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AIX
Why using "%" of Paging size increases & how to decrease this percentage?
Post 302429694 by funksen on Tuesday 15th of June 2010 07:33:23 AM
06-15-2010
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LEARN ABOUT OSX
iopattern
iopattern(1m) USER COMMANDS iopattern(1m) NAME
iopattern - print disk I/O pattern. Uses DTrace. SYNOPSIS
iopattern [-v] [-d device] [-f filename] [-m mount_point] [interval [count]] DESCRIPTION
This prints details on the I/O access pattern for the disks, such as percentage of events that were of a random or sequential nature. By default totals for all disks are printed. An event is considered random when the heads seek. This program prints the percentage of events that are random. The size of the seek is not measured - it's either random or not. Since this uses DTrace, only users with root privileges can run this command. OPTIONS
-v print timestamp, string -d device instance name to snoop (eg, dad0) -f filename full pathname of file to snoop -m mount_point mountpoint for filesystem to snoop EXAMPLES
Default output, print I/O summary every 1 second, # iopattern Print 10 second samples, # iopattern 10 Print 12 x 5 second samples, # iopattern 5 12 Snoop events on the root filesystem only, # iopattern -m / FIELDS
%RAN percentage of events of a random nature %SEQ percentage of events of a sequential nature COUNT number of I/O events MIN minimum I/O event size MAX maximum I/O event size AVG average I/O event size KR total kilobytes read during sample KW total kilobytes written during sample DEVICE device name MOUNT mount point FILE filename (basename) for I/O operation TIME timestamp, string IDEA
Ryan Matteson DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver- bose descriptions explaining the output. EXIT
iopattern will run forever until Ctrl-C is hit, or the specified count is reached. AUTHOR
Brendan Gregg [Sydney, Australia] SEE ALSO
iosnoop(1M), iotop(1M), dtrace(1M) version 0.70 Jul 25, 2005 iopattern(1m)