86 lines
2.1 KiB
D
Executable File
86 lines
2.1 KiB
D
Executable File
#!/usr/sbin/dtrace -s
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/*
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* seeksize.d - analyse disk head seek distance by process.
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* Written using DTrace (Solaris 10 3/05).
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*
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* Disk I/O events caused by processes will in turn cause the disk heads
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* to seek. This program analyses those seeks, so that we can determine
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* if processes are causing the disks to seek in a "random" or "sequential"
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* manner.
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*
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* $Id: seeksize.d,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $
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*
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* USAGE: seeksize.d # wait several seconds, then hit Ctrl-C
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*
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* FIELDS:
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* PID process ID
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* CMD command and argument list
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* value distance in disk blocks (sectors)
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* count number of I/O operations
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*
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* SEE ALSO: bitesize.d, iosnoop
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*
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* COPYRIGHT: Copyright (c) 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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* 11-Sep-2004 Brendan Gregg Created this.
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* 10-Oct-2004 " " Rewrote to use the io provider.
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* 20-Apr-2006 " " Last update.
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*/
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#pragma D option quiet
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/*
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* Print header
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*/
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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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self int last[dev_t];
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/*
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* Process io start
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*/
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io:genunix::start
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/self->last[args[0]->b_edev] != 0/
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{
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/* calculate seek distance */
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this->last = self->last[args[0]->b_edev];
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this->dist = (int)(args[0]->b_blkno - this->last) > 0 ?
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args[0]->b_blkno - this->last : this->last - args[0]->b_blkno;
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/* store details */
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@Size[pid, curpsinfo->pr_psargs] = quantize(this->dist);
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}
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io:genunix::start
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{
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/* save last position of disk head */
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self->last[args[0]->b_edev] = args[0]->b_blkno +
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args[0]->b_bcount / 512;
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}
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/*
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* Print final report
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*/
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dtrace:::END
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{
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printf("\n%8s %s\n", "PID", "CMD");
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printa("%8d %S\n%@d\n", @Size);
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}
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