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163 lines
3.1 KiB
Bash
Executable File
163 lines
3.1 KiB
Bash
Executable File
#!/usr/bin/sh
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#
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# dnlcstat - DNLC statistics.
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# Written in DTrace (Solaris 10 3/05).
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#
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# The DNLC is the Directory Name Lookup Cache. Filename lookups often
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# return a hit from here, before needing to traverse the regular file
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# system cache or go to disk.
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#
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# $Id: dnlcstat 3 2007-08-01 10:50:08Z brendan $
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#
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# USAGE: dnlcstat [interval [count]]
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#
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# FIELDS:
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#
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# %hit hit percentage for this sample
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# hit number of DNLC hits in this sample
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# miss number of DNLC misses in this sample
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#
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# SEE ALSO: CacheKit, http://www.brendangregg.com/cachekit.html
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# (contains a dnlcstat written in Perl, which uses less CPU)
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#
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# COPYRIGHT: Copyright (c) 2005 Brendan Gregg.
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#
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# CDDL HEADER START
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#
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# The contents of this file are subject to the terms of the
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# Common Development and Distribution License, Version 1.0 only
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# (the "License"). You may not use this file except in compliance
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# with the License.
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#
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# You can obtain a copy of the license at Docs/cddl1.txt
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# or http://www.opensolaris.org/os/licensing.
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# See the License for the specific language governing permissions
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# and limitations under the License.
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#
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# CDDL HEADER END
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#
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# 27-Mar-2004 Brendan Gregg Created this.
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# 14-Jun-2005 " " Updated style.
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# 14-Jun-2005 " " Last update.
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#
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##############################
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# --- Process Arguments ---
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#
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### default values
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interval=1; count=-1
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### check arguments
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if [ "$1" = "-h" -o "$1" = "--help" ]; then
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cat <<-END >&2
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USAGE: dnlcstat [interval [count]]
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dnlcstat # 1 second samples, infinite
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eg,
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dnlcstat 1 # print every 1 second
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dnlcstat 5 6 # print every 5 seconds, 6 times
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END
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exit 1
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fi
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### argument logic
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if [ "$1" -gt 0 ]; then
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interval=$1; count=-1; shift
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fi
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if [ "$1" -gt 0 ]; then
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count=$1; shift
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fi
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if [ $interval -eq 0 ]; then
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interval=1
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fi
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#################################
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# --- Main Program, DTrace ---
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#
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/usr/sbin/dtrace -n '
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#pragma D option quiet
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/*
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* Command line arguments
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*/
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inline int INTERVAL = '$interval';
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inline int COUNTER = '$count';
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inline int SCREEN = 21;
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int hits; /* hits */
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int misses; /* misses */
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/*
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* Initialise variables
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*/
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dtrace:::BEGIN
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{
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lines = SCREEN + 1;
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counts = COUNTER;
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secs = INTERVAL;
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first = 1;
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}
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/*
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* Print header
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*/
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dtrace:::BEGIN,
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tick-1sec
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/first || (secs == 0 && lines > SCREEN)/
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{
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printf("%10s %8s %8s\n","dnlc %hit","hit","miss");
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lines = 0;
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first = 0;
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}
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/*
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* Probe DNLC lookups
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*/
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fbt:genunix:dnlc_lookup:return
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{
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hits += arg1 == 0 ? 0 : 1;
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misses += arg1 == 0 ? 1 : 0;
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}
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profile:::tick-1sec
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{
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secs--;
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}
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/*
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* Print output line
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*/
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profile:::tick-1sec
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/secs == 0/
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{
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/* calculate hit percent */
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this->divide = misses + hits == 0 ? 1 : misses + hits;
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ratio = hits * 100 / this->divide;
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/* print output */
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printf("%10d %8d %8d\n",ratio,hits,misses);
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/* clear counters */
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hits = 0;
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misses = 0;
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/* process counts */
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secs = INTERVAL;
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counts--;
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lines++;
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}
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/*
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* End
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*/
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profile:::tick-1sec
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/counts == 0/
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{
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exit(0);
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}
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'
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