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During the installation of LoadRunner if you select “Allow virtual users to run on this machine without user login”, the LoadRunner agent will run as a Windows system service called “LoadRunner Agent Service”.

If you choose “Manually log in to the Load Generator “, the LoadRunner agent will be run as a process named magentproc.exe.  This means you need to start the LoadRunner agent manually each time you reboot the PC/server or you need to put the LoadRunner agent process into a windows startup group.

Some vUser types will only run if the agent is running as a service (GUI, SAP, Citrix etc.). This is because they need to run in a user context.

After installation, to switch from running the LoadRunner agent as a service to running as a process:
magentservice.exe -remove
Add this shortcut to the startup folder – “C:\Program Files (x86)\HP\LoadRunner\LAUNCH_SERVICE\bin\magentproc.exe”

After installation, to switch from running the LoadRunner agent as a process to running as a service:
Remove the LoadRunner Agent Process from the Startup folder
magentservice.exe -install

N.B. You need admin rights to do this. The magentservice.exe file is in the C:\Program Files (x86)\HP\LoadRunner\bin or C:\Program Files\HP\LoadRunner\bin folder.

I had a requirement to calculate the epoch time in milliseconds for midnight at the start of today.

This function calculates this value.

 

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Action() {

// Epoch time on 1/1/2010 00:00:00 was 1262304000
// N.B, If running this in subsequent years, change the hard coded value on the next line. // Value obtained from http://www.epochconverter.com/

//Declare integer iEpochStartYear – use it to hold the Epoch time (in secs) on 1st January this year.
int iEpochStartYear = 1262304000;      

//Declare integer to hold calculated value of Epoch time last midnight.
int iEpochSecsLastMidnight;            

//Declare integer to hold the current day (i.e. num of days since 1st Jan 2010)
int iCurrentDay;                  

//Declare char to contain final output value (N.B in milliseconds, not seconds)
char sEpochMilliSecsLastMidnight[13];   

// Current day is number of days since start of 1st Jan 2010.
// Need to subtract one day since midnight is nominally the end of yesterday (rather than the start of today).

lr_save_datetime(“%j “, DATE_NOW – ONE_DAY, “sCurrentDay”);

//Convert the SCurrentDay string to an integer
iCurrentDay = atoi(lr_eval_string(“{sCurrentDay}”));               

//Calculate Epoch time (in seconds) for last midnight
iEpochSecsLastMidnight = iEpochStartYear + (iCurrentDay * 86400);     

//Write Epoch time (in milliseconds) for last midnight to a string
sprintf(sEpochMilliSecsLastMidnight, “%d000”, iEpochSecsLastMidnight);    

lr_output_message(sEpochMilliSecsLastMidnight);

return 0; }