Lr_output_message and Lr_log_message__loadrunner in LoadRunner

Lr_output_message and Lr_log_message in LoadRunner
(1) In Vgen, we have to write output function output information, we want to understand the information to use the function output, there are so many functions output information: Lr_output_message,lr_error_message,lr_log_message. These functions refer to help-->function Reference.
Secondly, we want to set in runtime settings, tick always send messages, the specific approach is: Runtime settings--->log-->always send messages, So we can write log, in the folder where our script is located, two files are important, mdrv.log.txt and output.txt files, Lr_log_message will only send information to mdrv.log files, and Lr_output_ Message will be written in the above two files.
(2) in the controller, many friends would like to know how many iterations, the correct parameters are imported, we still look at log, we at the end of execution, view the Results directory log folder, if the load generator is running, then in the TMP directory. However, also want to remind friends, in controller we also want to set runtime settings, and each user group runtime settings, set the method is: in the Controller Design tab page, The lower-right corner has the runtime Settings button, and we click on it to set the same method as in Vgen.