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openmpi/ompi/mca/coll/tuned/coll_tuned_alltoall.c
Jelena Pjesivac-Grbovic b608887466 Adding variant of linear alltoall algorithm where the number of 
outstanding requests can be limited using mca parameters.
The implementation passed Intel, IMB-3.2, and mpi_test_suite tests over
TCP and MX up to 128 processes (64 nodes), on both 32-bit and 64-bit machines.
It is not activated by default, but it should be useful for really large
communicator sizes.

This commit was SVN r13720.
2007-02-20 04:25:00 +00:00

713 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"
#include "coll_tuned_util.h"
int ompi_coll_tuned_alltoall_intra_pairwise(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void* rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm)
{
int line = -1, err = 0;
int rank, size, step;
int sendto, recvfrom;
void * tmpsend, *tmprecv;
ptrdiff_t lb, sext, rext;
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:alltoall_intra_pairwise rank %d", rank));
err = ompi_ddt_get_extent (sdtype, &lb, &sext);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
err = ompi_ddt_get_extent (rdtype, &lb, &rext);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* Perform pairwise exchange - starting from 1 so the local copy is last */
for (step = 1; step < size+1; step++) {
/* who do we talk to in this step? */
sendto = (rank+step)%size;
recvfrom = (rank+size-step)%size;
/* where from are we sending and where from are we receiving actual data ? */
tmpsend = (char*)sbuf+sendto*sext*scount;
tmprecv = (char*)rbuf+recvfrom*rext*rcount;
/* send and receive */
err = ompi_coll_tuned_sendrecv( tmpsend, scount, sdtype, sendto, MCA_COLL_BASE_TAG_ALLTOALL,
tmprecv, rcount, rdtype, recvfrom, MCA_COLL_BASE_TAG_ALLTOALL,
comm, MPI_STATUS_IGNORE, rank);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
}
return MPI_SUCCESS;
err_hndl:
OPAL_OUTPUT((ompi_coll_tuned_stream,"%s:%4d\tError occurred %d, rank %2d", __FILE__,line,err,rank));
return err;
}
int ompi_coll_tuned_alltoall_intra_bruck(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void* rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm)
{
int i, k, line = -1;
int rank, size;
int sendto, recvfrom, distance, *displs=NULL, *blen=NULL;
int maxpacksize, packsize, position;
char * tmpbuf=NULL, *packbuf=NULL;
ptrdiff_t lb, sext, rext;
int err = 0;
int weallocated = 0;
MPI_Datatype iddt;
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:alltoall_intra_bruck rank %d", rank));
err = ompi_ddt_get_extent (sdtype, &lb, &sext);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
err = ompi_ddt_get_extent (rdtype, &lb, &rext);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
#ifdef blahblah
/* try and SAVE memory by using the data segment hung off the communicator if possible */
if (comm->c_coll_selected_data->mcct_num_reqs >= size) {
/* we have enought preallocated for displments and lengths */
displs = (int*) comm->c_coll_basic_data->mcct_reqs;
blen = (int *) (displs + size);
weallocated = 0;
}
else { /* allocate the buffers ourself */
#endif
displs = (int *) malloc(size*sizeof(int));
if (displs == NULL) { line = __LINE__; err = -1; goto err_hndl; }
blen = (int *) malloc(size*sizeof(int));
if (blen == NULL) { line = __LINE__; err = -1; goto err_hndl; }
weallocated = 1;
#ifdef blahblah
}
#endif
/* Prepare for packing data */
err = MPI_Pack_size( scount*size, sdtype, comm, &maxpacksize );
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* pack buffer allocation */
packbuf = (char*) malloc((unsigned) maxpacksize);
if (packbuf == NULL) { line = __LINE__; err = -1; goto err_hndl; }
/* tmp buffer allocation for message data */
tmpbuf = (char *) malloc(scount*size*sext);
if (tmpbuf == NULL) { line = __LINE__; err = -1; goto err_hndl; }
/* Step 1 - local rotation - shift up by rank */
err = ompi_ddt_copy_content_same_ddt (sdtype, (int32_t) ((size-rank)*scount),
tmpbuf, ((char*)sbuf)+rank*scount*sext);
if (err<0) {
line = __LINE__; err = -1; goto err_hndl;
}
if (rank != 0) {
err = ompi_ddt_copy_content_same_ddt (sdtype, (int32_t) (rank*scount),
tmpbuf+(size-rank)*scount*sext, (char*)sbuf);
if (err<0) {
line = __LINE__; err = -1; goto err_hndl;
}
}
/* perform communication step */
for (distance = 1; distance < size; distance<<=1) {
/* send data to "sendto" */
sendto = (rank+distance)%size;
recvfrom = (rank-distance+size)%size;
packsize = 0;
k = 0;
/* create indexed datatype */
for (i = 1; i < size; i++) {
if ((i&distance) == distance) {
displs[k] = i*scount; blen[k] = scount;
k++;
}
}
/* Set indexes and displacements */
err = MPI_Type_indexed(k, blen, displs, sdtype, &iddt);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* Commit the new datatype */
err = MPI_Type_commit(&iddt);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* have the new distribution ddt, pack and exchange data */
err = MPI_Pack(tmpbuf, 1, iddt, packbuf, maxpacksize, &packsize, comm);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* Sendreceive */
err = ompi_coll_tuned_sendrecv ( packbuf, packsize, MPI_PACKED, sendto,
MCA_COLL_BASE_TAG_ALLTOALL,
rbuf, packsize, MPI_PACKED, recvfrom,
MCA_COLL_BASE_TAG_ALLTOALL,
comm, MPI_STATUS_IGNORE, rank);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* Unpack data from rbuf to tmpbuf */
position = 0;
err = MPI_Unpack(rbuf, packsize, &position,
tmpbuf, 1, iddt, comm);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* free ddt */
err = MPI_Type_free(&iddt);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
} /* end of for (distance = 1... */
/* Step 3 - local rotation - */
for (i = 0; i < size; i++) {
err = ompi_ddt_copy_content_same_ddt (rdtype, (int32_t) rcount,
((char*)rbuf)+(((rank-i+size)%size)*rcount*rext),
tmpbuf+i*rcount*rext);
if (err<0) {
line = __LINE__; err = -1; goto err_hndl;
}
}
/* Step 4 - clean up */
if (tmpbuf != NULL) free(tmpbuf);
if (packbuf != NULL) free(packbuf);
if (weallocated) {
if (displs != NULL) free(displs);
if (blen != NULL) free(blen);
}
return OMPI_SUCCESS;
err_hndl:
OPAL_OUTPUT((ompi_coll_tuned_stream,"%s:%4d\tError occurred %d, rank %2d", __FILE__,line,err,rank));
if (tmpbuf != NULL) free(tmpbuf);
if (packbuf != NULL) free(packbuf);
if (weallocated) {
if (displs != NULL) free(displs);
if (blen != NULL) free(blen);
}
return err;
}
/*
* alltoall_intra_linear_sync
*
* Function: Linear implementation of alltoall with limited number
* of outstanding requests.
* Accepts: Same as MPI_Alltoall(), and the maximum number of
* outstanding requests (actual number is 2 * max, since
* we count receive and send requests separately).
* Returns: MPI_SUCCESS or error code
*
* Description: Algorithm is the following:
* 1) post K irecvs, K <= N
* 2) post K isends, K <= N
* 3) while not done
* - wait for any request to complete
* - replace that request by the new one of the same type.
*/
int ompi_coll_tuned_alltoall_intra_linear_sync(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void* rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm,
int max_outstanding_reqs)
{
int line, error;
int ri, si;
int rank;
int size;
int nreqs, nrreqs, nsreqs, total_reqs;
char *psnd;
char *prcv;
ptrdiff_t slb, sext;
ptrdiff_t rlb, rext;
ompi_request_t **reqs = NULL;
/* Initialize. */
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,"ompi_coll_tuned_alltoall_intra_linear_sync rank %d", rank));
error = ompi_ddt_get_extent(sdtype, &slb, &sext);
if (OMPI_SUCCESS != error) {
return error;
}
sext *= scount;
error = ompi_ddt_get_extent(rdtype, &rlb, &rext);
if (OMPI_SUCCESS != error) {
return error;
}
rext *= rcount;
/* simple optimization */
psnd = ((char *) sbuf) + (rank * sext);
prcv = ((char *) rbuf) + (rank * rext);
error = ompi_ddt_sndrcv(psnd, scount, sdtype, prcv, rcount, rdtype);
if (MPI_SUCCESS != error) {
return error;
}
/* If only one process, we're done. */
if (1 == size) {
return MPI_SUCCESS;
}
/* Initiate send/recv to/from others. */
total_reqs = (((max_outstanding_reqs > (size - 1)) ||
(max_outstanding_reqs <= 0)) ?
(size - 1) : (max_outstanding_reqs));
reqs = (ompi_request_t**) malloc( 2 * total_reqs *
sizeof(ompi_request_t*));
if (NULL == reqs) { error = -1; goto error_hndl; }
prcv = (char *) rbuf;
psnd = (char *) sbuf;
/* Post first batch or ireceive and isend requests */
for (nreqs = 0, nrreqs = 0, ri = (rank + 1) % size; nreqs < total_reqs;
ri = (ri + 1) % size, ++nreqs, ++nrreqs) {
error =
MCA_PML_CALL(irecv
(prcv + (ri * rext), rcount, rdtype, ri,
MCA_COLL_BASE_TAG_ALLTOALL, comm, &reqs[nreqs]));
if (MPI_SUCCESS != error) { line = __LINE__; goto error_hndl; }
}
for ( nsreqs = 0, si = (rank + size - 1) % size; nreqs < 2 * total_reqs;
si = (si + size - 1) % size, ++nreqs, ++nsreqs) {
error =
MCA_PML_CALL(isend
(psnd + (si * sext), scount, sdtype, si,
MCA_COLL_BASE_TAG_ALLTOALL,
MCA_PML_BASE_SEND_STANDARD, comm, &reqs[nreqs]));
if (MPI_SUCCESS != error) { line = __LINE__; goto error_hndl; }
}
/* Wait for requests to complete */
if (nreqs == 2 * (size - 1)) {
/* Optimization for the case when all requests have been posted */
error = ompi_request_wait_all(nreqs, reqs, MPI_STATUSES_IGNORE);
if (MPI_SUCCESS != error) { line = __LINE__; goto error_hndl; }
} else {
/* As requests complete, replace them with corresponding requests:
- wait for any request to complete, mark the request as
MPI_REQUEST_NULL
- If it was a receive request, replace it with new irecv request
(if any)
- if it was a send request, replace it with new isend request (if any)
*/
int ncreqs = 0;
while (ncreqs < 2 * (size - 1)) {
int completed;
error = ompi_request_wait_any(2 * total_reqs, reqs, &completed,
MPI_STATUS_IGNORE);
if (MPI_SUCCESS != error) { line = __LINE__; goto error_hndl; }
reqs[completed] = MPI_REQUEST_NULL;
ncreqs++;
if (completed < total_reqs) {
if (nrreqs < (size - 1)) {
error =
MCA_PML_CALL(irecv
(prcv + (ri * rext), rcount, rdtype, ri,
MCA_COLL_BASE_TAG_ALLTOALL, comm,
&reqs[completed]));
if (MPI_SUCCESS != error) { line = __LINE__; goto error_hndl; }
++nrreqs;
ri = (ri + 1) % size;
}
} else {
if (nsreqs < (size - 1)) {
error = MCA_PML_CALL(isend
(psnd + (si * sext), scount, sdtype, si,
MCA_COLL_BASE_TAG_ALLTOALL,
MCA_PML_BASE_SEND_STANDARD, comm,
&reqs[completed]));
++nsreqs;
si = (si + size - 1) % size;
}
}
}
}
/* Free the reqs */
free(reqs);
/* All done */
return MPI_SUCCESS;
error_hndl:
OPAL_OUTPUT((ompi_coll_tuned_stream,"%s:%4d\tError occurred %d, rank %2d", __FILE__, line, error, rank));
if (NULL != reqs) free(reqs);
return error;
}
int ompi_coll_tuned_alltoall_intra_two_procs(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void* rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm)
{
int line = -1, err = 0;
int rank;
int sendto, recvfrom;
void * tmpsend, *tmprecv;
ptrdiff_t sext, rext, lb;
rank = ompi_comm_rank(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,"ompi_coll_tuned_alltoall_intra_two_procs rank %d", rank));
err = ompi_ddt_get_extent (sdtype, &lb, &sext);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
err = ompi_ddt_get_extent (rdtype, &lb, &rext);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* exchange data */
sendto = (rank+1)%2;
recvfrom = sendto;
/* where from are we sending and where to are we receiving ? */
tmpsend = (char*)sbuf+sendto*sext*scount;
tmprecv = (char*)rbuf+recvfrom*rext*rcount;
/* send and receive */
err = ompi_coll_tuned_sendrecv ( tmpsend, scount, sdtype, sendto, MCA_COLL_BASE_TAG_ALLTOALL,
tmprecv, rcount, rdtype, recvfrom, MCA_COLL_BASE_TAG_ALLTOALL,
comm, MPI_STATUS_IGNORE, rank );
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* ddt sendrecv your own data */
err = ompi_ddt_sndrcv((char*) sbuf+rank*sext*scount, (int32_t) scount, sdtype,
(char*) rbuf+rank*rext*rcount, (int32_t) rcount, rdtype);
if (err != MPI_SUCCESS) { line = __LINE__; goto err_hndl; }
/* done */
return MPI_SUCCESS;
err_hndl:
OPAL_OUTPUT((ompi_coll_tuned_stream,"%s:%4d\tError occurred %d, rank %2d", __FILE__,line,err,rank));
return err;
}
/*
* Linear functions are copied from the BASIC coll module
* they do not segment the message and are simple implementations
* but for some small number of nodes and/or small data sizes they
* are just as fast as tuned/tree based segmenting operations
* and as such may be selected by the decision functions
* These are copied into this module due to the way we select modules
* in V1. i.e. in V2 we will handle this differently and so will not
* have to duplicate code.
* GEF Oct05 after asking Jeff.
*/
/* copied function (with appropriate renaming) starts here */
int ompi_coll_tuned_alltoall_intra_basic_linear(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void* rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm)
{
int i;
int rank;
int size;
int err;
int nreqs;
char *psnd;
char *prcv;
MPI_Aint lb;
MPI_Aint sndinc;
MPI_Aint rcvinc;
ompi_request_t **req;
ompi_request_t **sreq;
ompi_request_t **rreq;
/* Initialize. */
size = ompi_comm_size(comm);
rank = ompi_comm_rank(comm);
OPAL_OUTPUT((ompi_coll_tuned_stream,"ompi_coll_tuned_alltoall_intra_basic_linear rank %d", rank));
err = ompi_ddt_get_extent(sdtype, &lb, &sndinc);
if (OMPI_SUCCESS != err) {
return err;
}
sndinc *= scount;
err = ompi_ddt_get_extent(rdtype, &lb, &rcvinc);
if (OMPI_SUCCESS != err) {
return err;
}
rcvinc *= rcount;
/* simple optimization */
psnd = ((char *) sbuf) + (rank * sndinc);
prcv = ((char *) rbuf) + (rank * rcvinc);
err = ompi_ddt_sndrcv(psnd, scount, sdtype, prcv, rcount, rdtype);
if (MPI_SUCCESS != err) {
return err;
}
/* If only one process, we're done. */
if (1 == size) {
return MPI_SUCCESS;
}
/* Initiate all send/recv to/from others. */
req = rreq = comm->c_coll_basic_data->mcct_reqs;
sreq = rreq + size - 1;
prcv = (char *) rbuf;
psnd = (char *) sbuf;
/* Post all receives first -- a simple optimization */
for (nreqs = 0, i = (rank + 1) % size; i != rank;
i = (i + 1) % size, ++rreq, ++nreqs) {
err =
MCA_PML_CALL(irecv_init
(prcv + (i * rcvinc), rcount, rdtype, i,
MCA_COLL_BASE_TAG_ALLTOALL, comm, rreq));
if (MPI_SUCCESS != err) {
ompi_coll_tuned_free_reqs(req, rreq - req);
return err;
}
}
/* Now post all sends in reverse order
- We would like to minimize the search time through message queue
when messages actually arrive in the order in which they were posted.
*/
for (nreqs = 0, i = (rank + size - 1) % size; i != rank;
i = (i + size - 1) % size, ++sreq, ++nreqs) {
err =
MCA_PML_CALL(isend_init
(psnd + (i * sndinc), scount, sdtype, i,
MCA_COLL_BASE_TAG_ALLTOALL,
MCA_PML_BASE_SEND_STANDARD, comm, sreq));
if (MPI_SUCCESS != err) {
ompi_coll_tuned_free_reqs(req, sreq - req);
return err;
}
}
nreqs = (size - 1) * 2;
/* Start your engines. This will never return an error. */
MCA_PML_CALL(start(nreqs, req));
/* Wait for them all. If there's an error, note that we don't
* care what the error was -- just that there *was* an error. The
* PML will finish all requests, even if one or more of them fail.
* i.e., by the end of this call, all the requests are free-able.
* So free them anyway -- even if there was an error, and return
* the error after we free everything. */
err = ompi_request_wait_all(nreqs, req, MPI_STATUSES_IGNORE);
/* Free the reqs */
ompi_coll_tuned_free_reqs(req, nreqs);
/* All done */
return err;
}
/* copied function (with appropriate renaming) ends here */
/* 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_alltoall_intra_check_forced_init (coll_tuned_force_algorithm_mca_param_indices_t *mca_param_indices)
{
int rc, max_alg = 5, requested_alg, max_requests;
ompi_coll_tuned_forced_max_algorithms[ALLTOALL] = max_alg;
rc = mca_base_param_reg_int (&mca_coll_tuned_component.super.collm_version,
"alltoall_algorithm_count",
"Number of alltoall 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,
"alltoall_algorithm",
"Which alltoall algorithm is used. Can be locked down to choice of: 0 ignore, 1 basic linear, 2 pairwise, 3: modified bruck, 4: linear with sync, 5:two proc only.",
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, "Alltoall 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,
"alltoall_algorithm_segmentsize",
"Segment size in bytes used by default for alltoall 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,
"alltoall_algorithm_tree_fanout",
"Fanout for n-tree used for alltoall 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,
"alltoall_algorithm_chain_fanout",
"Fanout for chains used for alltoall 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);
mca_param_indices->max_requests_param_index
= mca_base_param_reg_int(&mca_coll_tuned_component.super.collm_version,
"alltoall_algorithm_max_requests",
"Maximum number of outstanding send or recv requests. Only has meaning for synchronized algorithms.",
false, false,
ompi_coll_tuned_init_max_requests, /* get system wide default */
NULL);
mca_base_param_lookup_int(mca_param_indices->max_requests_param_index, &(max_requests));
if( max_requests <= 1 ) {
if( 0 == ompi_comm_rank( MPI_COMM_WORLD ) ) {
opal_output( 0, "Maximum outstanding requests must be positive number greater than 1. Switching to system level default %d \n",
ompi_coll_tuned_init_max_requests );
}
mca_base_param_set_int( mca_param_indices->max_requests_param_index,
ompi_coll_tuned_init_max_requests);
}
return (MPI_SUCCESS);
}
int ompi_coll_tuned_alltoall_intra_do_forced(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void* rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm)
{
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:alltoall_intra_do_forced selected algorithm %d",
comm->c_coll_selected_data->user_forced[ALLTOALL].algorithm));
switch (comm->c_coll_selected_data->user_forced[ALLTOALL].algorithm) {
case (0): return ompi_coll_tuned_alltoall_intra_dec_fixed (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (1): return ompi_coll_tuned_alltoall_intra_basic_linear (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (2): return ompi_coll_tuned_alltoall_intra_pairwise (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (3): return ompi_coll_tuned_alltoall_intra_bruck (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (4): return ompi_coll_tuned_alltoall_intra_linear_sync (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm, comm->c_coll_selected_data->user_forced[ALLTOALL].max_requests);
case (5): return ompi_coll_tuned_alltoall_intra_two_procs (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
default:
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:alltoall_intra_do_forced attempt to select algorithm %d when only 0-%d is valid?",
comm->c_coll_selected_data->user_forced[ALLTOALL].algorithm, ompi_coll_tuned_forced_max_algorithms[ALLTOALL]));
return (MPI_ERR_ARG);
} /* switch */
}
int ompi_coll_tuned_alltoall_intra_do_this(void *sbuf, int scount,
struct ompi_datatype_t *sdtype,
void* rbuf, int rcount,
struct ompi_datatype_t *rdtype,
struct ompi_communicator_t *comm,
int algorithm, int faninout, int segsize,
int max_requests)
{
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:alltoall_intra_do_this selected algorithm %d topo faninout %d segsize %d",
algorithm, faninout, segsize));
switch (algorithm) {
case (0): return ompi_coll_tuned_alltoall_intra_dec_fixed (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (1): return ompi_coll_tuned_alltoall_intra_basic_linear (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (2): return ompi_coll_tuned_alltoall_intra_pairwise (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (3): return ompi_coll_tuned_alltoall_intra_bruck (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
case (4): return ompi_coll_tuned_alltoall_intra_linear_sync (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm, max_requests);
case (5): return ompi_coll_tuned_alltoall_intra_two_procs (sbuf, scount, sdtype, rbuf, rcount, rdtype, comm);
default:
OPAL_OUTPUT((ompi_coll_tuned_stream,"coll:tuned:alltoall_intra_do_this attempt to select algorithm %d when only 0-%d is valid?",
algorithm, ompi_coll_tuned_forced_max_algorithms[ALLTOALL]));
return (MPI_ERR_ARG);
} /* switch */
}
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