Command to fresh the memory ! Post: 302370826

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Operating Systems AIX Command to fresh the memory ! Post 302370826 by zxmaus on Thursday 12th of November 2009 01:42:13 PM

11-12-2009

Moderator

I came today across an undocumented command that might do what you want if you have bos.perf.tools installed - but I would be very careful doing this EVER on a production system: /usr/lib/perf/crush

It basically tells the VMM's page stealer to switch to an "aggressive" mode that may end up freeing pages that applications have not touched in a while.

usage:

Code:

/usr/lib/perf/crush <integer>

you calculate the integer using output from 'svmon -G' : memory size total - memory pinned = <integer>

Rumor has it that it was developed for internal IBM use to clean memory pages before running benchmark applications.

Your applications might slow down for a moment but you will see a much bigger free list afterwards.

Kind regards
zxmaus

zxmaus

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perf-inject

PERF-INJECT(1)							    perf Manual 						    PERF-INJECT(1)

NAME

       perf-inject - Filter to augment the events stream with additional information

SYNOPSIS

       perf inject <options>

DESCRIPTION

       perf-inject reads a perf-record event stream and repipes it to stdout. At any point the processing code can inject other events into the
       event stream - in this case build-ids (-b option) are read and injected as needed into the event stream.

       Build-ids are just the first user of perf-inject - potentially anything that needs userspace processing to augment the events stream with
       additional information could make use of this facility.

OPTIONS

       -b, --build-ids=
	   Inject build-ids into the output stream

       -v, --verbose
	   Be more verbose.

       -i, --input=
	   Input file name. (default: stdin)

       -o, --output=
	   Output file name. (default: stdout)

       -s, --sched-stat
	   Merge sched_stat and sched_switch for getting events where and how long tasks slept. sched_switch contains a callchain where a task
	   slept and sched_stat contains a timeslice how long a task slept.

SEE ALSO

       perf-record(1), perf-report(1), perf-archive(1)

perf								    06/30/2014							    PERF-INJECT(1)