114 lines
2.5 KiB
Bash
Executable File
114 lines
2.5 KiB
Bash
Executable File
#!/usr/bin/ksh
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#
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# diskhits - disk access by file offset.
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# Written using DTrace (Solaris 10 3/05).
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#
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# $Id: diskhits 3 2007-08-01 10:50:08Z brendan $
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#
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# This prints how a file was accessed, the locations on a distribution plot.
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# This is for the cache misses only - the file activity that resulted in
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# disk events.
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#
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# USAGE: diskhits pathname
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# eg,
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# diskhits /var/adm/messages
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#
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# FIELDS:
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# Location (KB) The file offset of the disk activity, Kbytes.
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# Size (KB) Size of the disk activity, Kbytes.
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# Total RW Total disk activity, reads + writes.
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#
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# BASED ON: /usr/demo/dtrace/applicat.d
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#
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# SEE ALSO: DTrace Guide "io Provider" chapter (docs.sun.com)
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# iosnoop (DTraceToolkit)
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#
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# PORTIONS: Copyright (c) 2005, 2006 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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# 08-Jun-2005 Brendan Gregg Created this.
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# 20-Apr-2006 " " Last update.
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#
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### Usage
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function usage
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{
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cat <<-END >&2
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USAGE: diskhits pathname
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eg,
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diskhits /var/adm/wtmpx
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END
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exit 1
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}
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### Process arguments
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if (( $# != 1 )); then
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usage
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fi
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if [[ $1 == "-h" ]]; then
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usage
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fi
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pathname=$1
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if [[ ! -e $pathname ]]; then
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print "ERROR2: file $pathname not found" >&2
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exit 2
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fi
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### Calculate output scale
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report_lines=20
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set -- `ls -l $pathname`
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filesize=$5
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(( file_kb_max = filesize / 1024 ))
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(( scale_kb = filesize / (1024 * report_lines) ))
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if (( file_kb_max < 20 )); then file_kb_max=20; fi
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if (( scale_kb < 1 )); then scale_kb=1; fi
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#
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# Run DTrace
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#
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/usr/sbin/dtrace -n '
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#pragma D option quiet
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inline string PATHNAME = "'$pathname'";
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inline int FILE_KB_MAX = '$file_kb_max';
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inline int SCALE_KB = '$scale_kb';
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dtrace:::BEGIN
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{
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printf("Tracing... Hit Ctrl-C to end.\n");
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}
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io:::start
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/args[2]->fi_pathname == PATHNAME/
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{
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this->kb = args[2]->fi_offset == -1 ? -1 : args[2]->fi_offset / 1024;
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@Location = lquantize(this->kb, 0, FILE_KB_MAX, SCALE_KB);
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@Size = quantize(args[0]->b_bcount/1024);
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@Total = sum(args[0]->b_bcount/1024);
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}
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dtrace:::END
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{
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printf("Location (KB),");
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printa(@Location);
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printf("Size (KB),");
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printa(@Size);
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printa("Total RW: %@d KB\n", @Total);
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}
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'
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