VuGen: Measure transaction timings in milliseconds

Let’s say you are testing a web application and the service level agreement of response times for each web page is 1.5 seconds or below. You might want to automatically fail any transaction that comes back in a longer amount of time. You will need to measure the number of milliseconds in the transaction, and see exceeds this amount. You might need to set something like this up for any transaction where timing for milliseconds is crucial. Just because the business process passes, does not mean the transaction should pass, especially when there is a service level agreement in place.

/*
 
This function will get the current time in milliseconds.
First, setup 3 parameters in LoadRunner called milliseconds, hours, and minutes with the following formats:
 
1. milliseconds %s.000 will return seconds.milliseconds of the current time
2. hours %H will return the hour portion of the current time in military formatrmat
3. minutes %M will return the minutes portion of the time set them to update on each occurrence
 
*/
 
long int get_time()
{
  int milliseconds, seconds, minutes, hours;
  long int totalMilliseconds;
 
  //these chars are set 1 byte bigger to account for the null zero
  char temp[7], tempSecs[3], tempMilliseconds[4];
 
  //temp = SS.MMM, tempSecs = SS, tempMilliseconds = MMM
 
  sprintf(temp, "%s", lr_eval_string("{milliseconds}"));
  memset(tempSecs, sizeof(tempSecs), '\0');
  strncpy(tempSecs, temp, 2);
 
  //copy 2 characters from tempSecs to temp
  seconds = atoi(tempSecs);
 
  //add 3 to temp and get millisecond portion
  memset(tempMilliseconds, sizeof(tempMilliseconds), 0);
  strncpy(tempMilliseconds, temp+3, 3);
  milliseconds = atoi(tempMilliseconds);
 
  //Get current hours
  hours = atoi(lr_eval_string("{hours}"));
 
  //Get current minutes
  minutes = atoi(lr_eval_string("{minutes}"));
 
  lr_output_message("This is the current time %02d:%02d:%02d.%03d", hours, minutes, seconds, milliseconds);
 
  //Compute milliseconds
  totalMilliseconds = (hours * 3600000) + (minutes * 60000) + (seconds * 1000) + milliseconds;
 
  lr_output_message("This is the current time in milliseconds {%ld}", totalMilliseconds);
 
  return (totalMilliseconds);
}
/*
Here is how you would use the script in LoadRunner:
 
You will need to set up two integer variables in your main action file at the top. For this example I am going to set up one called startTime and one called CurrentTime:
 
*/
 
int startTime, currentTime;
 
//Get the current time and save into the variable startTime:
startTime = get_time();
 
// now start a transaction:
lr_start_transaction("MainPage");
 
// then put all the statements that should be within that
// transaction. Here we are only going to have one web_url():
web_url("somewebpage", "URL=http://www.web.com", "RecContentType=text/html", LAST);
 
// before you end the transaction, get the current time with
// get_time() again and store into currentTime
currtentTime = get_time();
 
// set up an "if" statement to determine if you should manually
//fail the transaction or let it pass
if (currentTime - startTime > 1500)
{
  lr_end_transaction("MainPage", LR_FAIL);
}
else
{
  lr_end_transaction("MainPage", LR_PASS);
}

What's Next?

Did you enjoy this article? Help spread the word by sharing:

Join the Northway Navigator Club today and get access to restricted content including our best tips and tricks. Membership is free! You will also receive free email updates by registering.

Engage in the conversation and leave a comment:

Scott Moore

About Scott Moore (153 articles)

With over 20 years of IT experience with various platforms and technologies, Scott has tested some of the largest applications and infrastructures in the world. He is a Certified Instructor and Certified Product Consultant in HP’s LoadRunner and Performance Center products. He currently holds HP certifications for ASE, ASC, and CI. A thought leader in the APM space, he speaks regularly at IT conferences and events