| 1 | /* |
| 2 | * pipe2.c |
| 3 | * |
| 4 | * $DragonFly: src/test/sysperf/pipe2.c,v 1.5 2004/04/29 16:05:21 dillon Exp $ |
| 5 | */ |
| 6 | |
| 7 | #include "blib.h" |
| 8 | #include <sys/resource.h> |
| 9 | |
| 10 | #define PAGE_SIZE 4096 |
| 11 | #define PAGE_MASK (PAGE_SIZE - 1) |
| 12 | |
| 13 | int |
| 14 | main(int ac, char **av) |
| 15 | { |
| 16 | long long count = 0; |
| 17 | long long max; |
| 18 | char c; |
| 19 | int j; |
| 20 | int loops; |
| 21 | int bytes; |
| 22 | int ppri = 999; |
| 23 | int fds[2]; |
| 24 | char *buf; |
| 25 | char *ptr; |
| 26 | char *msg = "datarate"; |
| 27 | |
| 28 | if (ac == 1) { |
| 29 | fprintf(stderr, "%s blocksize[k,m] [pipe_writer_pri] [msg]\n", av[0]); |
| 30 | exit(1); |
| 31 | } |
| 32 | bytes = strtol(av[1], &ptr, 0); |
| 33 | if (*ptr == 'k' || *ptr == 'K') { |
| 34 | bytes *= 1024; |
| 35 | } else if (*ptr == 'm' || *ptr == 'M') { |
| 36 | bytes *= 1024 * 1024; |
| 37 | } else if (*ptr) { |
| 38 | fprintf(stderr, "Illegal numerical suffix: %s\n", ptr); |
| 39 | exit(1); |
| 40 | } |
| 41 | if (bytes <= 0) { |
| 42 | fprintf(stderr, "I can't handle %d sized buffers\n", bytes); |
| 43 | exit(1); |
| 44 | } |
| 45 | if (ac >= 3) |
| 46 | ppri = strtol(av[2], NULL, 0); |
| 47 | if (ac >= 4) |
| 48 | msg = av[3]; |
| 49 | |
| 50 | buf = mmap(NULL, bytes * 2 + PAGE_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANON, -1, 0); |
| 51 | if (buf == MAP_FAILED) { |
| 52 | perror("mmap/buffer"); |
| 53 | exit(1); |
| 54 | } |
| 55 | |
| 56 | bzero(buf, bytes * 2 + PAGE_SIZE); |
| 57 | |
| 58 | printf("tests one-way pipe using direct-write buffer\n"); |
| 59 | if (pipe(fds)) { |
| 60 | perror("pipe"); |
| 61 | exit(1); |
| 62 | } |
| 63 | if (fork() == 0) { |
| 64 | /* |
| 65 | * child process |
| 66 | */ |
| 67 | int n; |
| 68 | int i; |
| 69 | |
| 70 | close(fds[0]); |
| 71 | buf += (bytes + PAGE_MASK) & ~PAGE_MASK; |
| 72 | i = 0; |
| 73 | for (;;) { |
| 74 | n = read(fds[1], buf + i, bytes - i); |
| 75 | if (n <= 0) |
| 76 | break; |
| 77 | if (n + i == bytes) |
| 78 | i = 0; |
| 79 | else |
| 80 | i += n; |
| 81 | } |
| 82 | _exit(0); |
| 83 | } else { |
| 84 | /* |
| 85 | * parent process. |
| 86 | */ |
| 87 | if (ppri != 999) { |
| 88 | if (setpriority(PRIO_PROCESS, getpid(), ppri) < 0) { |
| 89 | perror("setpriority"); |
| 90 | exit(1); |
| 91 | } |
| 92 | } |
| 93 | close(fds[1]); |
| 94 | |
| 95 | /* |
| 96 | * Figure out how many loops it takes for 1 second's worth. |
| 97 | */ |
| 98 | start_timing(); |
| 99 | for (j = 0; ; ++j) { |
| 100 | if (write(fds[0], buf, bytes) != bytes) { |
| 101 | perror("write"); |
| 102 | exit(1); |
| 103 | } |
| 104 | if ((j & 31) == 0 && stop_timing(0, NULL)) |
| 105 | break; |
| 106 | } |
| 107 | loops = j * 2 + 1; |
| 108 | loops *= 2; |
| 109 | usleep(1000000 / 10); |
| 110 | start_timing(); |
| 111 | |
| 112 | for (j = loops; j; --j) { |
| 113 | if (write(fds[0], buf, bytes) != bytes) { |
| 114 | perror("write"); |
| 115 | exit(1); |
| 116 | } |
| 117 | } |
| 118 | close(fds[0]); |
| 119 | while(wait(NULL) >= 0) |
| 120 | ; |
| 121 | stop_timing(loops, "full duplex pipe / %dK bufs:", bytes / 1024); |
| 122 | printf("%s: blkSize %d %5.2f MBytes/sec\n", |
| 123 | msg, |
| 124 | bytes, |
| 125 | (double)loops * bytes * 1000000.0 / |
| 126 | (1024.0 * 1024.0 * get_timing())); |
| 127 | } |
| 128 | return(0); |
| 129 | } |
| 130 | |