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libstatgrab 0.16 (Default branch)
03-18-2008
The libstatgrab library provides an easy-to-useinterface for accessing system statistics andinformation. Available statistics include CPU,Load, Memory, Swap, Disk I/O, and Network I/O. Itwas developed to work on Linux, FreeBSD, andSolaris. The package also includes two tools:saidar provides a curses-based interface forviewing live system statistics, and statgrab is asysctl-like interface to the statistics.License: GNU Lesser General Public License (LGPL)Changes:|
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CTLSTAT(8) BSD System Manager's Manual CTLSTAT(8) NAME
ctlstat -- CAM Target Layer statistics utility SYNOPSIS
ctlstat [-t] [-c count] [-C] [-d] [-D] [-j] [-l lun] [-n numdevs] [-w wait] DESCRIPTION
The ctlstat utility provides statistics information for the CAM Target Layer. The first display (except for dump and JSON modes) shows aver- age statistics since system startup. Subsequent displays show average statistics during the measurement interval. The options are as follows: -t Total mode. This displays separate columns with the total CTL read and write output, and a combined total column that also includes non I/O operations. -c count Display statistics this many times. -C Disable display of CPU statistics. -d Display DMA operation time (latency) instead of overall I/O time (latency). -D Text dump mode. Dump all available statistics every 30 seconds in a text format suitable for parsing. No statistics are com- puted in this mode, only raw numbers are displayed. -h Suppress display of the header. -j JSON dump mode. Dump all available statistics every 30 seconds in JavaScript Object Notation (JSON) format. No statistics are computed in this mode, only raw numbers are displayed. -l lun Request statistics for the specified LUN. This option is incompatible with total (-t) mode. -n numdevs Display statistics for this many devices. -w wait Wait this many seconds in between displays. If this option is not specified, ctlstat defaults to a 1 second interval. EXAMPLES
ctlstat -t Display total statistics for the system with a one second interval. ctlstat -d -l 5 -C Display average DMA time for LUN 5 and omit CPU utilization. ctlstat -n 7 -w 10 Display statistics for the first 7 LUNs, and display average statistics every 10 seconds. SEE ALSO
cam(3), cam(4), ctl(4), xpt(4), camcontrol(8), ctladm(8), iostat(8) AUTHORS
Ken Merry <ken@FreeBSD.org> Will Andrews <will@FreeBSD.org> BSD
March 6, 2013 BSD