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2dstencil_pack_mp_strong_3streams.c
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/****
* Copyright (c) 2011-2014, NVIDIA Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the NVIDIA Corporation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
****/
#include <stdio.h>
#include <cuda.h>
#include <cuda_runtime.h>
#include <mpi.h>
#include "validate_strong.h"
#include <mp.h>
#include "pack_strong.h"
#include <string.h>
#include <time.h>
#ifdef USE_PROF
#include "prof.h"
#else
struct prof { };
#define PROF(P, H) do { } while(0)
static inline int prof_init(struct prof *p, int unit_scale, int scale_factor, const char* unit_scale_str, int nbins, int merge_bins, const char *tags) {return 0;}
static inline int prof_destroy(struct prof *p) {return 0;}
static inline void prof_dump(struct prof *p) {}
static inline void prof_update(struct prof *p) {}
static inline void prof_enable(struct prof *p) {}
static inline int prof_enabled(struct prof *p) { return 0; }
static inline void prof_disable(struct prof *p) {}
static inline void prof_reset(struct prof *p) {}
#endif
/* x
* ^
* -
* -
* -
* 0 --------> y
* */
#define CUDA_CHECK(stmt) \
do { \
cudaError_t result = (stmt); \
if (cudaSuccess != result) { \
fprintf(stderr, "[%s:%d] cuda failed with %s \n", \
__FILE__, __LINE__,cudaGetErrorString(result));\
exit(-1); \
} \
assert(cudaSuccess == result); \
} while (0)
struct prof prof;
struct prof prof_isend_prepare;
int prof_start = 0;
int prof_idx = 0;
long long int min_size = 8, max_size = 8*1024, default_boundary = 2;
int comm_size, px, py;
int comm_rank, rank_coords[2], rank_base[2];
int left, right, bottom, top, peers[4];
int peer_count, req_per_step;
int sreq_max_inflight, rreq_max_inflight, steps_per_batch = 4, batches_inflight = 4, buffering = 2, prepost_depth = 4;
int threadsperblock = 512, gridsize = 15;
int max_comm_size = 65536;
static inline int intlog2(int x) {
int result = 0, temp = x;
while (temp >>= 1) result++;
return result;
}
static inline int intpow2(int x) {
int result = 1, temp = x;
result = result << temp;
return result;
}
int exchange (MPI_Comm comm2d, int npx, int npy, long long int sizex, long long int sizey, int boundary, int iter_count, int iter_warmup)
{
long long int size, i, buf_size, msg_size, msg_size_bytes, packbuf_disp;
int neighbors = 4;
float *buf_u = NULL, *buf_v = NULL, **packbuf, **unpackbuf;
mp_reg_t *reg_pack, *reg_unpack;
#ifdef _VALIDATE_
int x, y;
float *buf_u_h = NULL, *buf_v_h = NULL;
#endif
int rreq_idx, sreq_idx, wait_idx, rreq_inflight, sreq_inflight, complete_sync_inflight, complete_sync_idx, complete_sync_wait;
mp_request_t *sreq = NULL, *rreq = NULL;
cudaEvent_t start_event, stop_event;
cudaEvent_t *send_sync_event;
cudaEvent_t *recv_sync_event;
cudaEvent_t *interior_sync_event;
float time_elapsed;
long int time_start, time_stop, time_prepost;
struct timespec start, stop;
cudaStream_t interior_stream;
cudaStream_t boundary_send_stream;
cudaStream_t boundary_recv_stream;
int complete_sreq_idx, complete_rreq_idx;
long long int boundary_log;
long long int sizex_log, sizey_log, sizexy_log;
float *compute_buf, *exchange_buf, *temp;
int prepost_depth_warmup, prepost_depth_iter;
size = sizex > sizey ? sizex : sizey;
buf_size = sizeof(float)*(sizex+2)*(sizey+2);
msg_size = size;
msg_size_bytes = size*sizeof(float);
prepost_depth_warmup = (prepost_depth < iter_warmup) ? prepost_depth : iter_warmup;
prepost_depth_iter = (prepost_depth < iter_count) ? prepost_depth : iter_count;
/*allocating requests*/
sreq_max_inflight = req_per_step*steps_per_batch*batches_inflight;
rreq_max_inflight = req_per_step*(steps_per_batch*batches_inflight + prepost_depth);
sreq = (mp_request_t *) malloc(sreq_max_inflight*sizeof(mp_request_t));
rreq = (mp_request_t *) malloc(rreq_max_inflight*sizeof(mp_request_t));
send_sync_event = (cudaEvent_t *) malloc (batches_inflight*steps_per_batch*sizeof(cudaEvent_t));
recv_sync_event = (cudaEvent_t *) malloc (batches_inflight*steps_per_batch*sizeof(cudaEvent_t));
interior_sync_event = (cudaEvent_t *) malloc (batches_inflight*steps_per_batch*sizeof(cudaEvent_t));
packbuf = (float **) malloc (sizeof(float *)*buffering);
unpackbuf = (float **) malloc (sizeof(float *)*buffering);
reg_pack = (mp_reg_t *) malloc (sizeof(mp_reg_t)*buffering);
reg_unpack = (mp_reg_t *) malloc (sizeof(mp_reg_t)*buffering);
CUDA_CHECK(cudaMalloc((void **)&buf_u, buf_size));
CUDA_CHECK(cudaMalloc((void **)&buf_v, buf_size));
for (i=0; i<buffering; i++) {
CUDA_CHECK(cudaMalloc((void **)&packbuf[i], msg_size_bytes*neighbors));
CUDA_CHECK(cudaMemset(packbuf[i], 0, msg_size_bytes*neighbors));
mp_register(packbuf[i], msg_size_bytes*neighbors, ®_pack[i]);
CUDA_CHECK(cudaMalloc((void **)&unpackbuf[i], msg_size_bytes*neighbors));
CUDA_CHECK(cudaMemset(unpackbuf[i], 0, msg_size_bytes*neighbors));
mp_register(unpackbuf[i], msg_size_bytes*neighbors, ®_unpack[i]);
}
#ifdef _VALIDATE_
buf_u_h = malloc (buf_size);
buf_v_h = malloc (buf_size);
memset(buf_u_h, 0, buf_size);
memset(buf_v_h, 0, buf_size);
for (x = 0; x < sizex; x++) {
for (y = 0; y < sizey; y++) {
*(buf_u_h + (x+1)*(sizey+2) + (y+1))
= 1.0;
*(buf_v_h + (x+1)*(sizey+2) + (y+1))
= 1.0;
}
}
cudaMemcpy (buf_u, buf_u_h, buf_size, cudaMemcpyHostToDevice);
cudaMemcpy (buf_v, buf_v_h, buf_size, cudaMemcpyHostToDevice);
#endif
sizex_log = intlog2(sizex);
sizey_log = intlog2(sizey);
sizexy_log = intlog2(sizex*sizey);
boundary_log = intlog2(boundary);
copytosymbol (sizex, sizey, boundary, sizex_log, sizey_log, boundary_log, sizexy_log);
CUDA_CHECK(cudaEventCreate(&start_event));
CUDA_CHECK(cudaEventCreate(&stop_event));
for (i=0; i<batches_inflight*steps_per_batch; i++) {
CUDA_CHECK(cudaEventCreateWithFlags(&send_sync_event[i], cudaEventDisableTiming));
CUDA_CHECK(cudaEventCreateWithFlags(&recv_sync_event[i], cudaEventDisableTiming));
CUDA_CHECK(cudaEventCreateWithFlags(&interior_sync_event[i], cudaEventDisableTiming));
}
int least, greatest;
CUDA_CHECK(cudaDeviceGetStreamPriorityRange(&least, &greatest));
#ifndef _USE_NONBLOCKING_STREAMS_
CUDA_CHECK(cudaStreamCreate(&interior_stream));
CUDA_CHECK(cudaStreamCreate(&boundary_send_stream));
CUDA_CHECK(cudaStreamCreate(&boundary_recv_stream));
#else
#ifdef _USE_STREAM_PRIORITY_
CUDA_CHECK(cudaStreamCreateWithPriority(&interior_stream, cudaStreamNonBlocking, least));
CUDA_CHECK(cudaStreamCreateWithPriority(&boundary_send_stream, cudaStreamNonBlocking, greatest));
CUDA_CHECK(cudaStreamCreateWithPriority(&boundary_recv_stream, cudaStreamNonBlocking, greatest));
#else
CUDA_CHECK(cudaStreamCreateWithFlags(&interior_stream, cudaStreamNonBlocking));
CUDA_CHECK(cudaStreamCreateWithFlags(&boundary_send_stream, cudaStreamNonBlocking));
CUDA_CHECK(cudaStreamCreateWithFlags(&boundary_recv_stream, cudaStreamNonBlocking));
#endif
#endif
CUDA_CHECK(cudaDeviceSynchronize());
compute_buf = buf_u;
exchange_buf = buf_v;
rreq_idx = 0;
sreq_idx = 0;
complete_sreq_idx = 0;
complete_rreq_idx = 0;
rreq_inflight = 0;
sreq_inflight = 0;
complete_sync_inflight = 0;
complete_sync_idx = 0;
complete_sync_wait = 0;
int doublebuf_idx;
/*warmup steps*/
for (i=0; i<prepost_depth_warmup; i++) {
doublebuf_idx = i%buffering;
packbuf_disp = 0;
/*y dim*/
if (left != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, left, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (right != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, right, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
/*x dim*/
if (bottom != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, bottom, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (top != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, top, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
}
MPI_Barrier(MPI_COMM_WORLD);
for (i = 0; i < iter_warmup; i++) {
doublebuf_idx = i%buffering;
/*pack data*/
boundary_pack (packbuf[doublebuf_idx], exchange_buf, sizex, sizey, threadsperblock, boundary_send_stream);
/*launch interior compute*/
interior_compute (compute_buf, exchange_buf, sizex, sizey, boundary, threadsperblock, gridsize, interior_stream);
/*post all sends*/
packbuf_disp = 0;
/*prepare and post requires requests to be contiguous, check if there is a wrap around*/
int sreq_idx_start = sreq_idx;
if ((sreq_idx_start + req_per_step) > sreq_max_inflight) {
fprintf(stderr, "sreq status array looping around in middle of a step: sreq_idx_start: %d sreq_max_inflight: %d \n",
sreq_idx_start, sreq_max_inflight);
exit(-1);
}
/*prepare all sends*/
/*y dim*/
if (right != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, right, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
packbuf_disp += msg_size;
if (left != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, left, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
packbuf_disp += msg_size;
/*x dim*/
if (top != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, top, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
packbuf_disp += msg_size;
if (bottom != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, bottom, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
/*post sends on stream*/
mp_isend_post_all_on_stream (req_per_step, &sreq[sreq_idx_start], boundary_send_stream);
/*post wait for recv on the stream*/
wait_idx = (i*req_per_step)%rreq_max_inflight;
mp_wait_all_on_stream(req_per_step, &rreq[wait_idx], boundary_recv_stream);
/*unpack data*/
boundary_unpack (exchange_buf, unpackbuf[doublebuf_idx], sizex, sizey, threadsperblock, boundary_recv_stream);
/*launch boundary computation*/
boundary_compute (compute_buf, exchange_buf, sizex, sizey, boundary, threadsperblock, gridsize, boundary_recv_stream);
/*recv and send both signal event A and B, than both go wait for the same event C
interior waits for A and B, then signals C*/
CUDA_CHECK(cudaEventRecord(send_sync_event[complete_sync_idx], boundary_send_stream));
CUDA_CHECK(cudaEventRecord(recv_sync_event[complete_sync_idx], boundary_recv_stream));
CUDA_CHECK(cudaStreamWaitEvent(interior_stream, recv_sync_event[complete_sync_idx], 0));
CUDA_CHECK(cudaStreamWaitEvent(interior_stream, send_sync_event[complete_sync_idx], 0));
CUDA_CHECK(cudaEventRecord(interior_sync_event[complete_sync_idx], interior_stream));
CUDA_CHECK(cudaStreamWaitEvent(boundary_send_stream, interior_sync_event[complete_sync_idx], 0));
CUDA_CHECK(cudaStreamWaitEvent(boundary_recv_stream, interior_sync_event[complete_sync_idx], 0));
complete_sync_inflight++;
complete_sync_idx = (complete_sync_idx + 1)%(batches_inflight*steps_per_batch);
assert(complete_sync_inflight <= batches_inflight*steps_per_batch);
/*synchronize on oldest batch*/
if (complete_sync_inflight == batches_inflight*steps_per_batch) {
complete_sync_wait = (complete_sync_wait + steps_per_batch - 1)%(batches_inflight*steps_per_batch);
CUDA_CHECK(cudaEventSynchronize(send_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(recv_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(interior_sync_event[complete_sync_wait]));
complete_sync_wait = (complete_sync_wait + 1)%(batches_inflight*steps_per_batch);
complete_sync_inflight = complete_sync_inflight - steps_per_batch;
while (rreq_inflight > req_per_step*(steps_per_batch*(batches_inflight - 1) + prepost_depth_warmup)) {
mp_wait(&rreq[complete_rreq_idx]);
complete_rreq_idx = (complete_rreq_idx + 1)%rreq_max_inflight;
rreq_inflight--;
}
while (sreq_inflight > req_per_step*steps_per_batch*(batches_inflight - 1)) {
mp_wait(&sreq[complete_sreq_idx]);
complete_sreq_idx = (complete_sreq_idx + 1)%sreq_max_inflight;
sreq_inflight--;
}
}
/*prepost recv for a future step*/
if ((i+prepost_depth_warmup) < iter_warmup) {
doublebuf_idx = (i+prepost_depth_warmup)%buffering;
packbuf_disp = 0;
/*y dim*/
if (left != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, left, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (right != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, right, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
/*x dim*/
if (bottom != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, bottom, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (top != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, top, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
}
/*if its the last iteration, synchronize on all batches*/
if (i == (iter_warmup - 1)) {
if (complete_sync_inflight > 0) {
complete_sync_wait = (complete_sync_wait + complete_sync_inflight - 1)%(batches_inflight*steps_per_batch);
CUDA_CHECK(cudaEventSynchronize(send_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(recv_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(interior_sync_event[complete_sync_wait]));
complete_sync_inflight = 0;
}
while (rreq_inflight > 0) {
mp_wait(&rreq[complete_rreq_idx]);
complete_rreq_idx = (complete_rreq_idx + 1)%rreq_max_inflight;
rreq_inflight--;
}
while (sreq_inflight > 0) {
mp_wait(&sreq[complete_sreq_idx]);
complete_sreq_idx = (complete_sreq_idx + 1)%sreq_max_inflight;
sreq_inflight--;
}
}
/*interchange the compute and communication buffers*/
temp = exchange_buf;
exchange_buf = compute_buf;
compute_buf = temp;
}
#ifdef _REPEAT_TIMED_LOOP_
int reps_count = 10, rep;
if (getenv("REPS_COUNT") != NULL) {
reps_count = atoi(getenv("REPS_COUNT"));
}
for (rep = 0; rep < reps_count; rep++) {
#endif
CUDA_CHECK(cudaDeviceSynchronize());
rreq_idx = 0;
sreq_idx = 0;
complete_sreq_idx = 0;
complete_rreq_idx = 0;
rreq_inflight = 0;
sreq_inflight = 0;
complete_sync_inflight = 0;
complete_sync_idx = 0;
complete_sync_wait = 0;
MPI_Barrier(MPI_COMM_WORLD);
/*timed iterations*/
clock_gettime(CLOCK_REALTIME, &start);
#ifndef _FREE_NETWORK_
for (i=0; i<prepost_depth_iter; i++) {
doublebuf_idx = i%buffering;
packbuf_disp = 0;
/*y dim*/
if (left != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, left, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (right != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, right, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
/*x dim*/
if (bottom != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, bottom, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (top != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, top, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
}
#endif
clock_gettime(CLOCK_REALTIME, &stop);
time_prepost = stop.tv_nsec - start.tv_nsec; //(time_stop - time_start);
#if defined (_ENABLE_DRPROF_)
const char *tags = "interior|pack|prepsend|postsend|postwait|unpack|boundary|postsync|waitsync|postrecv";
if (prof_init(&prof, 1000, 1000, "1us", 50, 1, tags)) {
fprintf(stderr, "error in prof_init init.\n");
exit(-1);
}
prof_start = 1;
#endif
MPI_Barrier(MPI_COMM_WORLD);
CUDA_CHECK(cudaEventRecord(start_event, 0));
for (i = 0; i < iter_count; i++) {
doublebuf_idx = i%buffering;
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#ifndef _FREE_PACK_
/*pack data*/
boundary_pack (packbuf[doublebuf_idx], exchange_buf, sizex, sizey, threadsperblock, boundary_send_stream);
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#ifndef _FREE_INTERIOR_COMPUTE_
/*launch interior compute*/
interior_compute (compute_buf, exchange_buf, sizex, sizey, boundary, threadsperblock, gridsize, interior_stream);
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
/*post all sends*/
packbuf_disp = 0;
#ifndef _FREE_NETWORK_
/*prepare and post requires requests to be contiguous, check if there is a wrap around*/
int sreq_idx_start = sreq_idx;
if ((sreq_idx_start + req_per_step) > sreq_max_inflight) {
fprintf(stderr, "sreq status array looping around in middle of a step: sreq_idx_start: %d sreq_max_inflight: %d \n",
sreq_idx_start, sreq_max_inflight);
exit(-1);
}
/*prepare all sends*/
/*y dim*/
if (right != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, right, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
packbuf_disp += msg_size;
if (left != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, left, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
packbuf_disp += msg_size;
/*x dim*/
if (top != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, top, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
packbuf_disp += msg_size;
if (bottom != MPI_PROC_NULL) {
mp_send_prepare((void *)(packbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, bottom, ®_pack[doublebuf_idx],
&sreq[sreq_idx]);
sreq_idx = (sreq_idx + 1)%sreq_max_inflight;
sreq_inflight++;
}
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#ifndef _FREE_NETWORK_
/*post sends on stream*/
mp_isend_post_all_on_stream (req_per_step, &sreq[sreq_idx_start], boundary_send_stream);
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#ifndef _FREE_NETWORK_
/*post wait for recv on the stream*/
wait_idx = (i*req_per_step)%rreq_max_inflight;
mp_wait_all_on_stream(req_per_step, &rreq[wait_idx], boundary_recv_stream);
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#ifndef _FREE_PACK_
/*unpack data*/
boundary_unpack (exchange_buf, unpackbuf[doublebuf_idx], sizex, sizey, threadsperblock, boundary_recv_stream);
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#ifndef _FREE_BOUNDARY_COMPUTE_
/*launch boundary computation*/
boundary_compute (compute_buf, exchange_buf, sizex, sizey, boundary, threadsperblock, gridsize, boundary_recv_stream);
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#ifndef _FREE_SYNC_
/*recv and send both signal event A and B, than both go wait for the same event C
*interior waits for A and B, then signals C*/
CUDA_CHECK(cudaEventRecord(send_sync_event[complete_sync_idx], boundary_send_stream));
CUDA_CHECK(cudaEventRecord(recv_sync_event[complete_sync_idx], boundary_recv_stream));
CUDA_CHECK(cudaStreamWaitEvent(interior_stream, recv_sync_event[complete_sync_idx], 0));
CUDA_CHECK(cudaStreamWaitEvent(interior_stream, send_sync_event[complete_sync_idx], 0));
CUDA_CHECK(cudaEventRecord(interior_sync_event[complete_sync_idx], interior_stream));
CUDA_CHECK(cudaStreamWaitEvent(boundary_send_stream, interior_sync_event[complete_sync_idx], 0));
CUDA_CHECK(cudaStreamWaitEvent(boundary_recv_stream, interior_sync_event[complete_sync_idx], 0));
#endif
complete_sync_inflight++;
complete_sync_idx = (complete_sync_idx + 1)%(batches_inflight*steps_per_batch);
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
assert(complete_sync_inflight <= batches_inflight*steps_per_batch);
/*synchronize on oldest batch*/
if (complete_sync_inflight == batches_inflight*steps_per_batch) {
complete_sync_wait = (complete_sync_wait + steps_per_batch - 1)%(batches_inflight*steps_per_batch);
#ifndef _FREE_SYNC_
CUDA_CHECK(cudaEventSynchronize(recv_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(send_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(interior_sync_event[complete_sync_wait]));
#endif
complete_sync_wait = (complete_sync_wait + 1)%(batches_inflight*steps_per_batch);
complete_sync_inflight = complete_sync_inflight - steps_per_batch;
#ifndef _FREE_NETWORK_
while (rreq_inflight > req_per_step*(steps_per_batch*(batches_inflight - 1) + prepost_depth_iter)) {
mp_wait(&rreq[complete_rreq_idx]);
complete_rreq_idx = (complete_rreq_idx + 1)%rreq_max_inflight;
rreq_inflight--;
}
while (sreq_inflight > req_per_step*steps_per_batch*(batches_inflight - 1)) {
mp_wait(&sreq[complete_sreq_idx]);
complete_sreq_idx = (complete_sreq_idx + 1)%sreq_max_inflight;
sreq_inflight--;
}
#endif
}
/*prepost recv for a future step*/
#ifndef _FREE_NETWORK_
if ((i+prepost_depth_iter) < iter_count) {
doublebuf_idx = (i+prepost_depth_iter)%buffering;
packbuf_disp = 0;
/*y dim*/
if (left != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, left, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (right != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, right, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
/*x dim*/
if (bottom != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, bottom, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
packbuf_disp += msg_size;
if (top != MPI_PROC_NULL) {
mp_irecv((void *)(unpackbuf[doublebuf_idx] + packbuf_disp),
msg_size_bytes, top, ®_unpack[doublebuf_idx],
&rreq[rreq_idx]);
rreq_idx = (rreq_idx + 1)%rreq_max_inflight;
rreq_inflight++;
}
}
#endif
/*if its the last iteration, synchronize on all batches*/
if (i == (iter_count - 1)) {
if (complete_sync_inflight > 0) {
complete_sync_wait = (complete_sync_wait + complete_sync_inflight - 1)%(batches_inflight*steps_per_batch);
#ifndef _FREE_SYNC_
CUDA_CHECK(cudaEventSynchronize(send_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(recv_sync_event[complete_sync_wait]));
CUDA_CHECK(cudaEventSynchronize(interior_sync_event[complete_sync_wait]));
#endif
complete_sync_inflight = 0;
}
#ifndef _FREE_NETWORK_
while (rreq_inflight > 0) {
mp_wait(&rreq[complete_rreq_idx]);
complete_rreq_idx = (complete_rreq_idx + 1)%rreq_max_inflight;
rreq_inflight--;
}
while (sreq_inflight > 0) {
mp_wait(&sreq[complete_sreq_idx]);
complete_sreq_idx = (complete_sreq_idx + 1)%sreq_max_inflight;
sreq_inflight--;
}
#endif
}
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
#endif
#if defined (_ENABLE_DRPROF_)
PROF(&prof, prof_idx++);
prof_update(&prof);
prof_idx = 0;
#endif
/*interchange the compute and communication buffers*/
temp = exchange_buf;
exchange_buf = compute_buf;
compute_buf = temp;
}
CUDA_CHECK(cudaEventRecord(stop_event, 0));
CUDA_CHECK(cudaEventSynchronize(stop_event));
CUDA_CHECK(cudaEventElapsedTime(&time_elapsed, start_event, stop_event));
if (comm_rank == 0) {
#ifdef _REPEAT_TIMED_LOOP_
fprintf(stdout, "%dx%d %3lld %8.2lf usec \n", npx, npy, rep, (time_elapsed*1e3 + (time_prepost/1000))/iter_count);
#else
fprintf(stdout, "%dx%d %8.2lf usec \n", npx, npy, (time_elapsed*1e3 + (time_prepost/1000))/iter_count);
#endif
#if defined (_ENABLE_DRPROF_)
fprintf(stdout, "Prepost depth: %d latency: %ld nsec \n", prepost_depth_iter, time_prepost);
prof_dump(&prof);
#if defined (_ENABLE_DRPROF_ISEND_)
prof_dump(&prof_isend_prepare);
#endif
#endif
}
#ifdef _REPEAT_TIMED_LOOP_
}
#ifdef _VALIDATE_
iter_count = iter_count*reps_count;
#endif
#endif
#ifdef _VALIDATE_
emulate_on_host (buf_u_h, buf_v_h, sizex, sizey, boundary, 1/*ghost*/,
comm_rank, left, right, bottom, top, (iter_count + iter_warmup), comm2d);
cudaMemcpy (buf_u_h, buf_u, buf_size, cudaMemcpyDeviceToHost);
cudaMemcpy (buf_v_h, buf_v, buf_size, cudaMemcpyDeviceToHost);
validate (buf_u_h, buf_v_h, sizex, sizey, 1);
#endif
CUDA_CHECK(cudaFree(buf_u));
CUDA_CHECK(cudaFree(buf_v));
for (i=0; i<buffering; i++) {
CUDA_CHECK(cudaFree(packbuf[i]));
mp_deregister(®_pack[i]);
CUDA_CHECK(cudaFree(unpackbuf[i]));
mp_deregister(®_unpack[i]);
}
CUDA_CHECK(cudaEventDestroy(start_event));
CUDA_CHECK(cudaEventDestroy(stop_event));
CUDA_CHECK(cudaStreamDestroy(interior_stream));
CUDA_CHECK(cudaStreamDestroy(boundary_send_stream));
CUDA_CHECK(cudaStreamDestroy(boundary_recv_stream));
for (i=0; i<batches_inflight*steps_per_batch; i++) {
CUDA_CHECK(cudaEventDestroy(send_sync_event[i]));
CUDA_CHECK(cudaEventDestroy(recv_sync_event[i]));
CUDA_CHECK(cudaEventDestroy(interior_sync_event[i]));
}
free(sreq);
free(rreq);
return 0;
}
int main (int c, char *v[])
{
int iter_count, iter_count_large, iter_warmup, iter_warmup_large;
int dim[2], period[2];
int reorder, boundary_compute_width;
int npx, npy, sizex, sizey, count;
MPI_Comm comm2d;
px=4;
py=4;
#if defined (_VALIDATE_)
iter_count=iter_count_large=30;
iter_warmup=iter_warmup_large=10;
#else
iter_count=iter_count_large=200;
iter_warmup=iter_warmup_large=20;
#endif
boundary_compute_width = default_boundary;
if (getenv("PX") != NULL) {
px = atoi(getenv("PX"));
}
if (getenv("PY") != NULL) {
py = atoi(getenv("PY"));
}
if (getenv("MAX_SIZE") != NULL) {
max_size = atoi(getenv("MAX_SIZE"));
}
if (getenv("MIN_SIZE") != NULL) {
min_size = atoi(getenv("MIN_SIZE"));
}
if (getenv("COMM_SIZE") != NULL) {
max_comm_size = atoi(getenv("COMM_SIZE"));
}
if (getenv("ITER_COUNT") != NULL) {
iter_count = atoi(getenv("ITER_COUNT"));
}
if (getenv("WARMUP_COUNT") != NULL) {
iter_warmup = atoi(getenv("WARMUP_COUNT"));
}
if (getenv("ITER_COUNT_LARGE") != NULL) {
iter_count_large = atoi(getenv("ITER_COUNT_LARGE"));
}
if (getenv("WARMUP_COUNT_LARGE") != NULL) {
iter_warmup_large = atoi(getenv("WARMUP_COUNT_LARGE"));
}
if (getenv("BOUNDARY_COMPUTE_WIDTH") != NULL) {
boundary_compute_width = atoi(getenv("BOUNDARY_COMPUTE_WIDTH"));
}
if (getenv("CUDA_THREADS_PER_BLOCK") != NULL) {
threadsperblock = atoi(getenv("CUDA_THREADS_PER_BLOCK"));
}
if (getenv("CUDA_GRID_SIZE") != NULL) {
gridsize = atoi(getenv("CUDA_GRID_SIZE"));
}
if (getenv("ITERS_PER_BATCH") != NULL) {
steps_per_batch = atoi(getenv("ITERS_PER_BATCH"));
prepost_depth = steps_per_batch;
}
if (getenv("BATCHES_INFLIGHT") != NULL) {
batches_inflight = atoi(getenv("BATCHES_INFLIGHT"));
}
if (getenv("BUFFERING") != NULL) {
buffering = atoi(getenv("BUFFERING"));
}
int dev_count = 0, dev_id = 0;
CUDA_CHECK(cudaGetDeviceCount(&dev_count));
if (dev_count <= 0) {
fprintf(stderr, "no CUDA devices found \n");
exit(-1);
}
MPI_Init(&c, &v);
MPI_Comm_size(MPI_COMM_WORLD, &comm_size);
MPI_Comm_rank(MPI_COMM_WORLD, &comm_rank);
if (comm_size != px*py) {
fprintf(stderr, "comm size and number of processes do not match \n");
fprintf(stderr, "comm_size = %d, px = %d, py = %d\n",
comm_size, px, py);
exit(-1);
}
int local_rank = 0;
if (getenv("MV2_COMM_WORLD_LOCAL_RANK") != NULL) {
local_rank = atoi(getenv("MV2_COMM_WORLD_LOCAL_RANK"));
}
dev_id = local_rank%dev_count;
if (getenv("USE_GPU") != NULL) {
dev_id = atoi(getenv("USE_GPU"));
if (dev_id > dev_count) {
fprintf(stderr, "Invalid device ID, falling back to roundrobin binding\n");
dev_id = local_rank%dev_count;
}
}
cudaSetDevice(dev_id);
fprintf(stderr, "[%d] using GPU device: %d \n", comm_rank, dev_id);
/*create the stencil communicator*/
dim[0] = py;
dim[1] = px;
period[0] = 1;
period[1] = 1;
reorder = 0;
MPI_Cart_create (MPI_COMM_WORLD, 2, dim, period, reorder, &comm2d);
MPI_Cart_shift(comm2d, 0, 1, &left, &right );
MPI_Cart_shift(comm2d, 1, 1, &bottom, &top );
MPI_Comm_rank(comm2d, &comm_rank);
fprintf(stderr, "[%d] size: %lld left: %d right: %d top: %d bottom: %d iters_per_batch: %d batches_inflight: %d buffering: %d iter_count: %d iter_warmup: %d\n", comm_rank, max_size, left, right, top, bottom, steps_per_batch, batches_inflight, buffering, iter_count, iter_warmup);
if (left != MPI_PROC_NULL) {
req_per_step++;
peers[peer_count] = left;
peer_count++;
}
if (right != MPI_PROC_NULL) {
req_per_step++;
if (right != left) {
peers[peer_count] = right;
peer_count++;
}
}
if (top != MPI_PROC_NULL) {
req_per_step++;
peers[peer_count] = top;
peer_count++;
}
if (bottom != MPI_PROC_NULL) {
req_per_step++;
if (bottom != top) {
peers[peer_count] = bottom;
peer_count++;
}
}
MPI_Cart_coords(comm2d, comm_rank, 2, rank_coords);
cudaFree(0);
MPI_Barrier(MPI_COMM_WORLD);
/*setup IB communication infrastructure*/
int ret = MP_SUCCESS;
ret = mp_init (comm2d, peers, peer_count, MP_INIT_DEFAULT, dev_id);
if (ret != MP_SUCCESS) {
fprintf(stderr, "mp_init returned error \n");
exit(-1);
}
if (min_size < 4*boundary_compute_width)
min_size = 4*boundary_compute_width;
if (comm_rank == 0) {
fprintf(stderr, "Size \t time_elapsed \n");
}