cmx man page on Ultrix

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cmx(8)									cmx(8)

       cmx - generic communication exerciser

       /usr/field/cmx [ -h ] [ -ofile ] [ -tn ] -l line-1 ...

       The  exerciser  will  write,  read, and validate random data and packet
       lengths on a given communications line.	The line under test must  have
       a  loopback  connector  attached to the distribution panel or the cable
       and the line must be disabled in the file and a non-modem  line.	  That
       is, the flag must be set to off.

       The exerciser runs until or kill -15 pid is sent to the process.

       A  logfile is made in for you to examine and then remove.  If there are
       errors listed in the logfile,  make  sure  that	you  check  the	 file,
       because that is where the driver and kernel error messages are saved.

       You must specify the -l flag followed by the lines to test.  The line-n
       arguments identify the lines to be tested.  A maximum of 32  lines  can
       be tested at any one time.  The line-n arguments are specified as names
       taken from the directory without the letters ``tty''.  For example,  if
       the directory lists tty03, the line argument is 03.

       The DEVICES section lists the devices that can be tested.

       If  there  is a need to run a system exerciser over an NFS link or on a
       diskless system there are some restrictions.  For exercisers that  need
       to  write  into	a  file system, such as the target file system must be
       writable by root.  Also the directory, in which any of  the  exercisers
       are  executed,  must  be	 writable  by root because temporary files are
       written into the current	 directory.   These  latter  restrictions  are
       sometimes  difficult  to	 overcome  because  often NFS file systems are
       mounted in a way that prevents root from writing into  them.   Some  of
       the  restrictions  may  be overcome by copying the exerciser to another
       directory and then executing it.

       -h     Prints help message about this command.

       -ofile Save output diagnostics in file.

       -tn    Run time in minutes (n).	The default is to run until a or  kill
	      -15 pid is sent to the process.

       Pseudo devices (those whose first character after tty is p, q, r, s, t,
       u) cannot be tested.  Neither can lta devices with major #39.

       Use the command on to find out which tty line corresponds to  a	device
       line number.

       The  following  example	runs the exerciser for 60 minutes on lines 00,
       13, 22, and 32.
       % /usr/field/cmx -t60 -l 00 13 22 32
       The following example runs the exerciser on lines 11, 42, 45, and 76 in
       the background until interrupted by a or kill -15 pid.
       % /usr/field/cmx -l 11 42 45 76 &

See Also
       Guide to System Exercisers


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