1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
18 void usage(char *prog)
20 printf("usage: %s {-o|-m|-l<tgt>} filenamefmt count\n", prog);
21 printf(" %s {-o|-m|-l<tgt>} filenamefmt -seconds\n", prog);
22 printf(" %s {-o|-m|-l<tgt>} filenamefmt start count\n", prog);
25 /* Print process rank, loop count, message, and exit (i.e. a fatal error) */
26 int rprintf(int rank, int loop, const char *fmt, ...)
30 printf("rank %d, loop %d: ", rank, loop);
40 int main(int argc, char ** argv)
42 int i, rc = 0, do_open = 0, do_link = 0, rank;
43 char format[4096], *fmt, *tgt;
45 long start, last, end;
46 long begin = 0, count;
48 rc = MPI_Init(&argc, &argv);
49 if (rc != MPI_SUCCESS)
50 rprintf(-1, -1, "MPI_Init failed: %d\n", rc);
52 if (argc < 4 || argc > 5) {
57 if (strcmp(argv[1], "-o") == 0) {
59 } else if (strncmp(argv[1], "-l", 2) == 0 && argv[1][2]) {
62 } else if (strcmp(argv[1], "-m") != 0) {
67 if (strlen(argv[2]) > 4080) {
68 printf("name too long\n");
72 rc = MPI_Comm_rank(MPI_COMM_WORLD, &rank);
73 if (rc != MPI_SUCCESS)
74 rprintf(-1, -1, "MPI_Comm_rank failed: %d\n", rc);
76 rc = MPI_Barrier(MPI_COMM_WORLD);
77 if (rc != MPI_SUCCESS)
78 rprintf(rank, -1, "prep MPI_Barrier failed: %d\n", rc);
80 start = last = time(0);
83 end = strtol(argv[3], NULL, 0);
85 begin = strtol(argv[3], NULL, 0);
86 end = strtol(argv[4], NULL, 0);
96 if (strchr(argv[2], '%'))
99 sprintf(format, "%s%%d", argv[2]);
102 printf("starting at %s", ctime(&start));
103 for (i = 0; i < count && time(0) < end; i++, begin++) {
104 sprintf(filename, fmt, begin);
106 int fd = open(filename, O_CREAT|O_RDWR, 0644);
108 printf("open(%s) error: %s\n", filename,
114 } else if (do_link) {
115 rc = link(tgt, filename);
117 printf("link(%s, %s) error: %s\n",
118 tgt, filename, strerror(errno));
123 rc = mknod(filename, S_IFREG| 0444, 0);
125 printf("mknod(%s) error: %s\n",
126 filename, strerror(errno));
131 if ((i % 10000) == 0) {
132 printf(" - created %d (time %ld total %ld last %ld)\n",
133 i, time(0), time(0) - start, time(0) - last);
137 printf("total: %d creates in %ld seconds: %f creates/second\n", i,
138 time(0) - start, ((float)i / (time(0) - start)));
140 printf("finish at %s", ctime(&start));