1#!/usr/sbin/dtrace -s
2/*
3 * rfileio.d - read file I/O stats, with cache miss rate.
4 *             Written using DTrace (Solaris 10 3/05)
5 *
6 * This script provides statistics on the number of reads and the bytes
7 * read from filesystems (logical), and the number of bytes read from
8 * disk (physical). A summary is printed every five seconds by file.
9 *
10 * A total miss-rate is also provided for the file system cache.
11 *
12 * $Id: rfileio.d 3 2007-08-01 10:50:08Z brendan $
13 *
14 * USAGE:	rfileio.d
15 *
16 * IDEA: Richard McDougall, Solaris Internals 2nd Ed, FS Chapter.
17 *
18 * COPYRIGHT: Copyright (c) 2006 Brendan Gregg.
19 *
20 * CDDL HEADER START
21 *
22 *  The contents of this file are subject to the terms of the
23 *  Common Development and Distribution License, Version 1.0 only
24 *  (the "License").  You may not use this file except in compliance
25 *  with the License.
26 *
27 *  You can obtain a copy of the license at Docs/cddl1.txt
28 *  or http://www.opensolaris.org/os/licensing.
29 *  See the License for the specific language governing permissions
30 *  and limitations under the License.
31 *
32 * CDDL HEADER END
33 *
34 * 19-Mar-2006  Brendan Gregg   Created this.
35 * 23-Apr-2006	   "      "	Last update.
36 */
37
38#pragma D option quiet
39
40self int trace;
41uint64_t lbytes;
42uint64_t pbytes;
43
44dtrace:::BEGIN
45{
46	trace("Tracing...\n");
47}
48
49fbt::fop_read:entry
50/self->trace == 0 && args[0]->v_path/
51{
52	self->pathname = cleanpath(args[0]->v_path);
53	@rio[self->pathname, "logical"] = count();
54	lbytes += args[1]->uio_resid;
55	self->size = args[1]->uio_resid;
56	self->uiop = args[1];
57}
58
59fbt::fop_read:return
60/self->size/
61{
62	@rbytes[self->pathname, "logical"] =
63	    sum(self->size - self->uiop->uio_resid);
64	self->size = 0;
65	self->uiop = 0;
66	self->pathname = 0;
67}
68
69io::bdev_strategy:start
70/self->size && args[0]->b_flags & B_READ/
71{
72	@rio[self->pathname, "physical"] = count();
73	@rbytes[self->pathname, "physical"] = sum(args[0]->b_bcount);
74	pbytes += args[0]->b_bcount;
75}
76
77profile:::tick-5s
78{
79	trunc(@rio, 20);
80	trunc(@rbytes, 20);
81	printf("\033[H\033[2J");
82	printf("\nRead IOPS, top 20 (count)\n");
83	printa("%-54s %10s %10@d\n", @rio);
84	printf("\nRead Bandwidth, top 20 (bytes)\n");
85	printa("%-54s %10s %10@d\n", @rbytes);
86	printf("\nTotal File System miss-rate: %d%%\n",
87	    lbytes ? 100 * pbytes / lbytes : 0);
88	trunc(@rbytes);
89	trunc(@rio);
90	lbytes = pbytes = 0;
91}
92