Dynamic parameterization

Problem is to get dynamic proxy name and details (username,password) based on the different load generator machine. These machines could be in different zones with having different proxy servers.

Following code helps in getting the proxy details based on the current machine. Same solution can be used when we have to pick the substitution from the parameter list based on any condition. One example could be a search term. Say for Example I have n number of search term some search terms are invalid. Our requirement could be if a search term is invalid run the search query for same user with different search term.




int i, result;
char *current_host;
current_host = lr_get_host_name();
lr_output_message("The Actual Host is %s", current_host);
//Run the loop based on the number hosts you have in the parameter list
for(i=0;i<=20;i++)
{
lr_output_message("Current Host being verified is %s", lr_eval_string("{Host_Name}"));


if(strcmp(current_host,lr_eval_string("{Host_Name}"))==0)
{
lr_output_message("Setting the Username (%s), Password (%s) & Domain Name (%s) related to Host Name (%s)", lr_eval_string("{User_Name}"),lr_eval_string("{Password}"), lr_eval_string("{Domain}"), lr_eval_string("{Host_Name}"));
web_set_user("{User_Name}", "{Password}", "{Domain}");
break;
}
else
{
lr_output_message("Current Host evaluated is (%s) not matching with actual host", lr_eval_string("{Host_Name}"));
lr_advance_param("Host_Name");
}

Replay Engine in LoadRunner

Loadrunner have support for Socket and Winlnet replay engines for replaying the script. We can control this setting from Replay>Run Time Settings.

In above screenshot we can see there is an option to change replay choice between Sockets and WinInet. By default Loadrunner use the socket options and we should also use Socket only unless we WinInet is the only choice.

Socket is a scalable approach which used Loadrunner proprietary interface to communicate with the network whereas WinInet uses WinInet API which is used by Internet Explorer to communicate with the network. WinInet helps in resolving issues with the playback but it is not recommended for running the load test as it comes with the limitation of scalability.

Switching to winInet option is a good step to troubleshoot the replay errors.