1#!/usr/sbin/dtrace -s
2/*
3 * bitesize.d - analyse disk I/O size by process.
4 *              Written using DTrace (Solaris 10 3/05).
5 *
6 * This produces a report for the size of disk events caused by
7 * processes. These are the disk events sent by the block I/O driver.
8 *
9 * If applications must use the disks, we generally prefer they do so
10 * with large I/O sizes.
11 *
12 * 18-Feb-2006, ver 1.11
13 *
14 * USAGE:	bitesize.d	# wait several seconds, then hit Ctrl-C
15 *
16 * FIELDS:
17 *		PID		process ID
18 *		CMD		command and argument list
19 *		value		size in bytes
20 *		count		number of I/O operations
21 *
22 * NOTES:
23 *
24 * The application may be requesting smaller sized operations, which
25 * are being rounded up to the nearest sector size or UFS block size.
26 * To analyse what the application is requesting, DTraceToolkit programs
27 * such as Proc/fddist may help.
28 *
29 * SEE ALSO: seeksize.d, iosnoop
30 *
31 * COPYRIGHT: Copyright (c) 2006 Brendan Gregg.
32 *
33 * CDDL HEADER START
34 *
35 *  The contents of this file are subject to the terms of the
36 *  Common Development and Distribution License, Version 1.0 only
37 *  (the "License").  You may not use this file except in compliance
38 *  with the License.
39 *
40 *  You can obtain a copy of the license at Docs/cddl1.txt
41 *  or http://www.opensolaris.org/os/licensing.
42 *  See the License for the specific language governing permissions
43 *  and limitations under the License.
44 *
45 * CDDL HEADER END
46 *
47 * 31-Mar-2004	Brendan Gregg	Created this, build 51.
48 * 10-Oct-2004	   "      "	Rewrote to use the io provider, build 63.
49 */
50
51#pragma D option quiet
52
53/*
54 * Print header
55 */
56dtrace:::BEGIN
57{
58	printf("Tracing... Hit Ctrl-C to end.\n");
59}
60
61/*
62 * Process io start
63 */
64io:::start
65{
66	/* fetch details */
67	this->size = args[0]->b_bcount;
68
69	/* store details */
70	@Size[pid, curpsinfo->pr_psargs] = quantize(this->size);
71}
72
73/*
74 * Print final report
75 */
76dtrace:::END
77{
78	printf("\n%8s  %s\n", "PID", "CMD");
79	printa("%8d  %S\n%@d\n", @Size);
80}
81
82