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 };