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Linux磁盘测试的源代码,测试磁盘的读写性能

        of=filename      The output file to write.
        pf=filename      The data pattern file to use.
        bs=value         The block size to read/write.
        log=filename     The log file name to write.
        aios=value       Set number of AIO's to queue.
        align=offset     Set offset within page aligned buffer.
    or  align=rotate     Rotate data address through sizeof(ptr).
        dispose=mode     Set file dispose to: {delete or keep}.
        dlimit=value     Set the dump data buffer limit.
        dtype=string     Set the device type being tested.
        idtype=string    Set input device type being tested.
        odtype=string    Set output device type being tested.
        dsize=value      Set the device block (sector) size.
        errors=value     The number of errors to tolerate.
        files=value      Set number of tape files to process.
        flow=type        Set flow to: none, cts_rts, or xon_xoff.
        incr=value       Set number of record bytes to increment.
    or  incr=variable    Enables variable I/O request sizes.
        iodir=direction  Set I/O direction to: {forward or reverse}.
        iomode=mode      Set I/O mode to: {copy, test, or verify}.
        iotype=type      Set I/O type to: {random or sequential}.
        min=value        Set the minumum record size to transfer.
        max=value        Set the maximum record size to transfer.
        lba=value        Set starting block used w/lbdata option.
        lbs=value        Set logical block size for lbdata option.
        limit=value      The number of bytes to transfer.
        flags=flags      Set open flags:   {excl,sync,...}
        oflags=flags     Set output flags: {append,trunc,...}
        oncerr=action    Set child error action: {abort or continue}.
        parity=string    Set parity to: {even, odd, or none}.
        passes=value     The number of passes to perform.
        pattern=value    The 32 bit hex data pattern to use.
    or  pattern=iot      Use DJ's IOT test pattern.
    or  pattern=incr     Use an incrementing data pattern.
    or  pattern=string   The string to use for the data pattern.
        position=offset  Position to offset before testing.
        procs=value      The number of processes to create.
        ralign=value     The random I/O offset alignment.
        rlimit=value     The random I/O data byte limit.
        rseed=value      The random number generator seed.
        records=value    The number of records to process.
        runtime=time     The number of seconds to execute.
        slices=value     The number of disk slices to test.
        skip=value       The number of records to skip past.
        seek=value       The number of records to seek past.
        step=value       The number of bytes seeked after I/O.
        speed=value      The tty speed (baud rate) to use.
        timeout=value    The tty read timeout in .10 seconds.
        ttymin=value     The tty read minimum count (sets vmin).
        volumes=value    The number of volumes to process.
        vrecords=value   The record limit for the last volume.
        enable=flag      Enable one or more of the flags below.
        disable=flag     Disable one or more of the flags below.

    Flags to enable/disable:
        aio              POSIX Asynchronous I/O.(Default: disabled)
        cerrors          Report close errors.   (Default: enabled)
        compare          Data comparison.       (Default: enabled)
        coredump         Core dump on errors.   (Default: disabled)
        debug            Debug output.          (Default: disabled)
        Debug            Verbose debug output.  (Default: disabled)
        rdebug           Random debug output.   (Default: disabled)
        diag             Log diagnostic msgs.   (Default: disabled)
        dump             Dump data buffer.      (Default: enabled)
        eei              Tape EEI reporting.    (Default: enabled)
        resets           Tape reset handling.   (Default: disabled)
        flush            Flush tty I/O queues.  (Default: enabled)
        fsync            Controls file sync'ing.(Default: runtime)
        header           Log file header.       (Default: enabled)
        lbdata           Logical block data.    (Default: disabled)
        loopback         Loopback mode.         (Default: disabled)
        microdelay       Microsecond delays.    (Default: disabled)
        mmap             Memory mapped I/O.     (Default: disabled)
        modem            Test modem tty lines.  (Default: disabled)
        multi            Multiple volumes.      (Default: disabled)
        pstats           Per pass statistics.   (Default: enabled)
        raw              Read after write.      (Default: disabled)
        stats            Display statistics.    (Default: enabled)
        table            Table(sysinfo) timing. (Default: disabled)
        ttyport          Flag device as a tty.  (Default: disabled)
        unique           Unique pattern.        (Default: enabled)
        verbose          Verbose output.        (Default: enabled)
        verify           Verify data written.   (Default: enabled)

        Example: enable=debug disable=compare,pstats

    Common Open Flags:
        excl (O_EXCL)         Exclusive open. (don't share)
        ndelay (O_NDELAY)     Non-delay open. (don't block)
        nonblock (O_NONBLOCK) Non-blocking open/read/write.
        rsync (O_RSYNC)       Synchronize read operations.
        sync (O_SYNC)         Sync updates for data/file attributes.

    Output Open Flags:
        append (O_APPEND)     Append data to end of existing file.
        defer (O_DEFER)       Defer updates to file during writes.
        dsync (O_DSYNC)       Sync data to disk during write operations.
        trunc (O_TRUNC)       Truncate an exisiting file before writing.

    Delays (Values are seconds, unless microdelay enabled):
        cdelay=value     Delay before closing the file.    (Def: 0)
        edelay=value     Delay between multiple passes.    (Def: 0)
        rdelay=value     Delay before reading each record. (Def: 0)
        sdelay=value     Delay before starting the test.   (Def: 0)
        tdelay=value     Delay before child terminates.    (Def: 1)
        wdelay=value     Delay before writing each record. (Def: 0)

    Numeric Input:
        For options accepting numeric input, the string may contain any
        combination of the following characters:

        Special Characters:
            w = words (4 bytes)            q = quadwords (8 bytes)
            b = blocks (512 bytes)         k = kilobytes (1024 bytes)
            m = megabytes (1048576 bytes)  p = page size (8192 bytes)
            g = gigabytes (1073741824 bytes)
            t = terabytes (1099511627776 bytes)
            inf or INF = infinity (18446744073709551615 bytes)

        Arithmetic Characters:
            + = addition                   - = subtraction
            * or x = multiplcation         / = division
            % = remainder

        Bitwise Characters:
            ~ = complement of value       >> = shift bits right
           << = shift bits left            & = bitwise 'and' operation
            | = bitwise 'or' operation     ^ = bitwise exclusive 'or'

        The default base for numeric input is decimal, but you can override
        this default by specifying 0x or 0X for hexadecimal conversions, or
        a leading zero '0' for octal conversions.  NOTE: Evaluation is from
        right to left without precedence, and parenthesis are not permitted.

    Pattern String Input:
            \\ = Backslash   \a = Alert (bell)   \b = Backspace
            \f = Formfeed    \n = Newline        \r = Carriage Return
            \t = Tab         \v = Vertical Tab   \e or \E = Escape
            \ddd = Octal Value    \xdd or \Xdd = Hexadecimal Value

    Time Input:
            d = days (86400 seconds),      h = hours (3600 seconds)
            m = minutes (60 seconds),      s = seconds (the default)

        Arithmetic characters are permitted, and implicit addition is
        performed on strings of the form '1d5h10m30s'.

    Defaults:
        errors=1, files=0, passes=1, records=0, bs=512, log=stderr
        pattern=0x39c39c39, flow=xon_xoff, parity=none, speed=9600
        timeout=3 seconds, dispose=delete, align=0 (page aligned)
        aios=8, dlimit=64, oncerr=continue, volumes=0, vrecords=1
        iodir=forward, iomode=test, iotype=sequential

    --> Date: February 1st, 2001, Version: 14.1, Author: Robin T. Miller <--
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