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Annotation of Net2/tests/benchmarks/seqwrite.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Sequential I/O benchmark.
        !             3:  */
        !             4: 
        !             5: #include <sys/types.h>
        !             6: #include <sys/file.h>
        !             7: #include <sys/stat.h>
        !             8: 
        !             9: char   *malloc();
        !            10: 
        !            11: main(argc, argv)
        !            12:        char *argv[];
        !            13: {
        !            14:        register int i, max;
        !            15:        char *buf;
        !            16:        struct stat sb;
        !            17:        int fd;
        !            18: 
        !            19:        if (argc < 3) {
        !            20:                printf("usage: %s file megabytes\n", argv[0]);
        !            21:                exit(1);
        !            22:        }
        !            23:        fd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC, 0644);
        !            24:        if (fd < 0) {
        !            25:                perror(argv[1]);
        !            26:                exit(1);
        !            27:        }
        !            28:        fstat(fd, &sb);
        !            29:        buf = malloc(sb.st_blksize);
        !            30:        max = (atoi(argv[2]) * 1024 * 1024) / sb.st_blksize;
        !            31:        printf("%d writes of %d kilobytes\n", max, sb.st_blksize / 1024);
        !            32:        for (i = 0; i < max; i++)
        !            33:                write(fd, buf, sb.st_blksize);
        !            34: }

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