339 lines
8.5 KiB
C
Executable File
339 lines
8.5 KiB
C
Executable File
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/mman.h>
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#include <mpi.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <sys/syscall.h> /* For SYS_xxx definitions */
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#include <sched.h>
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//#define DEBUG
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#ifdef DEBUG
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#define dprintf printf
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#else
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#define dprintf {}
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#endif
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#define DIFFNSEC(end, start) ((end.tv_sec - start.tv_sec) * 1000000000UL + (end.tv_nsec - start.tv_nsec))
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#if 1
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#define BEGIN_EPOCH(win) do { MPI_Win_fence(0, win); } while(0)
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#define END_EPOCH(win) do { MPI_Win_fence(0, win); } while(0)
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#define BAR_EPOCH do { } while(0)
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#else
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#define BEGIN_EPOCH(win) do { MPI_Win_lock_all(0, win); } while(0)
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#define END_EPOCH(win) do { MPI_Win_unlock_all(win); } while(0)
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#define BAR_EPOCH do { MPI_Barrier(MPI_COMM_WORLD); } while(0)
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#endif
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static inline void fixed_size_work() {
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asm volatile(
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"movq $0, %%rcx\n\t"
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"1:\t"
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"addq $1, %%rcx\n\t"
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"cmpq $99, %%rcx\n\t"
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"jle 1b\n\t"
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:
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:
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: "rcx", "cc");
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}
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static inline void bulk_fsw(unsigned long n) {
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int j;
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for (j = 0; j < (n); j++) {
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fixed_size_work();
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}
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}
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double nspw; /* nsec per work */
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unsigned long nsec;
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void fwq_init() {
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struct timespec start, end;
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int i;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &start);
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#define N_INIT 10000000
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bulk_fsw(N_INIT);
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end);
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nsec = DIFFNSEC(end, start);
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nspw = nsec / (double)N_INIT;
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}
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#if 1
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void fwq(long delay_nsec) {
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if (delay_nsec < 0) {
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return;
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//printf("%s: delay_nsec < 0\n", __FUNCTION__);
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}
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bulk_fsw(delay_nsec / nspw);
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}
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#else /* For machines with large core-to-core performance variation (e.g. OFP) */
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void fwq(long delay_nsec) {
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struct timespec start, end;
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if (delay_nsec < 0) { return; }
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &start);
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while (1) {
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end);
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if (DIFFNSEC(end, start) >= delay_nsec) {
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break;
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}
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bulk_fsw(2); /* ~150 ns per iteration on FOP */
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}
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}
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#endif
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static int print_cpu_last_executed_on() {
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char fn[256];
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char* result;
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pid_t tid = syscall(SYS_gettid);
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int fd;
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int offset;
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int mpi_errno = 0;
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sprintf(fn, "/proc/%d/task/%d/stat", getpid(), (int)tid);
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//printf("fn=%s\n", fn);
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fd = open(fn, O_RDONLY);
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if(fd == -1) {
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printf("open() failed\n");
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goto fn_fail;
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}
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result = malloc(65536);
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if(result == NULL) {
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printf("malloc() failed");
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goto fn_fail;
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}
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int amount = 0;
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offset = 0;
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while(1) {
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amount = read(fd, result + offset, 65536);
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// printf("amount=%d\n", amount);
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if(amount == -1) {
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printf("read() failed");
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goto fn_fail;
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}
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if(amount == 0) {
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goto eof;
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}
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offset += amount;
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}
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eof:;
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//printf("result:%s\n", result);
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char* next_delim = result;
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char* field;
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int i;
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for(i = 0; i < 39; i++) {
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field = strsep(&next_delim, " ");
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}
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int cpu = sched_getcpu();
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if(cpu == -1) {
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printf("getpu() failed\n");
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goto fn_fail;
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}
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printf("compute thread,pmi_rank=%02d,stat-cpu=%02d,sched_getcpu=%02d,tid=%d\n", atoi(getenv("PMI_RANK")), atoi(field), cpu, tid); fflush(stdout);
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fn_exit:
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free(result);
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return mpi_errno;
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fn_fail:
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mpi_errno = -1;
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goto fn_exit;
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}
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static inline int on_same_node(int ppn, int me, int you) {
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return (me / ppn == you / ppn);
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}
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/* fence-accumulate-calc-fence */
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void accumulate(int nproc, int ppn, int rank, double *wbuf, double *rbuf, int ndoubles, MPI_Win win, long calc_nsec) {
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int i, j;
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int r = 0, s = 0;
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int req = 0;
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BEGIN_EPOCH(win);
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for (i = 0; i < nproc; i++) {
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if (!on_same_node(ppn, rank, i)) {
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for (j = 0; j < ndoubles; j++) {
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//printf("i=%d,j=%d,rbuf=%f,wbuf=%f\n", i, j, rbuf[i * ndoubles + j], wbuf[i * ndoubles + j]);
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MPI_Accumulate(rbuf + i * ndoubles + j, 1, MPI_DOUBLE, i, i * ndoubles + j, 1, MPI_DOUBLE, MPI_SUM, win);
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}
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}
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}
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fwq(calc_nsec);
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END_EPOCH(win);
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}
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static struct option options[] = {
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{
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.name = "ppn",
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.has_arg = required_argument,
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.flag = NULL,
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.val = 'P',
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},
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/* end */
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{ NULL, 0, NULL, 0, },
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};
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int main(int argc, char **argv) {
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int rc;
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int actual;
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int ppn = -1;
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int nproc;
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int ndoubles = -1;
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int my_rank = -1, size = -1;
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int i, j;
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double *wbuf, *rbuf;
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MPI_Win win;
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struct timespec start, end;
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long t_fence_l, t_pure_l, t_overall_l;
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long t_fence, t_pure, t_overall;
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int opt;
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fwq_init();
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while ((opt = getopt_long(argc, argv, "+d:P:", options, NULL)) != -1) {
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switch (opt) {
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case 'd':
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ndoubles = (1ULL << atoi(optarg));
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break;
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case 'P':
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ppn = atoi(optarg);
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break;
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default: /* '?' */
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printf("unknown option %c\n", optopt);
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exit(1);
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}
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}
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if (ndoubles == -1 || ppn == -1) {
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printf("specify ndoubles with -d and ppn with --ppn");
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exit(1);
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}
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MPI_Init_thread(&argc, &argv, MPI_THREAD_MULTIPLE, &actual);
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if (actual != 3) {
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printf("ERROR: MPI_THREAD_MULTIPLE not available (level was set to %d)\n", actual);
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exit(1);
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}
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MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
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MPI_Comm_size(MPI_COMM_WORLD, &nproc);
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if (my_rank == 0) {
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printf("ndoubles=%d,nproc=%d\n", ndoubles, nproc);
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printf("nsec=%ld, nspw=%f\n", nsec, nspw);
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}
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/* write-to buffer */
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wbuf = malloc(sizeof(double) * ndoubles * nproc);
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if(!wbuf) { printf("malloc failed"); goto fn_fail; }
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memset(wbuf, 0, sizeof(double) * ndoubles * nproc);
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/* read-from buffer */
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rbuf = malloc(sizeof(double) * ndoubles * nproc);
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if(!rbuf) { printf("malloc failed"); goto fn_fail; }
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memset(rbuf, 0, sizeof(double) * ndoubles * nproc);
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if (rc = MPI_Win_create(wbuf, sizeof(double) * ndoubles * nproc, sizeof(double), MPI_INFO_NULL, MPI_COMM_WORLD, &win)) {
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printf("MPI_Win_create failed,rc=%d\n", rc);
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}
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print_cpu_last_executed_on();
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for (i = 0; i < nproc; i++) {
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for (j = 0; j < ndoubles; j++) {
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wbuf[i * ndoubles + j] = i + 1 + j;
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rbuf[i * ndoubles + j] = (i + 1) * 2 + j;
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}
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}
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#if 0
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for (i = 0; i < nproc; i++) {
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for (j = 0; j < ndoubles; j++) {
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printf("wbuf,proc=%d,j=%d,val=%f\n", i, j, wbuf[i * ndoubles + j]);
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printf("rbuf,proc=%d,j=%d,val=%f\n", i, j, rbuf[i * ndoubles + j]);
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}
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}
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#endif
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/* Measure fence-fence time */
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MPI_Barrier(MPI_COMM_WORLD);
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#define NSKIP 5
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#define NFENCE 30
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for (i = 0; i < NFENCE + NSKIP; i++) {
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if (i == NSKIP) {
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &start);
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}
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BEGIN_EPOCH(win);
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END_EPOCH(win);
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}
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BAR_EPOCH;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end);
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t_fence_l = DIFFNSEC(end, start) / NFENCE;
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//printf("t_fence (local): %ld usec\n", t_fence_l / 1000UL);
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MPI_Allreduce(&t_fence_l, &t_fence, 1, MPI_LONG, MPI_MAX, MPI_COMM_WORLD);
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if (my_rank == 0) printf("t_fence (max): %ld usec\n", t_fence / 1000UL);
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/* Measure fence-acc-fence time */
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MPI_Barrier(MPI_COMM_WORLD);
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#define NPURE 30
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for (i = 0; i < NPURE + NSKIP; i++) {
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if (i == NSKIP) {
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &start);
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}
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accumulate(nproc, ppn, my_rank, wbuf, rbuf, ndoubles, win, 0);
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}
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BAR_EPOCH;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end);
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t_pure_l = DIFFNSEC(end, start) / NPURE;
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//printf("t_pure (local): %ld usec\n", t_pure_l / 1000UL);
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MPI_Allreduce(&t_pure_l, &t_pure, 1, MPI_LONG, MPI_MAX, MPI_COMM_WORLD);
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if (my_rank == 0) printf("t_pure (max): %ld usec\n", t_pure / 1000UL);
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#if 0
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for (i = 0; i < nproc; i++) {
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for (j = 0; j < ndoubles; j++) {
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printf("wbuf,proc=%d,j=%d,val=%f\n", i, j, wbuf[i * ndoubles + j]);
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printf("rbuf,proc=%d,j=%d,val=%f\n", i, j, rbuf[i * ndoubles + j]);
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}
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}
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#endif
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/* Measure fenc-acc-calc-fence time */
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MPI_Barrier(MPI_COMM_WORLD);
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#define NOVERALL 30
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for (i = 0; i < NOVERALL + NSKIP; i++) {
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if (i == NSKIP) {
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &start);
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}
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accumulate(nproc, ppn, my_rank, wbuf, rbuf, ndoubles, win, t_pure - t_fence);
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}
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BAR_EPOCH;
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clock_gettime(CLOCK_THREAD_CPUTIME_ID, &end);
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t_overall_l = DIFFNSEC(end, start) / NOVERALL;
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//printf("t_overall (local): %ld usec\n", t_overall_l / 1000UL);
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MPI_Allreduce(&t_overall_l, &t_overall, 1, MPI_LONG, MPI_MAX, MPI_COMM_WORLD);
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if (my_rank == 0) printf("t_overall (max): %ld usec\n", t_overall / 1000UL);
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if (my_rank == 0) {
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long t_abs = (t_pure * 2) - t_overall;
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printf("overlap: %.2f %%\n", (t_abs * 100) / (double)t_pure);
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}
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fn_exit:
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MPI_Finalize();
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return 0;
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fn_fail:
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goto fn_exit;
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}
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