); use fast, constant-time lookup */
int lpid_offset = gp2->lrank_to_lpid[0].lpid;
MPIR_Assert(lpid_offset >= 0);
for (i = 0; i < n; ++i) {
int g1_lpid;
if (ranks1[i] == MPI_PROC_NULL) {
ranks2[i] = MPI_PROC_NULL;
continue;
}
/* "adjusted" lpid from g1 */
g1_lpid = gp1->lrank_to_lpid[ranks1[i]].lpid - lpid_offset;
if ((g1_lpid >= 0) && (g1_lpid < gp2->size)) {
ranks2[i] = g1_lpid;
}
/* else leave UNDEFINED */
}
} else {
/* general, slow path; lookup time is dependent on the user-provided rank values! */
g2_idx = gp2->idx_of_first_lpid;
if (g2_idx < 0) {
MPII_Group_setup_lpid_list(gp2);
g2_idx = gp2->idx_of_first_lpid;
}
if (g2_idx >= 0) {
/* g2_idx can be < 0 if the g2 group is empty */
l2_pid = gp2->lrank_to_lpid[g2_idx].lpid;
for (i = 0; i < n; i++) {
if (ranks1[i] == MPI_PROC_NULL) {
ranks2[i] = MPI_PROC_NULL;
continue;
}
l1_pid = gp1->lrank_to_lpid[ranks1[i]].lpid;
/* Search for this l1_pid in group2. Use the following
* optimization: start from the last position in the lpid list
* if possible. A more sophisticated version could use a
* tree based or even hashed search to speed the translation. */
if (l1_pid < l2_pid || g2_idx < 0) {
/* Start over from the beginning */
g2_idx = gp2->idx_of_first_lpid;
l2_pid = gp2->lrank_to_lpid[g2_idx].lpid;
}
while (g2_idx >= 0 && l1_pid > l2_pid) {
g2_idx = gp2->lrank_to_lpid[g2_idx].next_lpid;
if (g2_idx >= 0)
l2_pid = gp2->lrank_to_lpid[g2_idx].lpid;
else
l2_pid = -1;
}
if (l1_pid == l2_pid)
ranks2[i] = g2_idx;
}
}
}
return mpi_errno;
}
#endif
#undef FUNCNAME
#define FUNCNAME MPI_Group_translate_ranks
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
/*@
MPI_Group_translate_ranks - Translates the ranks of processes in one group to
those in another group
Input Parameters:
+ group1 - group1 (handle)
. n - number of ranks in 'ranks1' and 'ranks2' arrays (integer)
. ranks1 - array of zero or more valid ranks in 'group1'
- group2 - group2 (handle)
Output Parameters:
. ranks2 - array of corresponding ranks in group2, 'MPI_UNDEFINED' when no
correspondence exists.
As a special case (see the MPI-2 errata), if the input rank is
'MPI_PROC_NULL', 'MPI_PROC_NULL' is given as the output rank.
.N ThreadSafe
.N Fortran
.N Errors
.N MPI_SUCCESS
@*/
int MPI_Group_translate_ranks(MPI_Group group1, int n, const int ranks1[],
MPI_Group group2, int ranks2[])
{
int mpi_errno = MPI_SUCCESS;
MPIR_Group *group_ptr1 = NULL;
MPIR_Group *group_ptr2 = NULL;
MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_GROUP_TRANSLATE_RANKS);
MPIR_ERRTEST_INITIALIZED_ORDIE();
/* The routines that setup the group data structures must be executed
* within a mutex. As most of the group routines are not performance
* critical, we simple run these routines within the SINGLE_CS */
MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_GROUP_TRANSLATE_RANKS);
/* Validate parameters, especially handles needing to be converted */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
MPIR_ERRTEST_GROUP(group1, mpi_errno);
MPIR_ERRTEST_GROUP(group2, mpi_errno);
}
MPID_END_ERROR_CHECKS;
}
#endif
/* Convert MPI object handles to object pointers */
MPIR_Group_get_ptr(group1, group_ptr1);
MPIR_Group_get_ptr(group2, group_ptr2);
/* Validate parameters and objects (post conversion) */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
/* Validate group_ptr */
MPIR_Group_valid_ptr(group_ptr1, mpi_errno);
MPIR_Group_valid_ptr(group_ptr2, mpi_errno);
/* If either group_ptr is not valid, it will be reset to null */
MPIR_ERRTEST_ARGNEG(n, "n", mpi_errno);
if (group_ptr1) {
/* Check that the rank entries are valid */
int size1 = group_ptr1->size;
int i;
for (i = 0; i < n; i++) {
if ((ranks1[i] < 0 && ranks1[i] != MPI_PROC_NULL) || ranks1[i] >= size1) {
mpi_errno = MPIR_Err_create_code(MPI_SUCCESS,
MPIR_ERR_RECOVERABLE, FCNAME, __LINE__,
MPI_ERR_RANK,
"**rank", "**rank %d %d",
ranks1[i], size1);
goto fn_fail;
}
}
}
MPIR_ERRTEST_ARGNULL(ranks2, "ranks2", mpi_errno);
}
MPID_END_ERROR_CHECKS;
}
#endif /* HAVE_ERROR_CHECKING */
/* ... body of routine ... */
mpi_errno = MPIR_Group_translate_ranks_impl(group_ptr1, n, ranks1, group_ptr2, ranks2);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
/* ... end of body of routine ... */
fn_exit:
MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_GROUP_TRANSLATE_RANKS);
MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
return mpi_errno;
/* --BEGIN ERROR HANDLING-- */
fn_fail:
{
mpi_errno =
MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,
"**mpi_group_translate_ranks",
"**mpi_group_translate_ranks %G %d %p %G %p", group1, n, ranks1,
group2, ranks2);
}
mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);
goto fn_exit;
/* --END ERROR HANDLING-- */
}