- application servers under test are placed under stress by
- driver processes mdrv.exe (the Multi-threaded Driver Process) and r3vuser.exe which emulate application clients such as Internet Explorer web brower. It performs 3 main actions:
Kli> cpp (C language pre-processor)
- cci (C pre-compiling) which creaes a file with ci file, and
- execute using the driver for the protocol technology being tested.
Runs can be invoked to run "silently" by invoking Mdrv.exe from a Windows batch script.
Mdrv can automatically stop loading Vusers because they communicate with Vusers and monitor CPU usage on Windows Load Generator machines.
A separate JVM is instantiated by each Java-based Vuser on Windows-based machines. Java Vusers are not supported on Unix platforms.
- virtual Vusers are invoked as groups (logical collection of virtual users running the same script on a specific load generator machine)
- by agents (3,900K magentproc.exe) running as a service or as a process
- on load generator client machines.
- Each machine hosting agents maintains an Execution Log in a .qtp file.
- When logging is enabled, the agent also creates within the results folder a sequential log file for each Vuser (segregated by Vuser group).
- During execution, this file is displayed in the view > Show Output window on the LoadRunner Controller machine.
- Upon a pre-set delay, the Scheduler running on a Controller machine instructs agents (via Windows port 54345 or dynamic Unix port) to initiate test session scenarios. The Controller (wlrun.exe) sends a copy of scenario files along with the request.
- Agents are launched by the Remote Agent Dispatcher process (formerly called Remote Command Launcher (RCL)) on each load generator machine.
- Each agent refer to scenario (.lrs) definition files to determine which Vuser groups and scripts to run on host machines.
This means the Controller can be started from a DOS batch (.bat) file (preferrably with a short name on a root drive):
REM Start Controller: SET M_ROOT=C:\Program Files\HP\LoadRunner\bin cd %M_ROOT% wlrun.exe -TestPath D:\Dev\Dev1.lrs -port 8080 -Run -DontClose pause Press Ctrl-Z to keep this window or
- Including the -Run parameter is the same as manually pressing the "Start Scenario" automatically upon invocation. This is not a good idea because you may have to decide about collating the file from a previous run or want to change the output folder.
- This assumes that the system's environment PATH variable
was updated to include where LoadRunner is installed.
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