statistics.cpp
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1 /*
2  * Copyright (C) 2013-2014, Dariush Forouher
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27 
28 #include "ros/statistics.h"
29 #include "ros/node_handle.h"
30 #include <rosgraph_msgs/TopicStatistics.h>
31 #include "ros/this_node.h"
32 #include "ros/message_traits.h"
33 #include "std_msgs/Header.h"
34 #include "ros/param.h"
35 
36 namespace ros
37 {
38 
40 : pub_frequency_(1.0)
41 {
42 }
43 
45  hasHeader_ = helper->hasHeader();
46  param::param("/enable_statistics", enable_statistics, false);
47  param::param("/statistics_window_min_elements", min_elements, 10);
48  param::param("/statistics_window_max_elements", max_elements, 100);
49  param::param("/statistics_window_min_size", min_window, 4);
50  param::param("/statistics_window_max_size", max_window, 64);
51 }
52 
54  const std::string& topic, const std::string& callerid, const SerializedMessage& m, const uint64_t& bytes_sent,
55  const ros::Time& received_time, bool dropped, int connection_id)
56 {
57  (void)connection_header;
58  struct StatData stats;
59 
60  if (!enable_statistics)
61  {
62  return;
63  }
64 
65  // ignore /clock for safety and /statistics to reduce noise
66  if (topic == "/statistics" || topic == "/clock")
67  {
68  return;
69  }
70 
71  // callerid identifies the connection
72  std::map<std::string, struct StatData>::iterator stats_it = map_.find(callerid);
73  if (stats_it == map_.end() || previous_connection_id != connection_id)
74  {
75  // this is the first time, we received something on this connection
76  stats.stat_bytes_last = 0;
77  stats.dropped_msgs = 0;
78  stats.last_seq = 0;
79  stats.last_publish = ros::Time::now();
80  map_[callerid] = stats;
81  }
82  else
83  {
84  stats = map_[callerid];
85  }
86  previous_connection_id = connection_id;
87 
88  stats.arrival_time_list.push_back(received_time);
89 
90  if (dropped)
91  {
92  stats.dropped_msgs++;
93  }
94 
95  // try to extract header, if the message has one. this fails sometimes,
96  // therefore the try-catch
97  if (hasHeader_)
98  {
99  try
100  {
101  std_msgs::Header header;
104  if (!header.stamp.isZero())
105  {
106  stats.age_list.push_back(received_time - header.stamp);
107  }
108  }
110  {
111  ROS_DEBUG("Error during header extraction for statistics (topic=%s, message_length=%li)", topic.c_str(), m.num_bytes - (m.message_start - m.buf.get()));
112  hasHeader_ = false;
113  }
114  }
115 
116  // should publish new statistics?
117  double pub_period = 1.0 / pub_frequency_;
118  if (stats.last_publish + ros::Duration(pub_period) < received_time)
119  {
120  ros::Time window_start = stats.last_publish;
121  stats.last_publish = received_time;
122 
123  // fill the message with the aggregated data
124  rosgraph_msgs::TopicStatistics msg;
125  msg.topic = topic;
126  msg.node_pub = callerid;
127  msg.node_sub = ros::this_node::getName();
128  msg.window_start = window_start;
129  msg.window_stop = received_time;
130  msg.delivered_msgs = stats.arrival_time_list.size();
131  msg.dropped_msgs = stats.dropped_msgs;
132  msg.traffic = bytes_sent - stats.stat_bytes_last;
133 
134  // not all message types have this
135  if (stats.age_list.size() > 0)
136  {
137  double stamp_age_sum = 0.0;
138  msg.stamp_age_max = ros::Duration(0);
139 
140  for(std::list<ros::Duration>::iterator it = stats.age_list.begin(); it != stats.age_list.end(); it++)
141  {
142  ros::Duration age = *it;
143  stamp_age_sum += age.toSec();
144 
145  if (age > msg.stamp_age_max)
146  {
147  msg.stamp_age_max = age;
148  }
149  }
150 
151  msg.stamp_age_mean = ros::Duration(stamp_age_sum / stats.age_list.size());
152 
153  double stamp_age_variance = 0.0;
154  for(std::list<ros::Duration>::iterator it = stats.age_list.begin(); it != stats.age_list.end(); it++)
155  {
156  ros::Duration t = msg.stamp_age_mean - *it;
157  stamp_age_variance += t.toSec() * t.toSec();
158  }
159  double stamp_age_stddev = sqrt(stamp_age_variance / stats.age_list.size());
160  try
161  {
162  msg.stamp_age_stddev = ros::Duration(stamp_age_stddev);
163  }
164  catch(std::runtime_error& e)
165  {
166  msg.stamp_age_stddev = ros::Duration(0);
167  ROS_WARN_STREAM("Error updating stamp_age_stddev for topic [" << topic << "]"
168  << " from node [" << callerid << "],"
169  << " likely due to the time between the mean stamp age and this message being exceptionally large."
170  << " Exception was: " << e.what());
171  ROS_DEBUG_STREAM("Mean stamp age was: " << msg.stamp_age_mean << " - std_dev of: " << stamp_age_stddev);
172  }
173 
174  }
175  else
176  {
177  // in that case, set to NaN
178  msg.stamp_age_mean = ros::Duration(0);
179  msg.stamp_age_stddev = ros::Duration(0);
180  msg.stamp_age_max = ros::Duration(0);
181  }
182 
183  // first, calculate the mean period between messages in this connection
184  // we need at least two messages in the window for this.
185  if (stats.arrival_time_list.size() > 1)
186  {
187  msg.period_mean = ros::Duration(0);
188  msg.period_max = ros::Duration(0);
189 
190  ros::Time prev;
191  for(std::list<ros::Time>::iterator it = stats.arrival_time_list.begin(); it != stats.arrival_time_list.end(); it++) {
192 
193  if (it == stats.arrival_time_list.begin()) {
194  prev = *it;
195  continue;
196  }
197 
198  ros::Duration period = *it - prev;
199  msg.period_mean += period;
200  if (period > msg.period_max)
201  msg.period_max = period;
202  prev = *it;
203  }
204  msg.period_mean *= 1.0 / (stats.arrival_time_list.size() - 1);
205 
206  // then, calc the stddev
207  double period_variance = 0.0;
208  for(std::list<ros::Time>::iterator it = stats.arrival_time_list.begin(); it != stats.arrival_time_list.end(); it++)
209  {
210  if (it == stats.arrival_time_list.begin())
211  {
212  prev = *it;
213  continue;
214  }
215  ros::Duration period = *it - prev;
216  ros::Duration t = msg.period_mean - period;
217  period_variance += t.toSec() * t.toSec();
218  prev = *it;
219  }
220  double period_stddev = sqrt(period_variance / (stats.arrival_time_list.size() - 1));
221  msg.period_stddev = ros::Duration(period_stddev);
222  }
223  else
224  {
225  // in that case, set to NaN
226  msg.period_mean = ros::Duration(0);
227  msg.period_stddev = ros::Duration(0);
228  msg.period_max = ros::Duration(0);
229  }
230 
231  if (!pub_.getTopic().length())
232  {
233  ros::NodeHandle n("~");
234  // creating the publisher in the constructor results in a deadlock. so do it here.
235  pub_ = n.advertise<rosgraph_msgs::TopicStatistics>("/statistics", 1);
236  }
237 
238  pub_.publish(msg);
239 
240  // dynamic window resizing
241  if (stats.arrival_time_list.size() > static_cast<size_t>(max_elements) && pub_period / 2.0 >= min_window)
242  {
243  pub_frequency_ *= 2;
244  }
245  if (stats.arrival_time_list.size() < static_cast<size_t>(min_elements) && pub_period * 2.0 <= max_window)
246  {
247  pub_frequency_ /= 2;
248  }
249 
250  // clear the window
251  stats.age_list.clear();
252  stats.arrival_time_list.clear();
253  stats.dropped_msgs = 0;
254  stats.stat_bytes_last = bytes_sent;
255 
256  }
257  // store the stats for this connection
258  map_[callerid] = stats;
259 }
260 
261 
262 } // namespace ros
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Author(s): Morgan Quigley, Josh Faust, Brian Gerkey, Troy Straszheim, Dirk Thomas , Jacob Perron
autogenerated on Sat Sep 14 2024 02:59:35