1#!/usr/sbin/dtrace -Zs
2/*
3 * j_stat.d - Java operation stats using DTrace.
4 *            Written for the Java hotspot DTrace provider.
5 *
6 * $Id: j_stat.d 64 2007-10-04 08:35:29Z claire $
7 *
8 * This traces activity from all Java processes on the system with hotspot
9 * provider support (1.6.0). Method calls and object allocation are only
10 * visible when using the flag "+ExtendedDTraceProbes". eg,
11 * java -XX:+ExtendedDTraceProbes classfile
12 *
13 * USAGE: j_stat.d [interval [count]]
14 *
15 * FIELDS:
16 *		EXEC/s		Java programs executed per second, including
17 *				those without Java provider support
18 *		THREAD/s	Threads created, per second
19 *		METHOD/s	Methods called, per second
20 *		OBJNEW/s	Objects created, per second
21 *		CLOAD/s		Class loads, per second
22 *		EXCP/s		Exceptions raised, per second
23 *		GC/s		Garbage collects, per second
24 *
25 * The numbers are per second counts for the interval specified. The default
26 * interval is 1 second.
27 *
28 * If you see a count in "EXECS" but not in the other columns, then your
29 * Java software is probably not running with the DTrace hotspot provider.
30 *
31 * If you see counts in "CLOAD" but not in "METHODS", then you Java
32 * software probably isn't running with "+ExtendedDTraceProbes".
33 *
34 * COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
35 *
36 * CDDL HEADER START
37 *
38 *  The contents of this file are subject to the terms of the
39 *  Common Development and Distribution License, Version 1.0 only
40 *  (the "License").  You may not use this file except in compliance
41 *  with the License.
42 *
43 *  You can obtain a copy of the license at Docs/cddl1.txt
44 *  or http://www.opensolaris.org/os/licensing.
45 *  See the License for the specific language governing permissions
46 *  and limitations under the License.
47 *
48 * CDDL HEADER END
49 *
50 * 09-Sep-2007	Brendan Gregg	Created this.
51 */
52
53#pragma D option quiet
54#pragma D option defaultargs
55
56inline int SCREEN = 21;
57
58dtrace:::BEGIN
59{
60	execs = threads = methods = objnew = cload = gc = exception = 0;
61	lines = SCREEN + 1;
62	interval = $1 ? $1 : 1;
63	counts = $2 ? $2 : -1;
64	secs = interval;
65	first = 1;
66}
67
68profile:::tick-1sec
69{
70	secs--;
71}
72
73/*
74 * Print Header
75 */
76dtrace:::BEGIN,
77profile:::tick-1sec
78/first || (secs == 0 && lines > SCREEN)/
79{
80	printf("%-20s %6s %8s %8s %8s %8s %6s %6s\n", "TIME", "EXEC/s",
81	    "THREAD/s", "METHOD/s", "OBJNEW/s", "CLOAD/s", "EXCP/s", "GC/s");
82	lines = 0;
83	first = 0;
84}
85
86/*
87 * Tally Data
88 */
89proc:::exec-success
90/execname == "java"/
91{
92	execs++;
93}
94
95hotspot*:::thread-start
96{
97	threads++;
98}
99
100hotspot*:::method-entry
101{
102	methods++;
103}
104
105hotspot*:::object-alloc
106{
107	oalloc++;
108}
109
110hotspot*:::class-loaded
111{
112	cload++;
113}
114
115hotspot*:::gc-begin
116{
117	gc++;
118}
119
120hotspot*:::ExceptionOccurred-entry
121{
122	exception++;
123}
124
125/*
126 * Print Output
127 */
128profile:::tick-1sec
129/secs == 0/
130{
131	printf("%-20Y %6d %8d %8d %8d %8d %6d %6d\n", walltimestamp,
132	    execs / interval, threads / interval, methods / interval,
133	    oalloc / interval, cload / interval, exception / interval,
134	    gc / interval);
135	execs = threads = methods = oalloc = cload = gc = exception = 0;
136	secs = interval;
137	lines++;
138	counts--;
139}
140
141/*
142 * End
143 */
144profile:::tick-1sec
145/counts == 0/
146{
147        exit(0);
148}
149