1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_TIMER_HPP 26 #define SHARE_VM_RUNTIME_TIMER_HPP 27 28 #include "utilities/globalDefinitions.hpp" 29 30 // Timers for simple measurement. 31 32 class elapsedTimer VALUE_OBJ_CLASS_SPEC { 33 friend class VMStructs; 34 private: 35 jlong _counter; 36 jlong _start_counter; 37 bool _active; 38 public: 39 elapsedTimer() { _active = false; reset(); } 40 void add(elapsedTimer t); 41 void start(); 42 void stop(); 43 void reset() { _counter = 0; } 44 double seconds() const; 45 jlong milliseconds() const; 46 jlong ticks() const { return _counter; } 47 jlong active_ticks() const; 48 bool is_active() const { return _active; } 49 }; 50 51 // TimeStamp is used for recording when an event took place. 52 class TimeStamp VALUE_OBJ_CLASS_SPEC { 53 private: 54 jlong _counter; 55 public: 56 TimeStamp() { _counter = 0; } 57 void clear() { _counter = 0; } 58 // has the timestamp been updated since being created or cleared? 59 bool is_updated() const { return _counter != 0; } 60 // update to current elapsed time 61 void update(); 62 // update to given elapsed time 63 void update_to(jlong ticks); 64 // returns seconds since updated 65 // (must not be in a cleared state: must have been previously updated) 66 double seconds() const; 67 jlong milliseconds() const; 68 // ticks elapsed between VM start and last update 69 jlong ticks() const { return _counter; } 70 // ticks elapsed since last update 71 jlong ticks_since_update() const; 72 }; 73 74 // TraceTime is used for tracing the execution time of a block 75 // Usage: 76 // { TraceTime t("block time") 77 // some_code(); 78 // } 79 // 80 81 class TraceTime: public StackObj { 82 private: 83 bool _active; // do timing 84 bool _verbose; // report every timing 85 elapsedTimer _t; // timer 86 elapsedTimer* _accum; // accumulator 87 public: 88 // Constructors 89 TraceTime(const char* title, 90 bool doit = true); 91 TraceTime(const char* title, 92 elapsedTimer* accumulator, 93 bool doit = true, 94 bool verbose = false); 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 }; 122 123 class TimeHelper { 124 public: 125 static double counter_to_seconds(jlong counter); 126 }; 127 128 #endif // SHARE_VM_RUNTIME_TIMER_HPP