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osview(1)							     osview(1)

NAME    [Toc]    [Back]

     osview - monitor operating	system activity	data

SYNOPSIS    [Toc]    [Back]

     osview [-in] [-nn]	[-s] [-a] [-c]

DESCRIPTION    [Toc]    [Back]

     osview monitors various portions of the activity of the operating system
     and displays them using the full screen capabilities of the current

     A large number of activity	counters are monitored,	and the	display	may be
     dynamically altered to hide or show only those counters in	which the user
     is	interested.  The default is no longer to display all the statistics
     initially,	instead	there is a selection menu at the bottom	of the
     display; enter the	number of the selection	to switch displays.  See the
     -a	option for the older behavior.	It is assumed that the osview user is
     somewhat familiar with the	internal workings of an	AT&T V.4 based kernel.

     osview lays out as	much information as possible in	the screen area
     available.	 Each data item	is grouped similarly to	the grouping shown by
     sar(1).  A	header line gives the group name, and members of the group are
     indented below along with the one-second average value over the last
     interval (or total	value over the interval; see below).  If a graphics
     subsystem is not present on the machine being monitored, osview
     suppresses	all graphics related statistics	in the display.

     The -i parameter sets the delay between screen updates in seconds.	 By
     default, a	5 second rate is used.	The -n parameter is used to override
     the default number	of lines to use, which is usually the entire size of
     the display area.	This can be useful if the display is called up in a
     long window, to keep the counters grouped together	at the top of the
     window.  The -s option informs osview to not reduce relevant values to
     the average over a	second.	 One second averaging allows instant
     performance estimates, but	may show inaccuracies because of the short
     interval involved.	 The -a	option gives behavior like the older versions,
     with all possible statistics displayed at once (the same as the 0 option
     on	the selection line, if this option isn't given.	 The -c	option causes
     a running count to	be displayed, rather than an interval count.  The
     counts can	be reset to zero by pressing the C key.

     In	general, those parameters dealing with data throughput rather than
     events are	presented as the number	of bytes involved.  For	instance,
     memory usage is reported in bytes,	as well	as buffer cache	traffic.
     Those parameters dealing with events to the system, such as page fault
     activity, interrupts or system activity are reported as actual counts.
     This allows an instant estimate of	the activity and throughput of the

     A group can be suppressed along with all its members to allow hidden
     groups to be brought into view if the screen area is too small.  This is
     done by moving the	cursor over the	header line of the group to suppress

									Page 1

osview(1)							     osview(1)

     and typing	a suppression character.  The cursor may be positioned in any
     of	the standard ways; keyboard arrow keys,	the h-j-k-l keys, or the
     backspace-return-tab keys.	 osview	highlights the line the	cursor is on
     unless the	cursor is on the top screen line (which	is reserved for	status
     information).  When positioned over a group name, typing the D character
     or	one of the delete keys on the keyboard will suppress the group.	 The
     group name	will remain, with an asterisk (*) prefix to indicate that the
     group has been suppressed.	 The group may be expanded again by
     positioning the cursor over the group name	and typing the I character or
     one of the	insert keys on the keyboard.  The home key moves the cursor to
     the osview	status line.

OVERVIEW    [Toc]    [Back]

     The information which osview displays and how to interpret	it is given
     below.  See the documentation for sar(1) or gr_osview(1) for additional
     information.  Some	headers, including Swap, and Interrupts	are suppressed
     by	default.  See above description	of how to get them to display.	Some
     headers, including	PathName Cache,	EfsAct,	and Getblk contain information
     that is subject to	change and is of use primarily by IRIX development
     groups.  Tiles information	is only	displayed if the kernel	supports that

     Load Average
	These counters give load average over the last minute, 5 minutes and
	15 minutes.

     CPU Usage
	These counters display the proportion of the available processor
	cycles which were used by each of the following	activities.  If
	multiple processors are	present, then the CPU number will be added to
	the header line.

	user	  - user programs
	sys	  - system on behalf of	user
	intr	  - interrupt handling
	gfxc	  - graphics context switching
	gfxf	  - waiting on graphics	input FIFO
	sxbrk	  - waiting for	memory
	idle	  - doing nothing

     Wait Ratio
	These counters display the proportion of time no processes were
	available to run, and any processes were waiting for I/O to complete.

	%IO	  - waiting on IO
	%Swap	  - waiting on swap IO
	%Physio	  - waiting on physical	IO

     System Memory

	Phys	  - physical memory size
	 kernel	  - memory consumed by kernel text and data

									Page 2

osview(1)							     osview(1)

	  heap	  - part of kernel used	by heap
	   stream - part of heap used by streams
	  zone	  - part of kernel used	by zone	allocator
	  ptbl	  - part of kernel used	by process page	tables
	 fs ctl	  - memory holding filesystem meta-data
	 fs data  - memory holding filesystem file data
	  delwri  - modified filesystem	file data
	 free	  - memory not in use
	 userdata - in use holding valid user data
	 pgalloc  - physical pages allocated from free pool

     System Activity

	syscall	  - system calls
	 read	  - read system	calls
	 write	  - write system calls
	 fork	  - fork system	calls
	 exec	  - exec system	calls
	readch	  - characters read via	read()
	writech	  - characters written via write()
	iget	  - efs	inode searches

     Block Devices

	lread	  - amount of logical buffer reads
	bread	  - amount of physical buffer reads
	%rcache	  - read hit ratio on buffer cache
	lwrite	  - amount of logical buffer writes
	bwrite	  - amount of physical buffer writes
	wcancel	  - amount of delayed writes cancelled
	%wcache	  - write hit ratio; negative for write-behind
	phread	  - amount of raw physical reads
	phwrite	  - amount of raw physical writes


	freeswap  - amount of free physical swap
	vswap	  - amount of free virtual swap
	swapin	  - page swapins
	swapout	  - page swapouts
	bswapin	  - bytes swapped in
	bswapout  - bytes swapped out

     System VM

	Dynamic	VM     - total dynamic system VM
	 avail	  - system VM available
	 in use	  - system VM in use
	  fs data - in use by FS buffer	cache
	 allocs	  - pages of system VM allocated
	 frees	  - pages of system VM freed

									Page 3

osview(1)							     osview(1)

     Memory Faults

	vfault	  - page faults
	pfault	  - protection faults
	demand	  - demand zero	and demand fill	faults
	cw	  - copy-on write faults
	steal	  - page steals
	onswap	  - page found on swap
	oncache	  - page found in page cache
	onfile	  - page read from file
	freed	  - pages freed	by paging daemon
	unmodswap - clean swap page, dirty incore page
	unmodfile - clean file page, dirty incore page
	iclean	  - number of icache cleans

     TLB Actions

	newpid	  - new	process	ID allocated
	tfault	  - second level TLB misses
	rfault	  - reference faults (during paging)
	flush	  - flush of entire TLB
	sync	  - cross-processor TLB	synchronizations


	griioctl  - graphics ioctl's
	gintr	  - graphics interrupts
	swapbuf	  - swapbuffer completes
	switch	  - context switches
	fifowait  - wait on FIFO
	fifonwait - wait on FIFO, below	low-water mark on check


	tavail	  - tiles available, no	locked pages
	 avfree	  - free pages in available tiles
	tfrag	  - tiles fragmented with locked pages
	 fraglock - locked pages within	tfrags
	 fragfree - free pages within tfrags
	tfull	  - tiles full,	all pages locked
	 ttile	  - tiles allocated
	pglocks	  - tile page locks
	tallocmv  - pages relocated for	tile_alloc
	tiledmv	  - pages relocated by tiled daemon


	conns	  - connections	accepted
	sndtotal  - packets sent
	rcvtotal  - packets received
	sndbyte	  - bytes sent
	rcvbyte	  - bytes received

									Page 4

osview(1)							     osview(1)


	ipackets  - packets received
	opackets  - packets sent
	dropped	  - packets dropped
	errors	  - input errors


	ipackets  - packets received
	opackets  - packets sent
	forward	  - packets forwarded
	dropped	  - output errors
	errors	  - input errors

	These counters display the activity on a particular network interface.
	If multiple interfaces are present, than a separate set	of counters is
	displayed for each interface.  The interface name is displayed as part
	of the header.

	Ipackets  - packets received
	Opackets  - packets transmitted
	Ierrors	  - packets received in	error
	Oerrors	  - errors transmitting	a packet
	collisions- collisions detected


	runq	  - number of processes	on run queue
	swapq	  - number of processes	on swap	queue
	switch	  - context switches


	all	  - total interrupts handled
	vme	  - VMEBus interrupts

SEE ALSO    [Toc]    [Back]

     gr_osview(1), top(1), sar(1).

BUGS    [Toc]    [Back]

     osview cannot atomically get all the data it needs.  On a very busy
     system, some percentages could sum	to greater than	100, since there could
     be	a gap between the time osview reads the	current	time and when it reads
     the data counters.

									PPPPaaaaggggeeee 5555
[ Back ]
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