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Homework and Emergencies Emergency UNIX and Linux Support Performance investigation, very high runq-sz %runocc Post 302511654 by jlliagre on Thursday 7th of April 2011 09:34:19 AM
Old 04-07-2011
The system load is far too high compared to the user load.

You should investigate what processes and what system calls are consuming that much kernel time.

Start with running
Code:
prstat -mZ -n 30 -c 10 2

during a peak period.
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topsysproc(1m)							   USER COMMANDS						    topsysproc(1m)

NAME
topsysproc - top syscalls by process name. Uses DTrace. SYNOPSIS
topsysproc [-Cs] [interval [count]] DESCRIPTION
This program continually prints a report of the number of system calls by process name, and refreshes the display every 1 second or as specified at the command line. Similar data can be fetched with "prstat -m". Since this uses DTrace, only users with root privileges can run this command. OPTIONS
-C don't clear the screen -s print per second values EXAMPLES
Default output, 1 second updates, # topsysproc Print every 5 seconds, # topsysproc 5 Print a scrolling output, # topsysproc -C FIELDS
load avg load averages, see uptime(1) syscalls total syscalls in this interval syscalls/s syscalls per second PROCESS process name COUNT total syscalls in this interval COUNT/s syscalls per second NOTES
There may be several PIDs with the same process name. 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
topsysproc will run until Ctrl-C is hit. AUTHOR
Brendan Gregg [Sydney, Australia] SEE ALSO
dtrace(1M), prstat(1M) version 0.90 Jun 13, 2005 topsysproc(1m)
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