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Collect hierarchical data profile. * profiler.h: Retructure whole data collection. * profiler.cc: Ditto for implementation.
author Daniel Kraft <d@domob.eu>
date Thu, 11 Aug 2011 17:55:23 +0200
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children 43d78e103984
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1 /*
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2
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3 Copyright (C) 2011 Daniel Kraft
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_profiler_h)
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24 #define octave_profiler_h 1
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25
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26 #include <map>
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27 #include <set>
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28 #include <string>
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29 #include <vector>
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30
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31 class octave_value;
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32
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33 class
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34 OCTAVE_API
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35 profile_data_accumulator
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36 {
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37 public:
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38
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39 // This is a utility class that can be used to call the enter/exit
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40 // functions in a manner protected from stack unwinding.
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41 class enter
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42 {
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43 private:
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44
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45 profile_data_accumulator& acc;
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46 std::string fcn;
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47
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48 public:
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49
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50 enter (profile_data_accumulator&, const std::string&);
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51 virtual ~enter (void);
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52
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53 private:
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54
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55 // No copying!
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56 enter (const enter&);
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57 enter& operator = (const enter&);
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58 };
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59
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60 profile_data_accumulator (void);
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61 virtual ~profile_data_accumulator ();
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62
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63 bool is_active (void) const { return enabled; }
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64 void set_active (bool);
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65
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66 void reset (void);
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67
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68 octave_value get_flat (void) const;
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69 octave_value get_hierarchical (void) const;
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70
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71 private:
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72
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73 // One entry in the flat profile (i.e., a collection of data for a single
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74 // function). This is filled in when building the flat profile from the
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75 // hierarchical call tree.
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76 struct stats
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77 {
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78 stats ();
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79
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80 double time;
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81 unsigned calls;
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82
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83 bool recursive;
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84
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85 typedef std::set<octave_idx_type> function_set;
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86 function_set parents;
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87 function_set children;
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88
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89 // Convert a function_set list to an Octave array of indices.
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90 static octave_value function_set_value (const function_set&);
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91 };
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92
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93 typedef std::vector<stats> flat_profile;
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94
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95 // Store data for one node in the call-tree of the hierarchical profiler
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96 // data we collect.
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97 class tree_node
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98 {
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99 public:
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100
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101 tree_node (tree_node*, octave_idx_type);
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102 virtual ~tree_node ();
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103
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104 void add_time (double dt) { time += dt; }
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105
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106 // Enter a child function. It is created in the list of children if it
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107 // wasn't already there. The now-active child node is returned.
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108 tree_node* enter (octave_idx_type);
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109
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110 // Exit function. As a sanity-check, it is verified that the currently
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111 // active function actually is the one handed in here. Returned is the
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112 // then-active node, which is our parent.
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113 tree_node* exit (octave_idx_type);
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114
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115 void build_flat (flat_profile&) const;
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116 octave_value get_hierarchical (void) const;
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117
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118 private:
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119
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120 tree_node* parent;
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121 octave_idx_type fcn_id;
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122
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123 typedef std::map<octave_idx_type, tree_node*> child_map;
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124 child_map children;
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125
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126 // This is only time spent *directly* on this level, excluding children!
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127 double time;
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128
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129 unsigned calls;
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130
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131 // No copying!
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132 tree_node (const tree_node&);
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133 tree_node& operator = (const tree_node&);
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134 };
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135
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136 // Each function we see in the profiler is given a unique index (which
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137 // simply counts starting from 1). We thus have to map profiler-names to
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138 // those indices. For all other stuff, we identify functions by their index.
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139
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140 typedef std::vector<std::string> function_set;
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141 typedef std::map<std::string, octave_idx_type> fcn_index_map;
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142
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143 function_set known_functions;
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144 fcn_index_map fcn_index;
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145
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146 bool enabled;
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147
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148 tree_node* call_tree;
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149 tree_node* active_fcn;
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150
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151 // Store last timestamp we had, when the currently active function was called.
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152 double last_time;
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153
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154 // These are private as only the unwind-protecting inner class enter
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155 // should be allowed to call them.
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156 void enter_function (const std::string&);
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157 void exit_function (const std::string&);
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158
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159 // Query a timestamp, used for timing calls (obviously).
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160 // This is not static because in the future, maybe we want a flag
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161 // in the profiler or something to choose between cputime, wall-time,
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162 // user-time, system-time, ...
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163 double query_time () const;
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164
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165 // Add the time elapsed since last_time to the function we're currently in.
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166 // This is called from two different positions, thus it is useful to have
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167 // it as a seperate function.
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168 void add_current_time (void);
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169
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170 // No copying!
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171 profile_data_accumulator (const profile_data_accumulator&);
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172 profile_data_accumulator& operator = (const profile_data_accumulator&);
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173 };
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174
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175 // The instance used.
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176 extern profile_data_accumulator profiler;
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177
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178 #endif