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→Intel VTune™ Amplifier
==='''Introduction'''===
Intel VTune amplifier is a analysis software that allows you the ability to measure performance of your serial or multithreaded program. VTune allows you to analyze the performance of your algorithms and multithreading. It can help with debugging threads by calculating overhead, finding bottlenecks or inefficiencies.
==='''Create a project'''===
I will be explaining how to use VTune part Intel® Parallel Studio XE 2019 of the alongside Visual Studio 2017. Intel® Parallel Studio XE can be found here: https://software.intel.com/en-us/parallel-studio-xe.
[[File:tools_tab.PNG | 400px]]
==='''Configure a project'''===
When you hover over Intel VTune Amplifier 2019 in the tool’s menu. You will see more options appear.
'''Select configure Analysis.'''
[[File:options.PNG | 400px]]
The following screen will be displayed. Click on the three little dots circled in the below picture.
To expand more options for running VTune.
[[File:SetupOptions.PNG | 400px]]
This menu will appear, it contains different tests that you can run against your program. The I am going to look through is the default test Hotspots. Depending on your program you may want too to look into the other options.
[[File:startup options.PNG | 400px]]
==='''How it works'''===
On the main page we can run the test, by clicking on the blue play button.
[[File:start test.PNG | 400px]]
When the test completes, the summary page will be displayed. This will outline the results from the test.
[[File:test complete.PNG | 400px]]
==='''Interpreting results'''===
The following picture is the different tabs available from a hotspot analysis.
[[File:tabs.PNG | 400px]]
• Analysis configuration
o Main configuration page for VTune
• Collection log
o Logs from the analysis
• Summary
o Elapsed Time: this is the amount of time your program took to run
The CPU time: displays the effective, spin and overhead times.
o Top Hotspots: Displays the area’s that were most active in your program.
o Effective CPU Utilization Histogram: This shows the time your program spent using x number of threads. The graph shows x axis is the moments that your program was a certain number of threads. And the y axis is the time that your program used that number of threads for.
o Collection and Platform Info: this display’s all the hardware information about the computer the test was run on.
• Bottom-up
o Allows you to se the call stack of a function starting from the first call.
• Caller/Callee
o Allows you to see details on each function and see callers and callees for each function
• Top-down tree
o Shows the call stack of the program as a tree starting from the top.
• Platform
o Displays the time and the utilization of each thread.
