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comparison src/share/vm/runtime/timer.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // Timers for simple measurement.
26
27 class elapsedTimer VALUE_OBJ_CLASS_SPEC {
28 friend class VMStructs;
29 private:
30 jlong _counter;
31 jlong _start_counter;
32 bool _active;
33 public:
34 elapsedTimer() { _active = false; reset(); }
35 void add(elapsedTimer t);
36 void start();
37 void stop();
38 void reset() { _counter = 0; }
39 double seconds() const;
40 jlong milliseconds() const;
41 jlong ticks() const { return _counter; }
42 jlong active_ticks() const;
43 bool is_active() const { return _active; }
44 };
45
46 // TimeStamp is used for recording when an event took place.
47 class TimeStamp VALUE_OBJ_CLASS_SPEC {
48 private:
49 jlong _counter;
50 public:
51 TimeStamp() { _counter = 0; }
52 void clear() { _counter = 0; }
53 // has the timestamp been updated since being created or cleared?
54 bool is_updated() const { return _counter != 0; }
55 // update to current elapsed time
56 void update();
57 // update to given elapsed time
58 void update_to(jlong ticks);
59 // returns seconds since updated
60 // (must not be in a cleared state: must have been previously updated)
61 double seconds() const;
62 jlong milliseconds() const;
63 // ticks elapsed between VM start and last update
64 jlong ticks() const { return _counter; }
65 // ticks elapsed since last update
66 jlong ticks_since_update() const;
67 };
68
69 // TraceTime is used for tracing the execution time of a block
70 // Usage:
71 // { TraceTime t("block time")
72 // some_code();
73 // }
74 //
75
76 class TraceTime: public StackObj {
77 private:
78 bool _active; // do timing
79 bool _verbose; // report every timing
80 bool _print_cr; // add a CR to the end of the timer report
81 elapsedTimer _t; // timer
82 elapsedTimer* _accum; // accumulator
83 outputStream* _logfile; // output log file
84 public:
85 // Constuctors
86 TraceTime(const char* title,
87 bool doit = true,
88 bool print_cr = true,
89 outputStream *logfile = NULL);
90 TraceTime(const char* title,
91 elapsedTimer* accumulator,
92 bool doit = true,
93 bool verbose = false,
94 outputStream *logfile = NULL );
95 ~TraceTime();
96
97 // Accessors
98 void set_verbose(bool verbose) { _verbose = verbose; }
99 bool verbose() const { return _verbose; }
100
101 // Activation
102 void suspend() { if (_active) _t.stop(); }
103 void resume() { if (_active) _t.start(); }
104 };
105
106 class TraceCPUTime: public StackObj {
107 private:
108 bool _active; // true if times will be measured and printed
109 bool _print_cr; // if true print carriage return at end
110 double _starting_user_time; // user time at start of measurement
111 double _starting_system_time; // system time at start of measurement
112 double _starting_real_time; // real time at start of measurement
113 outputStream* _logfile; // output is printed to this stream
114 bool _error; // true if an error occurred, turns off output
115
116 public:
117 TraceCPUTime(bool doit = true,
118 bool print_cr = true,
119 outputStream *logfile = NULL);
120 ~TraceCPUTime();
121 };