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[[Category:Tutorials|Intel VTune Tutorials: Introduction]]<nowiki /> {{DISPLAYTITLE:Intel VTune Tutorial: Introduction}}<nowiki /> {{Syllabus Intel VTune Tutorial}} __TOC__ The first tutorial video is introducing the Intel VTune profiler. It covers questions of what it is and how it works. The video ends with an example of how to run a first analysis with the "performance snapshot" type. === Video === <!--T:5--> <youtube width="600" height="340" right>4jwhjsN_Ock</youtube> ([[Media:VTune_introduction.pdf |Slides as pdf]]) === Quiz === <!--T:5--> {{hidden begin |title = 1. What does a profiler do?}} <quiz display=simple> { |type="()"} - Producing pretty screenshots of source code for presentations || Not correct. A profiler might be able to show source code, but its primary purpose is not presentation, but analysis. - Improving the performance of a program || Not correct. A profiler can help with optimization, but it does not optimize an application on its own + Provides insight into an application || Correct! For example, it measures time spent in certain sections of the code and can quantify the parallel performance. </quiz> {{hidden end}} {{hidden begin |title = 2. What does the Performance Snapshot analysis type do?}} <quiz display=simple> { |type="()"} + Use first measurements to recommend which analysis types should be considered next || Correct, the Performance Snapshot is a good first step that highlights which analysis types are likely to help the most. - Provide an in-depth performance analysis with detailed results || Not correct. The result presentation is brief and intended to give an overview. - Automatically run a shorter version of an existing application || Not correct. The user has to decide about the test case workload and analysis types don't affect this. </quiz> {{hidden end}} {{hidden begin |title = 3. What does event based sampling refer to??}} <quiz display=simple> { |type="()"} - In-depth instrumentation of an application during compilation to send performance "events" to the analysis application || Not correct. Event based sampling does not require the application to be recompiled with instrumentation. The application does not necessarily know that it is being analysed. - Performance analysis of an application by analysing the user input events || Not correct. I have no idea how that would even work. But Keyboards and mice do send "events" as well. + Regular sampling of performance counters during program execution || Correct. Performance counters count events and regular samples are attributed the current location in the program execution. </quiz> {{hidden end}} {{hidden begin |title = 4. Do you always need the kernel module to profile with Intel VTune?}} <quiz display=simple> { |type="()"} - Yes, there is no other way for VTune to access the hardware performance counters || Not correct. On an average Linux computer, it is possible to go through Linux perf or use the less detailed "user sampling" mode. + No, VTune can use "Linux perf" or the less detailed "user sampling" mode || Correct! You can always run a less detailed analysis or go through "Linux perf". VTune will tell you in the GUI if it is possible or not. - No, VTune can always access performance counters || Not correct. A system administrator might restrict the access for security reasons, for example. </quiz> {{hidden end}} {{hidden begin |title = 5. How do you start Intel VTune? (Assuming a working installation)}} <quiz display=simple> { |type="()"} - By typing <source enclose="none">intelvtune</source> in the commandline || Not correct. This is command does not exist by default. - <source enclose="none">vtune-gui</source> will always work || Not correct. This depends on how VTune was installed. It is often required to use a source script or load an environment module. + <source enclose="none">vtune-gui</source>, after the environment was set up with a source script or through <source enclose="none">module load</source> (depends on installation) || Correct! It is likely that you have to set up your environment first. Either through a source script that is shipped with the installation or a module load. </quiz> {{hidden end}}

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