1#!/usr/sbin/dtrace -s
2/*
3 * nfswizard.d - nfs client activity wizard.
4 *               Written using DTrace (Solaris 10 3/05).
5 *
6 * This examines activity caused by NFS client processes on the same server
7 * that you are running this script on. A detailed report is generated
8 * to explain various details of NFS client activity, including response
9 * times and file access.
10 *
11 * $Id: nfswizard.d 3 2007-08-01 10:50:08Z brendan $
12 *
13 * USAGE:     nfswizard.d    # hit Ctrl-C to end sample
14 *
15 * COPYRIGHT: Copyright (c) 2005, 2006 Brendan Gregg.
16 *
17 * CDDL HEADER START
18 *
19 *  The contents of this file are subject to the terms of the
20 *  Common Development and Distribution License, Version 1.0 only
21 *  (the "License").  You may not use this file except in compliance
22 *  with the License.
23 *
24 *  You can obtain a copy of the license at Docs/cddl1.txt
25 *  or http://www.opensolaris.org/os/licensing.
26 *  See the License for the specific language governing permissions
27 *  and limitations under the License.
28 *
29 * CDDL HEADER END
30 *
31 * 02-Dec-2005  Brendan Gregg   Created this.
32 * 20-Apr-2006	   "	  "	Last update.
33 */
34
35#pragma D option quiet
36
37dtrace:::BEGIN
38{
39	printf("Tracing... Hit Ctrl-C to end.\n");
40	scriptstart = walltimestamp;
41	timestart = timestamp;
42}
43
44io:nfs::start
45{
46	/* tally file sizes */
47	@file[args[2]->fi_pathname] = sum(args[0]->b_bcount);
48
49	/* time response */
50	start[args[0]->b_addr] = timestamp;
51
52	/* overall stats */
53	@rbytes = sum(args[0]->b_flags & B_READ ? args[0]->b_bcount : 0);
54	@wbytes = sum(args[0]->b_flags & B_READ ? 0 : args[0]->b_bcount);
55	@events = count();
56}
57
58io:nfs::done
59/start[args[0]->b_addr]/
60{
61	/* calculate and save response time stats */
62	this->elapsed = timestamp - start[args[0]->b_addr];
63	@maxtime = max(this->elapsed);
64	@avgtime = avg(this->elapsed);
65	@qnztime = quantize(this->elapsed / 1000);
66}
67
68dtrace:::END
69{
70	/* print header */
71	printf("NFS Client Wizard. %Y -> %Y\n\n", scriptstart, walltimestamp);
72
73	/* print read/write stats */
74	printa("Read:  %@d bytes ", @rbytes);
75	normalize(@rbytes, 1000000);
76	printa("(%@d Mb)\n", @rbytes);
77	printa("Write: %@d bytes ", @wbytes);
78	normalize(@wbytes, 1000000);
79	printa("(%@d Mb)\n\n", @wbytes);
80
81	/* print throughput stats */
82	denormalize(@rbytes);
83	normalize(@rbytes, (timestamp - timestart) / 1000000);
84	printa("Read:  %@d Kb/sec\n", @rbytes);
85	denormalize(@wbytes);
86	normalize(@wbytes, (timestamp - timestart) / 1000000);
87	printa("Write: %@d Kb/sec\n\n", @wbytes);
88
89	/* print time stats */
90	printa("NFS I/O events:    %@d\n", @events);
91	normalize(@avgtime, 1000000);
92	printa("Avg response time: %@d ms\n", @avgtime);
93	normalize(@maxtime, 1000000);
94	printa("Max response time: %@d ms\n\n", @maxtime);
95	printa("Response times (us):%@d\n", @qnztime);
96
97	/* print file stats */
98	printf("Top 25 files accessed (bytes):\n");
99	printf("   %-64s %s\n", "PATHNAME", "BYTES");
100	trunc(@file, 25);
101	printa("   %-64s %@d\n", @file);
102}
103