Stall_Log=file-spec

    Specifies that stall messages are to be written to the specified
    file. This can be useful when you notice a great number of stall
    messages being generated, but do not have the resources on hand
    to immediately investigate and resolve the problem. The file
    generated by the Stall_Log qualifier can be reviewed later so
    that the problem can be traced and resolved.

    The stall messages are written to the file in a format similar to
    the Stall Messages screen. Stall messages are written to the file
    at the same rate as the screen refresh rate. (The refresh rate
    is set with the Time qualifier or from within the Performance
    Monitor with the Set_rate on-screen menu option.) Specifying a
    large refresh rate minimizes the size of the file, but results
    in a large number of missed stall messages. Specifying a small
    refresh rate produces a large log file, but contains more of the
    stall messages generated.

    You do not need to be displaying the Stall Messages screen to
    record the stall messages to the log file. The stall log is
    maintained regardless of which screen, if any, is displayed.

    By default, stall messages are not logged to a file.