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9613b3176c
openmpi/ompi/mca/coll/tuned/coll_tuned_reduce_scatter.c
Ralph Castain 9613b3176c Effectively revert the orte_output system and return to direct use of opal_output at all levels. Retain the orte_show_help subsystem to allow aggregation of show_help messages at the HNP. 
After much work by Jeff and myself, and quite a lot of discussion, it has become clear that we simply cannot resolve the infinite loops caused by RML-involved subsystems calling orte_output. The original rationale for the change to orte_output has also been reduced by shifting the output of XML-formatted vs human readable messages to an alternative approach.

I have globally replaced the orte_output/ORTE_OUTPUT calls in the code base, as well as the corresponding .h file name. I have test compiled and run this on the various environments within my reach, so hopefully this will prove minimally disruptive.

This commit was SVN r18619.
2008-06-09 14:53:58 +00:00

745 строки
28 KiB
C
Исходник Ответственный История

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2006 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/datatype/datatype.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/coll/coll.h"
#include "ompi/mca/coll/base/coll_tags.h"
#include "ompi/mca/pml/pml.h"
#include "ompi/op/op.h"
#include "coll_tuned.h"
#include "coll_tuned_topo.h"
/*******************************************************************************
* ompi_coll_tuned_reduce_scatter_intra_nonoverlapping
*
* This function just calls a reduce to rank 0, followed by an
* appropriate scatterv call.
*/
int ompi_coll_tuned_reduce_scatter_intra_nonoverlapping(void *sbuf, void *rbuf,
int *rcounts,
struct ompi_datatype_t *dtype,
struct ompi_op_t *op,
struct ompi_communicator_t *comm,
struct mca_coll_base_module_1_1_0_t *module)
{
int err, i;
int rank, size;
int total_count;
int *displs = NULL;
char *tmprbuf = NULL;
char *tmprbuf_free = NULL;
const int root = 0;
rank = ompi_comm_rank(comm);
size = ompi_comm_size(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:reduce_scatter_intra_nonoverlapping, rank %d", rank));
for (i = 0, total_count = 0; i < size; i++) { total_count += rcounts[i]; }
/* Reduce to rank 0 (root) and scatterv */
tmprbuf = (char*) rbuf;
if (MPI_IN_PLACE == sbuf) {
/* rbuf on root (0) is big enough to hold whole data */
if (root == rank) {
err = comm->c_coll.coll_reduce (MPI_IN_PLACE, tmprbuf, total_count,
dtype, op, root, comm, module);
} else {
err = comm->c_coll.coll_reduce(tmprbuf, NULL, total_count,
dtype, op, root, comm, module);
}
} else {
if (root == rank) {
/* We must allocate temporary receive buffer on root to ensure that
rbuf is big enough */
ptrdiff_t lb, extent, tlb, textent;
ompi_ddt_get_extent(dtype, &lb, &extent);
ompi_ddt_get_true_extent(dtype, &tlb, &textent);
tmprbuf_free = (char*) malloc(textent + (total_count - 1)*extent);
tmprbuf = tmprbuf_free - lb;
}
err = comm->c_coll.coll_reduce (sbuf, tmprbuf, total_count,
dtype, op, root, comm, module);
}
if (MPI_SUCCESS != err) {
if (NULL != tmprbuf_free) free(tmprbuf_free);
return err;
}
displs = (int*) malloc(size * sizeof(int));
displs[0] = 0;
for (i = 1; i < size; i++) {
displs[i] = displs[i-1] + rcounts[i-1];
}
err = comm->c_coll.coll_scatterv (tmprbuf, rcounts, displs, dtype,
rbuf, rcounts[rank], dtype,
root, comm, module);
free(displs);
if (NULL != tmprbuf_free) free(tmprbuf_free);
return err;
}
/*
* Recursive-halving function is (*mostly*) copied from the BASIC coll module.
* I have removed the part which handles "large" message sizes
* (non-overlapping version of reduce_Scatter).
*/
/* copied function (with appropriate renaming) starts here */
/*
* reduce_scatter_intra_basic_recursivehalving
*
* Function: - reduce scatter implementation using recursive-halving
* algorithm
* Accepts: - same as MPI_Reduce_scatter()
* Returns: - MPI_SUCCESS or error code
* Limitation: - Works only for commutative operations.
*/
int
ompi_coll_tuned_reduce_scatter_intra_basic_recursivehalving(void *sbuf,
void *rbuf,
int *rcounts,
struct ompi_datatype_t *dtype,
struct ompi_op_t *op,
struct ompi_communicator_t *comm,
struct mca_coll_base_module_1_1_0_t *module)
{
int i, rank, size, count, err = OMPI_SUCCESS;
int tmp_size = 1, remain = 0, tmp_rank;
int *disps = NULL;
ptrdiff_t true_lb, true_extent, lb, extent, buf_size;
char *recv_buf = NULL, *recv_buf_free = NULL;
char *result_buf = NULL, *result_buf_free = NULL;
/* Initialize */
rank = ompi_comm_rank(comm);
size = ompi_comm_size(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:reduce_scatter_intra_basic_recursivehalving, rank %d", rank));
/* Find displacements and the like */
disps = (int*) malloc(sizeof(int) * size);
if (NULL == disps) return OMPI_ERR_OUT_OF_RESOURCE;
disps[0] = 0;
for (i = 0; i < (size - 1); ++i) {
disps[i + 1] = disps[i] + rcounts[i];
}
count = disps[size - 1] + rcounts[size - 1];
/* short cut the trivial case */
if (0 == count) {
free(disps);
return OMPI_SUCCESS;
}
/* get datatype information */
ompi_ddt_get_extent(dtype, &lb, &extent);
ompi_ddt_get_true_extent(dtype, &true_lb, &true_extent);
buf_size = true_extent + (count - 1) * extent;
/* Handle MPI_IN_PLACE */
if (MPI_IN_PLACE == sbuf) {
sbuf = rbuf;
}
/* Allocate temporary receive buffer. */
recv_buf_free = (char*) malloc(buf_size);
recv_buf = recv_buf_free - lb;
if (NULL == recv_buf_free) {
err = OMPI_ERR_OUT_OF_RESOURCE;
goto cleanup;
}
/* allocate temporary buffer for results */
result_buf_free = (char*) malloc(buf_size);
result_buf = result_buf_free - lb;
/* copy local buffer into the temporary results */
err = ompi_ddt_sndrcv(sbuf, count, dtype, result_buf, count, dtype);
if (OMPI_SUCCESS != err) goto cleanup;
/* figure out power of two mapping: grow until larger than
comm size, then go back one, to get the largest power of
two less than comm size */
while (tmp_size <= size) tmp_size <<= 1;
tmp_size >>= 1;
remain = size - tmp_size;
/* If comm size is not a power of two, have the first "remain"
procs with an even rank send to rank + 1, leaving a power of
two procs to do the rest of the algorithm */
if (rank < 2 * remain) {
if ((rank & 1) == 0) {
err = MCA_PML_CALL(send(result_buf, count, dtype, rank + 1,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
MCA_PML_BASE_SEND_STANDARD,
comm));
if (OMPI_SUCCESS != err) goto cleanup;
/* we don't participate from here on out */
tmp_rank = -1;
} else {
err = MCA_PML_CALL(recv(recv_buf, count, dtype, rank - 1,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
comm, MPI_STATUS_IGNORE));
/* integrate their results into our temp results */
ompi_op_reduce(op, recv_buf, result_buf, count, dtype);
/* adjust rank to be the bottom "remain" ranks */
tmp_rank = rank / 2;
}
} else {
/* just need to adjust rank to show that the bottom "even
remain" ranks dropped out */
tmp_rank = rank - remain;
}
/* For ranks not kicked out by the above code, perform the
recursive halving */
if (tmp_rank >= 0) {
int *tmp_disps = NULL, *tmp_rcounts = NULL;
int mask, send_index, recv_index, last_index;
/* recalculate disps and rcounts to account for the
special "remainder" processes that are no longer doing
anything */
tmp_rcounts = (int*) malloc(tmp_size * sizeof(int));
if (NULL == tmp_rcounts) {
err = OMPI_ERR_OUT_OF_RESOURCE;
goto cleanup;
}
tmp_disps = (int*) malloc(tmp_size * sizeof(int));
if (NULL == tmp_disps) {
free(tmp_rcounts);
err = OMPI_ERR_OUT_OF_RESOURCE;
goto cleanup;
}
for (i = 0 ; i < tmp_size ; ++i) {
if (i < remain) {
/* need to include old neighbor as well */
tmp_rcounts[i] = rcounts[i * 2 + 1] + rcounts[i * 2];
} else {
tmp_rcounts[i] = rcounts[i + remain];
}
}
tmp_disps[0] = 0;
for (i = 0; i < tmp_size - 1; ++i) {
tmp_disps[i + 1] = tmp_disps[i] + tmp_rcounts[i];
}
/* do the recursive halving communication. Don't use the
dimension information on the communicator because I
think the information is invalidated by our "shrinking"
of the communicator */
mask = tmp_size >> 1;
send_index = recv_index = 0;
last_index = tmp_size;
while (mask > 0) {
int tmp_peer, peer, send_count, recv_count;
struct ompi_request_t *request;
tmp_peer = tmp_rank ^ mask;
peer = (tmp_peer < remain) ? tmp_peer * 2 + 1 : tmp_peer + remain;
/* figure out if we're sending, receiving, or both */
send_count = recv_count = 0;
if (tmp_rank < tmp_peer) {
send_index = recv_index + mask;
for (i = send_index ; i < last_index ; ++i) {
send_count += tmp_rcounts[i];
}
for (i = recv_index ; i < send_index ; ++i) {
recv_count += tmp_rcounts[i];
}
} else {
recv_index = send_index + mask;
for (i = send_index ; i < recv_index ; ++i) {
send_count += tmp_rcounts[i];
}
for (i = recv_index ; i < last_index ; ++i) {
recv_count += tmp_rcounts[i];
}
}
/* actual data transfer. Send from result_buf,
receive into recv_buf */
if (send_count > 0 && recv_count != 0) {
err = MCA_PML_CALL(irecv(recv_buf + tmp_disps[recv_index] * extent,
recv_count, dtype, peer,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
comm, &request));
if (OMPI_SUCCESS != err) {
free(tmp_rcounts);
free(tmp_disps);
goto cleanup;
}
}
if (recv_count > 0 && send_count != 0) {
err = MCA_PML_CALL(send(result_buf + tmp_disps[send_index] * extent,
send_count, dtype, peer,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
MCA_PML_BASE_SEND_STANDARD,
comm));
if (OMPI_SUCCESS != err) {
free(tmp_rcounts);
free(tmp_disps);
goto cleanup;
}
}
if (send_count > 0 && recv_count != 0) {
err = ompi_request_wait(&request, MPI_STATUS_IGNORE);
if (OMPI_SUCCESS != err) {
free(tmp_rcounts);
free(tmp_disps);
goto cleanup;
}
}
/* if we received something on this step, push it into
the results buffer */
if (recv_count > 0) {
ompi_op_reduce(op,
recv_buf + tmp_disps[recv_index] * extent,
result_buf + tmp_disps[recv_index] * extent,
recv_count, dtype);
}
/* update for next iteration */
send_index = recv_index;
last_index = recv_index + mask;
mask >>= 1;
}
/* copy local results from results buffer into real receive buffer */
if (0 != rcounts[rank]) {
err = ompi_ddt_sndrcv(result_buf + disps[rank] * extent,
rcounts[rank], dtype,
rbuf, rcounts[rank], dtype);
if (OMPI_SUCCESS != err) {
free(tmp_rcounts);
free(tmp_disps);
goto cleanup;
}
}
free(tmp_rcounts);
free(tmp_disps);
}
/* Now fix up the non-power of two case, by having the odd
procs send the even procs the proper results */
if (rank < 2 * remain) {
if ((rank & 1) == 0) {
if (rcounts[rank]) {
err = MCA_PML_CALL(recv(rbuf, rcounts[rank], dtype, rank + 1,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
comm, MPI_STATUS_IGNORE));
if (OMPI_SUCCESS != err) goto cleanup;
}
} else {
if (rcounts[rank - 1]) {
err = MCA_PML_CALL(send(result_buf + disps[rank - 1] * extent,
rcounts[rank - 1], dtype, rank - 1,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
MCA_PML_BASE_SEND_STANDARD,
comm));
if (OMPI_SUCCESS != err) goto cleanup;
}
}
}
cleanup:
if (NULL != disps) free(disps);
if (NULL != recv_buf_free) free(recv_buf_free);
if (NULL != result_buf_free) free(result_buf_free);
return err;
}
/* copied function (with appropriate renaming) ends here */
/*
* ompi_coll_tuned_reduce_scatter_intra_ring
*
* Function: Ring algorithm for reduce_scatter operation
* Accepts: Same as MPI_Reduce_scatter()
* Returns: MPI_SUCCESS or error code
*
* Description: Implements ring algorithm for reduce_scatter:
* the block sizes defined in rcounts are exchanged and
8 updated until they reach proper destination.
* Algorithm requires 2 * max(rcounts) extra buffering
*
* Limitations: The algorithm DOES NOT preserve order of operations so it
* can be used only for commutative operations.
* Example on 5 nodes:
* Initial state
* # 0 1 2 3 4
* [00] [10] -> [20] [30] [40]
* [01] [11] [21] -> [31] [41]
* [02] [12] [22] [32] -> [42]
* -> [03] [13] [23] [33] [43] --> ..
* [04] -> [14] [24] [34] [44]
*
* COMPUTATION PHASE
* Step 0: rank r sends block (r-1) to rank (r+1) and
* receives block (r+1) from rank (r-1) [with wraparound].
* # 0 1 2 3 4
* [00] [10] [10+20] -> [30] [40]
* [01] [11] [21] [21+31] -> [41]
* -> [02] [12] [22] [32] [32+42] -->..
* [43+03] -> [13] [23] [33] [43]
* [04] [04+14] -> [24] [34] [44]
*
* Step 1:
* # 0 1 2 3 4
* [00] [10] [10+20] [10+20+30] -> [40]
* -> [01] [11] [21] [21+31] [21+31+41] ->
* [32+42+02] -> [12] [22] [32] [32+42]
* [03] [43+03+13] -> [23] [33] [43]
* [04] [04+14] [04+14+24] -> [34] [44]
*
* Step 2:
* # 0 1 2 3 4
* -> [00] [10] [10+20] [10+20+30] [10+20+30+40] ->
* [21+31+41+01]-> [11] [21] [21+31] [21+31+41]
* [32+42+02] [32+42+02+12]-> [22] [32] [32+42]
* [03] [43+03+13] [43+03+13+23]-> [33] [43]
* [04] [04+14] [04+14+24] [04+14+24+34] -> [44]
*
* Step 3:
* # 0 1 2 3 4
* [10+20+30+40+00] [10] [10+20] [10+20+30] [10+20+30+40]
* [21+31+41+01] [21+31+41+01+11] [21] [21+31] [21+31+41]
* [32+42+02] [32+42+02+12] [32+42+02+12+22] [32] [32+42]
* [03] [43+03+13] [43+03+13+23] [43+03+13+23+33] [43]
* [04] [04+14] [04+14+24] [04+14+24+34] [04+14+24+34+44]
* DONE :)
*
*/
int
ompi_coll_tuned_reduce_scatter_intra_ring(void *sbuf, void *rbuf, int *rcounts,
struct ompi_datatype_t *dtype,
struct ompi_op_t *op,
struct ompi_communicator_t *comm,
struct mca_coll_base_module_1_1_0_t *module)
{
int ret, line;
int rank, size, i, k, recv_from, send_to;
int total_count, max_block_count;
int inbi;
int *displs = NULL;
size_t typelng;
char *tmpsend = NULL, *tmprecv = NULL;
char *inbuf_free[2] = {NULL, NULL};
char *inbuf[2] = {NULL, NULL};
char *accumbuf = NULL, *accumbuf_free = NULL;
ptrdiff_t true_lb, true_extent, lb, extent, max_real_segsize;
ompi_request_t *reqs[2] = {NULL, NULL};
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,
"coll:tuned:reduce_scatter_intra_ring rank %d, size %d",
rank, size));
/* Determine the maximum number of elements per node,
corresponding block size, and displacements array.
*/
displs = (int*) malloc(size * sizeof(int));
if (NULL == displs) { ret = -1; line = __LINE__; goto error_hndl; }
displs[0] = 0;
total_count = rcounts[0];
max_block_count = rcounts[0];
for (i = 1; i < size; i++) {
displs[i] = total_count;
total_count += rcounts[i];
if (max_block_count < rcounts[i]) max_block_count = rcounts[i];
}
/* Special case for size == 1 */
if (1 == size) {
if (MPI_IN_PLACE != sbuf) {
ret = ompi_ddt_copy_content_same_ddt(dtype, total_count,
(char*)rbuf, (char*)sbuf);
if (ret < 0) { line = __LINE__; goto error_hndl; }
}
free(displs);
return MPI_SUCCESS;
}
/* Allocate and initialize temporary buffers, we need:
- a temporary buffer to perform reduction (size total_count) since
rbuf can be of rcounts[rank] size.
- up to two temporary buffers used for communication/computation overlap.
*/
ret = ompi_ddt_get_extent(dtype, &lb, &extent);
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
ret = ompi_ddt_get_true_extent(dtype, &true_lb, &true_extent);
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
ret = ompi_ddt_type_size( dtype, &typelng);
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
max_real_segsize = true_extent + (max_block_count - 1) * extent;
accumbuf_free = (char*)malloc(true_extent + (total_count - 1) * extent);
if (NULL == accumbuf_free) { ret = -1; line = __LINE__; goto error_hndl; }
accumbuf = accumbuf_free - lb;
inbuf_free[0] = (char*)malloc(max_real_segsize);
if (NULL == inbuf_free[0]) { ret = -1; line = __LINE__; goto error_hndl; }
inbuf[0] = inbuf_free[0] - lb;
if (size > 2) {
inbuf_free[1] = (char*)malloc(max_real_segsize);
if (NULL == inbuf_free[1]) { ret = -1; line = __LINE__; goto error_hndl; }
inbuf[1] = inbuf_free[1] - lb;
}
/* Handle MPI_IN_PLACE */
if (MPI_IN_PLACE != sbuf) {
ret = ompi_ddt_copy_content_same_ddt(dtype, total_count,
accumbuf, (char*)sbuf);
if (ret < 0) { line = __LINE__; goto error_hndl; }
}
/* Computation loop */
/*
For each of the remote nodes:
- post irecv for block (r-2) from (r-1) with wrap around
- send block (r-1) to (r+1)
- in loop for every step k = 2 .. n
- post irecv for block (r - 1 + n - k) % n
- wait on block (r + n - k) % n to arrive
- compute on block (r + n - k ) % n
- send block (r + n - k) % n
- wait on block (r)
- compute on block (r)
- copy block (r) to rbuf
Note that we must be careful when computing the begining of buffers and
for send operations and computation we must compute the exact block size.
*/
send_to = (rank + 1) % size;
recv_from = (rank + size - 1) % size;
inbi = 0;
/* Initialize first receive from the neighbor on the left */
ret = MCA_PML_CALL(irecv(inbuf[inbi], max_block_count, dtype, recv_from,
MCA_COLL_BASE_TAG_REDUCE_SCATTER, comm,
&reqs[inbi]));
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
tmpsend = accumbuf + displs[recv_from] * extent;
ret = MCA_PML_CALL(send(tmpsend, rcounts[recv_from], dtype, send_to,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
MCA_PML_BASE_SEND_STANDARD, comm));
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
for (k = 2; k < size; k++) {
const int prevblock = (rank + size - k) % size;
inbi = inbi ^ 0x1;
/* Post irecv for the current block */
ret = MCA_PML_CALL(irecv(inbuf[inbi], max_block_count, dtype, recv_from,
MCA_COLL_BASE_TAG_REDUCE_SCATTER, comm,
&reqs[inbi]));
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
/* Wait on previous block to arrive */
ret = ompi_request_wait(&reqs[inbi ^ 0x1], MPI_STATUS_IGNORE);
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
/* Apply operation on previous block: result goes to rbuf
rbuf[prevblock] = inbuf[inbi ^ 0x1] (op) rbuf[prevblock]
*/
tmprecv = accumbuf + displs[prevblock] * extent;
ompi_op_reduce(op, inbuf[inbi ^ 0x1], tmprecv, rcounts[prevblock], dtype);
/* send previous block to send_to */
ret = MCA_PML_CALL(send(tmprecv, rcounts[prevblock], dtype, send_to,
MCA_COLL_BASE_TAG_REDUCE_SCATTER,
MCA_PML_BASE_SEND_STANDARD, comm));
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
}
/* Wait on the last block to arrive */
ret = ompi_request_wait(&reqs[inbi], MPI_STATUS_IGNORE);
if (MPI_SUCCESS != ret) { line = __LINE__; goto error_hndl; }
/* Apply operation on the last block (my block)
rbuf[rank] = inbuf[inbi] (op) rbuf[rank] */
tmprecv = accumbuf + displs[rank] * extent;
ompi_op_reduce(op, inbuf[inbi], tmprecv, rcounts[rank], dtype);
/* Copy result from tmprecv to rbuf */
ret = ompi_ddt_copy_content_same_ddt(dtype, rcounts[rank], (char *) rbuf, tmprecv);
if (ret < 0) { line = __LINE__; goto error_hndl; }
if (NULL != displs) free(displs);
if (NULL != accumbuf_free) free(accumbuf_free);
if (NULL != inbuf_free[0]) free(inbuf_free[0]);
if (NULL != inbuf_free[1]) free(inbuf_free[1]);
return MPI_SUCCESS;
error_hndl:
OPAL_OUTPUT((ompi_coll_tuned_stream, "%s:%4d\tRank %d Error occurred %d\n",
__FILE__, line, rank, ret));
if (NULL != displs) free(displs);
if (NULL != accumbuf_free) free(accumbuf_free);
if (NULL != inbuf_free[0]) free(inbuf_free[0]);
if (NULL != inbuf_free[1]) free(inbuf_free[1]);
return ret;
}
/**
* The following are used by dynamic and forced rules
*
* publish details of each algorithm and if its forced/fixed/locked in
* as you add methods/algorithms you must update this and the query/map routines
*
* this routine is called by the component only
* this makes sure that the mca parameters are set to their initial values and
* perms module does not call this they call the forced_getvalues routine
* instead
*/
int ompi_coll_tuned_reduce_scatter_intra_check_forced_init (coll_tuned_force_algorithm_mca_param_indices_t *mca_param_indices)
{
int rc, requested_alg, max_alg = 3;
ompi_coll_tuned_forced_max_algorithms[REDUCESCATTER] = max_alg;
rc = mca_base_param_reg_int (&mca_coll_tuned_component.super.collm_version,
"reduce_scatter_algorithm_count",
"Number of reduce_scatter algorithms available",
false, true, max_alg, NULL);
mca_param_indices->algorithm_param_index
= mca_base_param_reg_int(&mca_coll_tuned_component.super.collm_version,
"reduce_scatter_algorithm",
"Which reduce reduce_scatter algorithm is used. Can be locked down to choice of: 0 ignore, 1 non-overlapping (Reduce + Scatterv), 2 recursive halving, 3 ring",
false, false, 0, NULL);
mca_base_param_lookup_int(mca_param_indices->algorithm_param_index, &(requested_alg));
if( requested_alg > max_alg ) {
if( 0 == ompi_comm_rank( MPI_COMM_WORLD ) ) {
opal_output( 0, "Reduce_scatter algorithm #%d is not available (range [0..%d]). Switching back to ignore(0)\n",
requested_alg, max_alg );
}
mca_base_param_set_int( mca_param_indices->algorithm_param_index, 0);
}
mca_param_indices->segsize_param_index
= mca_base_param_reg_int(&mca_coll_tuned_component.super.collm_version,
"reduce_scatter_algorithm_segmentsize",
"Segment size in bytes used by default for reduce_scatter algorithms. Only has meaning if algorithm is forced and supports segmenting. 0 bytes means no segmentation.",
false, false, 0, NULL);
mca_param_indices->tree_fanout_param_index
= mca_base_param_reg_int(&mca_coll_tuned_component.super.collm_version,
"reduce_scatter_algorithm_tree_fanout",
"Fanout for n-tree used for reduce_scatter algorithms. Only has meaning if algorithm is forced and supports n-tree topo based operation.",
false, false,
ompi_coll_tuned_init_tree_fanout, /* get system wide default */
NULL);
mca_param_indices->chain_fanout_param_index
= mca_base_param_reg_int(&mca_coll_tuned_component.super.collm_version,
"reduce_scatter_algorithm_chain_fanout",
"Fanout for chains used for reduce_scatter algorithms. Only has meaning if algorithm is forced and supports chain topo based operation.",
false, false,
ompi_coll_tuned_init_chain_fanout, /* get system wide default */
NULL);
return (MPI_SUCCESS);
}
int ompi_coll_tuned_reduce_scatter_intra_do_forced(void *sbuf, void* rbuf,
int *rcounts,
struct ompi_datatype_t *dtype,
struct ompi_op_t *op,
struct ompi_communicator_t *comm,
struct mca_coll_base_module_1_1_0_t *module)
{
mca_coll_tuned_module_t *tuned_module = (mca_coll_tuned_module_t*) module;
mca_coll_tuned_comm_t *data = tuned_module->tuned_data;
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:reduce_scatter_intra_do_forced selected algorithm %d",
data->user_forced[REDUCESCATTER].algorithm));
switch (data->user_forced[REDUCESCATTER].algorithm) {
case (0): return ompi_coll_tuned_reduce_scatter_intra_dec_fixed (sbuf, rbuf, rcounts,
dtype, op, comm, module);
case (1): return ompi_coll_tuned_reduce_scatter_intra_nonoverlapping(sbuf, rbuf, rcounts,
dtype, op, comm, module);
case (2): return ompi_coll_tuned_reduce_scatter_intra_basic_recursivehalving(sbuf, rbuf, rcounts,
dtype, op, comm, module);
case (3): return ompi_coll_tuned_reduce_scatter_intra_ring (sbuf, rbuf, rcounts,
dtype, op, comm, module);
default:
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:reduce_scatter_intra_do_forced attempt to select algorithm %d when only 0-%d is valid?",
data->user_forced[REDUCESCATTER].algorithm, ompi_coll_tuned_forced_max_algorithms[REDUCESCATTER]));
return (MPI_ERR_ARG);
} /* switch */
}
int ompi_coll_tuned_reduce_scatter_intra_do_this(void *sbuf, void* rbuf,
int *rcounts,
struct ompi_datatype_t *dtype,
struct ompi_op_t *op,
struct ompi_communicator_t *comm,
struct mca_coll_base_module_1_1_0_t *module,
int algorithm, int faninout, int segsize)
{
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:reduce_scatter_intra_do_this selected algorithm %d topo faninout %d segsize %d",
algorithm, faninout, segsize));
switch (algorithm) {
case (0): return ompi_coll_tuned_reduce_scatter_intra_dec_fixed (sbuf, rbuf, rcounts,
dtype, op, comm, module);
case (1): return ompi_coll_tuned_reduce_scatter_intra_nonoverlapping(sbuf, rbuf, rcounts,
dtype, op, comm, module);
case (2): return ompi_coll_tuned_reduce_scatter_intra_basic_recursivehalving(sbuf, rbuf, rcounts,
dtype, op, comm, module);
case (3): return ompi_coll_tuned_reduce_scatter_intra_ring (sbuf, rbuf, rcounts,
dtype, op, comm, module);
default:
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:reduce_scatter_intra_do_this attempt to select algorithm %d when only 0-%d is valid?",
algorithm, ompi_coll_tuned_forced_max_algorithms[REDUCESCATTER]));
return (MPI_ERR_ARG);
} /* switch */
}
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