iostat man page on BSDOS

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IOSTAT(8)		  BSD System Manager's Manual		     IOSTAT(8)

NAME
     iostat - report I/O statistics

SYNOPSIS
     iostat [-c count] [-M core] [-N system] [-w wait] [drives]

DESCRIPTION
     Iostat displays kernel I/O statistics on terminal, disk and cpu opera-
     tions.

     The options are as follows:

     -c	   Repeat the display count times.  The first display is for the time
	   since a reboot and each subsequent report is for the time period
	   since the last display.  If no wait interval is specified, the de-
	   fault is 1 second.

     -M	   Extract values associated with the name list from the specified
	   core instead of the default ``/dev/kmem''.

     -N	   Extract the name list from the specified system instead of the de-
	   fault ``/bsd''.

     -w	   Pause wait seconds between each display.  If no repeat count is
	   specified, the default is infinity.

     Iostat displays its information in the following format:

     tty
	   tin	   characters read from terminals
	   tout	   characters written to terminals

     disks
	   Disk operations (this field is system dependent).  The header of
	   the field is the disk name and unit number.	Iostat displays as
	   many drives as can fit on the screen, or all drives on the system
	   when stdout is not directed to a tty.  To force iostat to display
	   specific drives, their names may be supplied on the command line.

	   sps	   sectors transferred per second
	   tps	   transfers per second
	   msps	   milliseconds per average seek (including implied seeks and
		   rotational latency)

     cpu
	   usr	   % of cpu time in user mode
	   nic	   % of cpu time in user mode running niced processes
	   sys	   % of cpu time in system mode
	   int	   % of cpu time handling interrupts
	   idl	   % of cpu time in idle mode

ENVIRONMENT
     The following environment variables affect the execution of iostat:

     COLUMNS	If this variable contains a string representing a decimal in-
		teger, it is used as the column position width for displaying
		multiple-text-column output.  The iostat utility calculates
		how many disk drives may be displayed based on the width pro-
		vided.

FILES

     /bsd	Default kernel namelist.
     /dev/kmem	Default memory file.

SEE ALSO
     fstat(1),	netstat(1),  nfsstat(1),  ps(1),  systat(1),  pstat(8),	 vm-
     stat(8)

     The sections starting with ``Interpreting system activity'' in Installing
     and Operating 4.3BSD.

4th Berkeley Distribution	 June 6, 1993				     2
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