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→Algorithm Optimization
The Hotspot analysis feature in the Intel Vtune Profiler allows you to dig deeper into your application and identify pieces of code which are taking a long time to execute. These hot spots can be used to identify problem areas in your application and help improve performance.
==== User-Mode Sampling ====
User-Mode sampling is the default option for the Vtune Profiler and this sampling method utilizes a low overhead that allows collection of information without a significant impact on the run time of your application. Utilizing a sampling interval of 10ms, the profiler collects data using the following steps:
• Interrupts the process
• Collects samples of active instruction addresses
• Records a copy of the stack
The profiler then stores the sampled instruction pointer as well as the stacks to analyze and display back the data. The instruction pointers along with the stack data enable the profiler to put together a top-down tree which will allow a better understanding of the control flow of important code blocks.
The user-mode sampling method will only gather data relating to your application and not the wider system performance. The results will show total time usage of functions within the application. If many samples are collected during a specific process or thread, we can identify these as hotspots and potential bottlenecks in the performance of the application.
== Microarchitecture and Memory Bottlenecks ==
