In this article we will discuss how to measure execution time of any operation in C++.

Many time we encounter a situation, where we need to calculate the execution time of many operations to check performance. For example,

  • How much time was taken to push data in a vector etc.
  • How much time spent in searching data from a datastructure.
  • How much time was taken to send or receive a message through network etc.

To do that we will use boost::posix_time::ptime and boost::posix_time::time_duration types.

boost::posix_time::ptime represents a particular time point
boost::posix_time::time_duration represents a duration / difference between two time points.

Calculating Execution / Elapsed Time

To Measure execution time we will fetch the current time 2 times, one before the operation and one after the operation.
Difference between these two timestamps will give us the execution time of the operation i.e.

Start Time = Get Current Time
Execute Task
End Time = Get Current Time
Time Duration = End Time – Start Time

Suppose our task is to insert 9 Millions strings to a vector of strings. Let’s see how to measure the execution time using
above algo and ptime & time_duration i.e.

Now from boost::posix_time::time_duration we can get hours, minutes & Second field using its member functions i.e.

Total Time Elapsed in milliseconds, microseconds & nanoseconds

We can also get the total time difference in milliseconds, microseconds & Nano seconds i.e.

Getting Total Execution Time in MilliSeconds

Getting Total Execution Time in MicroSeconds

Getting Total Execution Time in NanoSeconds

Complete working example is as follows,

Output:

To compile the above code use following command in linux,

 

 

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