I am using licensed version of Vtune Performance Analyzer 7.2.
I have some basic queries regarding Vtune:
1. In advanced Activation Configuration category I can use Sampling, call graph and Counter monitor data collectors, there is a field called "duration" (by default 20), what is the significance of this field?
Is it like, Vtune is an event based sample collector and Vtune will collect data only for this much of duration and will stop after that(but my process keeps running after 20 seconds in Vtune also)
It can be understood for Sampling Data Collector as it collects data regarding processor events but what is the significance of this duration in Call Graph or counter monitor data?
And one more thing if I am running an application like Encoder code base .exe with duration 20 and with 100000 for sampling Data collector , then what will be the difference in my output parameters given by Vtune(say clockticks, instruction retired etc) and why? As I have seen if I am giving duration as 20 then my FPS value (derived from total clockticks events) is not correct (as we have some prior assumption for FPS by other time
measurement methods) so we are using it as 100000 now and we think it is right, why is it so now?
2. What is the difference among Vtune Performance Analyzer's time measurement and other time measurement methods (like query performance method)? If my Vtune is running with other processes (user applications say media player or etc) then what will be difference in output parameters of Vtune parameters when running with no such applications except system processes. Does Vtune also include that time also?