528 строки
21 KiB
C
528 строки
21 KiB
C
/*
|
|
* Copyright (c) 2006 The Trustees of Indiana University and Indiana
|
|
* University Research and Technology
|
|
* Corporation. All rights reserved.
|
|
* Copyright (c) 2006 The Technical University of Chemnitz. All
|
|
* rights reserved.
|
|
* Copyright (c) 2013 Los Alamos National Security, LLC. All rights
|
|
* reserved.
|
|
* Copyright (c) 2014 Research Organization for Information Science
|
|
* and Technology (RIST). All rights reserved.
|
|
*
|
|
* Author(s): Torsten Hoefler <htor@cs.indiana.edu>
|
|
*
|
|
*/
|
|
#include "nbc_internal.h"
|
|
#include "ompi/communicator/communicator.h"
|
|
#include "ompi/datatype/ompi_datatype.h"
|
|
|
|
#include <assert.h>
|
|
|
|
static inline int allred_sched_diss(int rank, int p, int count, MPI_Datatype datatype, void *sendbuf, void *recvbuf, MPI_Op op, NBC_Schedule *schedule, NBC_Handle *handle);
|
|
static inline int allred_sched_ring(int rank, int p, int count, MPI_Datatype datatype, void *sendbuf, void *recvbuf, MPI_Op op, int size, int ext, NBC_Schedule *schedule, NBC_Handle *handle);
|
|
static inline int allred_sched_linear(int rank, int p, void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int ext, int size, NBC_Schedule *schedule, NBC_Handle *handle);
|
|
|
|
#ifdef NBC_CACHE_SCHEDULE
|
|
/* tree comparison function for schedule cache */
|
|
int NBC_Allreduce_args_compare(NBC_Allreduce_args *a, NBC_Allreduce_args *b, void *param) {
|
|
|
|
if( (a->sendbuf == b->sendbuf) &&
|
|
(a->recvbuf == b->recvbuf) &&
|
|
(a->count == b->count) &&
|
|
(a->datatype == b->datatype) &&
|
|
(a->op == b->op) ) {
|
|
return 0;
|
|
}
|
|
if( a->sendbuf < b->sendbuf ) {
|
|
return -1;
|
|
}
|
|
return +1;
|
|
}
|
|
#endif
|
|
|
|
int ompi_coll_libnbc_iallreduce(void* sendbuf, void* recvbuf, int count, MPI_Datatype datatype, MPI_Op op,
|
|
struct ompi_communicator_t *comm, ompi_request_t ** request,
|
|
struct mca_coll_base_module_2_1_0_t *module)
|
|
{
|
|
int rank, p, res;
|
|
OPAL_PTRDIFF_TYPE ext, lb;
|
|
NBC_Schedule *schedule;
|
|
size_t size;
|
|
#ifdef NBC_CACHE_SCHEDULE
|
|
NBC_Allreduce_args *args, *found, search;
|
|
#endif
|
|
enum { NBC_ARED_BINOMIAL, NBC_ARED_RING } alg;
|
|
char inplace;
|
|
NBC_Handle *handle;
|
|
ompi_coll_libnbc_request_t **coll_req = (ompi_coll_libnbc_request_t**) request;
|
|
ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;
|
|
|
|
NBC_IN_PLACE(sendbuf, recvbuf, inplace);
|
|
|
|
res = NBC_Init_handle(comm, coll_req, libnbc_module);
|
|
if(res != NBC_OK) { printf("Error in NBC_Init_handle(%i)\n", res); return res; }
|
|
handle = (*coll_req);
|
|
|
|
rank = ompi_comm_rank (comm);
|
|
p = ompi_comm_size (comm);
|
|
res = ompi_datatype_get_extent(datatype, &lb, &ext);
|
|
if (OMPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
|
|
res = ompi_datatype_type_size (datatype, &size);
|
|
if (OMPI_SUCCESS != res) { printf("MPI Error in MPI_Type_size() (%i)\n", res); return res; }
|
|
|
|
handle->tmpbuf = malloc(ext*count);
|
|
if(handle->tmpbuf == NULL) { printf("Error in malloc() (%i)\n", res); return NBC_OOR; }
|
|
|
|
if((p == 1) && !inplace) {
|
|
/* for a single node - copy data to receivebuf */
|
|
res = NBC_Copy(sendbuf, count, datatype, recvbuf, count, datatype, comm);
|
|
if (NBC_OK != res) { printf("Error in NBC_Copy() (%i)\n", res); return res; }
|
|
}
|
|
|
|
/* algorithm selection */
|
|
if(p < 4 || size*count < 65536 || inplace) {
|
|
alg = NBC_ARED_BINOMIAL;
|
|
} else {
|
|
alg = NBC_ARED_RING;
|
|
}
|
|
|
|
#ifdef NBC_CACHE_SCHEDULE
|
|
/* search schedule in communicator specific tree */
|
|
search.sendbuf=sendbuf;
|
|
search.recvbuf=recvbuf;
|
|
search.count=count;
|
|
search.datatype=datatype;
|
|
search.op=op;
|
|
found = (NBC_Allreduce_args*)hb_tree_search((hb_tree*)handle->comminfo->NBC_Dict[NBC_ALLREDUCE], &search);
|
|
if(found == NULL) {
|
|
#endif
|
|
schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
|
|
if (NULL == schedule) { printf("Error in malloc()\n"); return res; }
|
|
|
|
res = NBC_Sched_create(schedule);
|
|
if(res != NBC_OK) { printf("Error in NBC_Sched_create (%i)\n", res); return res; }
|
|
|
|
switch(alg) {
|
|
case NBC_ARED_BINOMIAL:
|
|
res = allred_sched_diss(rank, p, count, datatype, sendbuf, recvbuf, op, schedule, handle);
|
|
break;
|
|
case NBC_ARED_RING:
|
|
res = allred_sched_ring(rank, p, count, datatype, sendbuf, recvbuf, op, size, ext, schedule, handle);
|
|
break;
|
|
}
|
|
if (NBC_OK != res) { printf("Error in Schedule creation() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Sched_commit(schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_commit() (%i)\n", res); return res; }
|
|
|
|
#ifdef NBC_CACHE_SCHEDULE
|
|
/* save schedule to tree */
|
|
args = (NBC_Allreduce_args*)malloc(sizeof(NBC_Allreduce_args));
|
|
args->sendbuf=sendbuf;
|
|
args->recvbuf=recvbuf;
|
|
args->count=count;
|
|
args->datatype=datatype;
|
|
args->op=op;
|
|
args->schedule=schedule;
|
|
res = hb_tree_insert ((hb_tree*)handle->comminfo->NBC_Dict[NBC_ALLREDUCE], args, args, 0);
|
|
if(res != 0) printf("error in dict_insert() (%i)\n", res);
|
|
/* increase number of elements for A2A */
|
|
if(++handle->comminfo->NBC_Dict_size[NBC_ALLREDUCE] > NBC_SCHED_DICT_UPPER) {
|
|
NBC_SchedCache_dictwipe((hb_tree*)handle->comminfo->NBC_Dict[NBC_ALLREDUCE], &handle->comminfo->NBC_Dict_size[NBC_ALLREDUCE]);
|
|
}
|
|
} else {
|
|
/* found schedule */
|
|
schedule=found->schedule;
|
|
}
|
|
#endif
|
|
|
|
res = NBC_Start(handle, schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Start() (%i)\n", res); return res; }
|
|
|
|
/* tmpbuf is freed with the handle */
|
|
return NBC_OK;
|
|
}
|
|
|
|
int ompi_coll_libnbc_iallreduce_inter(void* sendbuf, void* recvbuf, int count, MPI_Datatype datatype, MPI_Op op,
|
|
struct ompi_communicator_t *comm, ompi_request_t ** request,
|
|
struct mca_coll_base_module_2_1_0_t *module)
|
|
{
|
|
int rank, res, size, rsize;
|
|
MPI_Aint ext;
|
|
NBC_Schedule *schedule;
|
|
NBC_Handle *handle;
|
|
ompi_coll_libnbc_request_t **coll_req = (ompi_coll_libnbc_request_t**) request;
|
|
ompi_coll_libnbc_module_t *libnbc_module = (ompi_coll_libnbc_module_t*) module;
|
|
|
|
res = NBC_Init_handle(comm, coll_req, libnbc_module);
|
|
if(res != NBC_OK) { printf("Error in NBC_Init_handle(%i)\n", res); return res; }
|
|
handle = (*coll_req);
|
|
res = MPI_Comm_rank(comm, &rank);
|
|
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_rank() (%i)\n", res); return res; }
|
|
res = MPI_Comm_remote_size(comm, &rsize);
|
|
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Comm_remote_size() (%i)\n", res); return res; }
|
|
res = MPI_Type_extent(datatype, &ext);
|
|
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_extent() (%i)\n", res); return res; }
|
|
res = MPI_Type_size(datatype, &size);
|
|
if (MPI_SUCCESS != res) { printf("MPI Error in MPI_Type_size() (%i)\n", res); return res; }
|
|
|
|
handle->tmpbuf = malloc(ext*count);
|
|
if(handle->tmpbuf == NULL) { printf("Error in malloc() (%i)\n", res); return NBC_OOR; }
|
|
|
|
schedule = (NBC_Schedule*)malloc(sizeof(NBC_Schedule));
|
|
if (NULL == schedule) { printf("Error in malloc()\n"); return res; }
|
|
|
|
res = NBC_Sched_create(schedule);
|
|
if(res != NBC_OK) { printf("Error in NBC_Sched_create (%i)\n", res); return res; }
|
|
|
|
res = allred_sched_linear(rank, rsize, sendbuf, recvbuf, count, datatype, op, ext, size, schedule, handle);
|
|
if (NBC_OK != res) { printf("Error in Schedule creation() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Sched_commit(schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_commit() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Start(handle, schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Start() (%i)\n", res); return res; }
|
|
|
|
/* tmpbuf is freed with the handle */
|
|
return NBC_OK;
|
|
}
|
|
|
|
|
|
/* binomial allreduce (binomial tree up and binomial bcast down)
|
|
* working principle:
|
|
* - each node gets a virtual rank vrank
|
|
* - the 'root' node get vrank 0
|
|
* - node 0 gets the vrank of the 'root'
|
|
* - all other ranks stay identical (they do not matter)
|
|
*
|
|
* Algorithm:
|
|
* pairwise exchange
|
|
* round r:
|
|
* grp = rank % 2^r
|
|
* if grp == 0: receive from rank + 2^(r-1) if it exists and reduce value
|
|
* if grp == 1: send to rank - 2^(r-1) and exit function
|
|
*
|
|
* do this for R=log_2(p) rounds
|
|
* followed by a Bcast:
|
|
* Algorithm:
|
|
* - each node with vrank > 2^r and vrank < 2^r+1 receives from node
|
|
* vrank - 2^r (vrank=1 receives from 0, vrank 0 receives never)
|
|
* - each node sends each round r to node vrank + 2^r
|
|
* - a node stops to send if 2^r > commsize
|
|
*
|
|
*/
|
|
#define RANK2VRANK(rank, vrank, root) \
|
|
{ \
|
|
vrank = rank; \
|
|
if (rank == 0) vrank = root; \
|
|
if (rank == root) vrank = 0; \
|
|
}
|
|
#define VRANK2RANK(rank, vrank, root) \
|
|
{ \
|
|
rank = vrank; \
|
|
if (vrank == 0) rank = root; \
|
|
if (vrank == root) rank = 0; \
|
|
}
|
|
static inline int allred_sched_diss(int rank, int p, int count, MPI_Datatype datatype, void *sendbuf, void *recvbuf, MPI_Op op, NBC_Schedule *schedule, NBC_Handle *handle) {
|
|
int root, vrank, r, maxr, firstred, vpeer, peer, res;
|
|
|
|
root = 0; /* this makes the code for ireduce and iallreduce nearly identical - could be changed to improve performance */
|
|
RANK2VRANK(rank, vrank, root);
|
|
maxr = (int)ceil((log((double)p)/LOG2));
|
|
|
|
firstred = 1;
|
|
for(r=1; r<=maxr; r++) {
|
|
if((vrank % (1<<r)) == 0) {
|
|
/* we have to receive this round */
|
|
vpeer = vrank + (1<<(r-1));
|
|
VRANK2RANK(peer, vpeer, root)
|
|
if(peer<p) {
|
|
res = NBC_Sched_recv(0, true, count, datatype, peer, schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
|
|
/* we have to wait until we have the data */
|
|
res = NBC_Sched_barrier(schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_barrier() (%i)\n", res); return res; }
|
|
if(firstred && MPI_IN_PLACE != sendbuf) {
|
|
/* perform the reduce with the senbuf */
|
|
res = NBC_Sched_op(recvbuf, false, sendbuf, false, 0, true, count, datatype, op, schedule);
|
|
firstred = 0;
|
|
} else {
|
|
/* perform the reduce in my local buffer */
|
|
res = NBC_Sched_op(recvbuf, false, recvbuf, false, 0, true, count, datatype, op, schedule);
|
|
}
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_op() (%i)\n", res); return res; }
|
|
/* this cannot be done until handle->tmpbuf is unused :-( */
|
|
res = NBC_Sched_barrier(schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_barrier() (%i)\n", res); return res; }
|
|
}
|
|
} else {
|
|
/* we have to send this round */
|
|
vpeer = vrank - (1<<(r-1));
|
|
VRANK2RANK(peer, vpeer, root)
|
|
if(firstred && MPI_IN_PLACE != sendbuf) {
|
|
/* we have to use the sendbuf in the first round .. */
|
|
res = NBC_Sched_send(sendbuf, false, count, datatype, peer, schedule);
|
|
} else {
|
|
/* and the recvbuf in all remeining rounds */
|
|
res = NBC_Sched_send(recvbuf, false, count, datatype, peer, schedule);
|
|
}
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
|
|
/* leave the game */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* this is the Bcast part - copied with minor changes from nbc_ibcast.c
|
|
* changed: buffer -> recvbuf */
|
|
RANK2VRANK(rank, vrank, root);
|
|
|
|
/* receive from the right hosts */
|
|
if(vrank != 0) {
|
|
for(r=0; r<maxr; r++) {
|
|
if((vrank >= (1<<r)) && (vrank < (1<<(r+1)))) {
|
|
VRANK2RANK(peer, vrank-(1<<r), root);
|
|
res = NBC_Sched_recv(recvbuf, false, count, datatype, peer, schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
|
|
}
|
|
}
|
|
res = NBC_Sched_barrier(schedule);
|
|
if(NBC_OK != res) { free(handle->tmpbuf); printf("Error in NBC_Sched_barrier() (%i)\n", res); return res; }
|
|
}
|
|
|
|
/* now send to the right hosts */
|
|
for(r=0; r<maxr; r++) {
|
|
if(((vrank + (1<<r) < p) && (vrank < (1<<r))) || (vrank == 0)) {
|
|
VRANK2RANK(peer, vrank+(1<<r), root);
|
|
res = NBC_Sched_send(recvbuf, false, count, datatype, peer, schedule);
|
|
if(res != NBC_OK) { free(handle->tmpbuf); printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
|
|
}
|
|
}
|
|
/* end of the bcast */
|
|
|
|
return NBC_OK;
|
|
}
|
|
|
|
static inline int allred_sched_ring(int r, int p, int count, MPI_Datatype datatype, void *sendbuf, void *recvbuf, MPI_Op op, int size, int ext, NBC_Schedule *schedule, NBC_Handle *handle) {
|
|
int i; /* runner */
|
|
int segsize, *segsizes, *segoffsets; /* segment sizes and offsets per segment (number of segments == number of nodes */
|
|
int speer, rpeer; /* send and recvpeer */
|
|
|
|
if(count == 0) return NBC_OK;
|
|
|
|
{
|
|
int mycount; /* temporary */
|
|
segsizes = (int*)malloc(sizeof(int)*p);
|
|
segoffsets = (int*)malloc(sizeof(int)*p);
|
|
segsize = count/p; /* size of the segments */
|
|
if(count%p != 0) segsize++;
|
|
mycount = count;
|
|
segoffsets[0] = 0;
|
|
for(i = 0; i<p;i++) {
|
|
mycount -= segsize;
|
|
segsizes[i] = segsize;
|
|
if(mycount < 0) {
|
|
segsizes[i] = segsize+mycount;
|
|
mycount = 0;
|
|
}
|
|
if(i) segoffsets[i] = segoffsets[i-1] + segsizes[i-1];
|
|
/*if(!r) printf("count: %i, (%i) size: %i, offset: %i\n", count, i, segsizes[i], segoffsets[i]); */
|
|
}
|
|
}
|
|
|
|
/* reduce peers */
|
|
speer = (r+1)%p;
|
|
rpeer = (r-1+p)%p;
|
|
|
|
/* + -> reduced this round
|
|
* / -> sum (reduced in a previous step)
|
|
*
|
|
* *** round 0 ***
|
|
* 0 1 2
|
|
*
|
|
* 00 10 20 0: [1] -> 1
|
|
* 01 11 21 1: [2] -> 2
|
|
* 02 12 22 2: [0] -> 0 --> send element (r+1)%p to node (r+1)%p
|
|
*
|
|
* *** round 1 ***
|
|
* 0 1 2
|
|
*
|
|
* 00+20 10 20 0: red(0), [0] -> 1
|
|
* 01 11+01 21 1: red(1), [1] -> 2
|
|
* 02 12 22+12 2: red(2), [2] -> 0 --> reduce and send element (r+0)%p to node (r+1)%p
|
|
*
|
|
* *** round 2 ***
|
|
* 0 1 2
|
|
*
|
|
* 00/20 all 20 0: red(2), [2] -> 1
|
|
* 01 11/01 all 1: red(0), [0] -> 2
|
|
* all 12 22/12 2: red(1), [1] -> 0 --> reduce and send (r-1)%p to node (r+1)%p
|
|
*
|
|
* *** round 3 ***
|
|
* 0 1 2
|
|
*
|
|
* 00/20 all all 0: [1] -> 1
|
|
* all 11/01 all 1: [2] -> 2
|
|
* all all 22/12 2: [0] -> 0 --> send element (r-2)%p to node (r+1)%p
|
|
*
|
|
* *** round 4 ***
|
|
* 0 1 2
|
|
*
|
|
* all all all 0: done
|
|
* all all all 1: done
|
|
* all all all 2: done
|
|
*
|
|
* -> 4
|
|
* *** round 0 ***
|
|
* 0 1 2 3
|
|
*
|
|
* 00 10 20 30 0: [1] -> 1
|
|
* 01 11 21 31 1: [2] -> 2
|
|
* 02 12 22 32 2: [3] -> 3
|
|
* 03 13 23 33 3: [0] -> 0 --> send element (r+1)%p to node (r+1)%p
|
|
*
|
|
* *** round 1 ***
|
|
* 0 1 2 3
|
|
*
|
|
* 00+30 10 20 30 0: red(0), [0] -> 1
|
|
* 01 11+01 21 31 1: red(1), [1] -> 2
|
|
* 02 12 22+12 32 2: red(2), [2] -> 3
|
|
* 03 13 23 33+23 3: red(3), [3] -> 0 --> reduce and send element (r+0)%p to node (r+1)%p
|
|
*
|
|
* *** round 2 ***
|
|
* 0 1 2 3
|
|
*
|
|
* 00/30 10+00/30 20 30 0: red(3), [3] -> 1
|
|
* 01 11/01 21+11/01 31 1: red(0), [0] -> 2
|
|
* 02 12 22/12 32+22/12 2: red(1), [1] -> 3
|
|
* 03+33/23 13 23 33/23 3: red(2), [2] -> 0 --> reduce and send (r-1)%p to node (r+1)%p
|
|
*
|
|
* *** round 3 ***
|
|
* 0 1 2 3
|
|
*
|
|
* 00/30 10/00/30 all 30 0: red(2), [2] -> 1
|
|
* 01 11/01 21/11/01 all 1: red(3), [3] -> 2
|
|
* all 12 22/12 32/22/12 2: red(0), [0] -> 3
|
|
* 03/33/23 all 23 33/23 3: red(1), [1] -> 0 --> reduce and send (r-2)%p to node (r+1)%p
|
|
*
|
|
* *** round 4 ***
|
|
* 0 1 2 3
|
|
*
|
|
* 00/30 10/00/30 all all 0: [1] -> 1
|
|
* all 11/01 21/11/01 all 1: [2] -> 2
|
|
* all all 22/12 32/22/12 2: [3] -> 3
|
|
* 03/33/23 all all 33/23 3: [0] -> 0 --> receive and send element (r+1)%p to node (r+1)%p
|
|
*
|
|
* *** round 5 ***
|
|
* 0 1 2 3
|
|
*
|
|
* all 10/00/30 all all 0: [0] -> 1
|
|
* all all 21/11/01 all 1: [1] -> 2
|
|
* all all all 32/22/12 2: [3] -> 3
|
|
* 03/33/23 all all all 3: [4] -> 4 --> receive and send element (r-0)%p to node (r+1)%p
|
|
*
|
|
* *** round 6 ***
|
|
* 0 1 2 3
|
|
*
|
|
* all all all all
|
|
* all all all all
|
|
* all all all all
|
|
* all all all all receive element (r-1)%p
|
|
*
|
|
* 2p-2 rounds ... every node does p-1 reductions and p-1 sends
|
|
*
|
|
*/
|
|
{
|
|
int round = 0;
|
|
/* first p-1 rounds are reductions */
|
|
do {
|
|
int selement = (r+1-round + 2*p /*2*p avoids negative mod*/)%p; /* the element I am sending */
|
|
int soffset = segoffsets[selement]*ext;
|
|
int relement = (r-round + 2*p /*2*p avoids negative mod*/)%p; /* the element that I receive from my neighbor */
|
|
int roffset = segoffsets[relement]*ext;
|
|
|
|
/* first message come out of sendbuf */
|
|
if(round == 0) {
|
|
NBC_Sched_send((char*)sendbuf+soffset, false, segsizes[selement], datatype, speer, schedule);
|
|
} else {
|
|
NBC_Sched_send((char*)recvbuf+soffset, false, segsizes[selement], datatype, speer, schedule);
|
|
}
|
|
NBC_Sched_recv((char*)recvbuf+roffset, false, segsizes[relement], datatype, rpeer, schedule);
|
|
|
|
NBC_Sched_barrier(schedule);
|
|
NBC_Sched_op((char*)recvbuf+roffset, false, (char*)sendbuf+roffset, false, (char*)recvbuf+roffset, false, segsizes[relement], datatype, op, schedule);
|
|
NBC_Sched_barrier(schedule);
|
|
|
|
round++;
|
|
} while(round < p-1);
|
|
|
|
do {
|
|
int selement = (r+1-round + 2*p /*2*p avoids negative mod*/)%p; /* the element I am sending */
|
|
int soffset = segoffsets[selement]*ext;
|
|
int relement = (r-round + 2*p /*2*p avoids negative mod*/)%p; /* the element that I receive from my neighbor */
|
|
int roffset = segoffsets[relement]*ext;
|
|
|
|
NBC_Sched_send((char*)recvbuf+soffset, false, segsizes[selement], datatype, speer, schedule);
|
|
NBC_Sched_recv((char*)recvbuf+roffset, false, segsizes[relement], datatype, rpeer, schedule);
|
|
NBC_Sched_barrier(schedule);
|
|
round++;
|
|
} while (round < 2*p-2);
|
|
}
|
|
|
|
return NBC_OK;
|
|
}
|
|
|
|
static inline int allred_sched_linear(int rank, int rsize, void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
|
|
MPI_Op op, int ext, int size, NBC_Schedule *schedule, NBC_Handle *handle) {
|
|
int res, rpeer;
|
|
|
|
if(count == 0) return NBC_OK;
|
|
|
|
/* send my data to the remote root */
|
|
res = NBC_Sched_send (sendbuf, false, count, datatype, 0, schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Sched_recv (recvbuf, false, count, datatype, 0, schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
|
|
|
|
if (0 == rank) {
|
|
/* wait for data from the remote root */
|
|
res = NBC_Sched_barrier (schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_barrier() (%i)\n", res); return res; }
|
|
|
|
/* get data from remote peers and reduce */
|
|
for (rpeer = 1 ; rpeer < rsize ; ++rpeer) {
|
|
res = NBC_Sched_recv (0, true, count, datatype, rpeer, schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Sched_barrier(schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_barrier() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Sched_op (recvbuf, false, 0, true, recvbuf, false, count, datatype, op, schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_op() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Sched_barrier(schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_barrier() (%i)\n", res); return res; }
|
|
}
|
|
|
|
/* exchange our result with the remote root (each root will broadcast to the other's peers) */
|
|
res = NBC_Sched_recv (0, true, count, datatype, 0, schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_recv() (%i)\n", res); return res; }
|
|
|
|
res = NBC_Sched_send (recvbuf, false, count, datatype, 0, schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
|
|
|
|
/* wait for data from remote root */
|
|
res = NBC_Sched_barrier(schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_barrier() (%i)\n", res); return res; }
|
|
|
|
/* broadcast the result to all remote peers */
|
|
for (rpeer = 1 ; rpeer < rsize ; ++rpeer) {
|
|
res = NBC_Sched_send (0, true, count, datatype, rpeer, schedule);
|
|
if (NBC_OK != res) { printf("Error in NBC_Sched_send() (%i)\n", res); return res; }
|
|
}
|
|
}
|
|
|
|
return NBC_OK;
|
|
}
|