Difference between revisions of "Gprof Tutorial"
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{{hidden begin | {{hidden begin | ||
| − | |title = 1. What | + | |title = 1. What is a call graph? |
}} | }} | ||
<quiz display=simple> | <quiz display=simple> | ||
{ | { | ||
|type="()"} | |type="()"} | ||
| − | - | + | - |
| − | || | + | || An android app to show incoming callers |
| − | + | + | + |
| − | || | + | || A hierarchy diagram of function calls in a given profile |
| − | - | + | - |
| − | || | + | || Instructions of how to call for help during emergencies |
| + | </quiz> | ||
| + | {{hidden end}} | ||
| + | |||
| + | {{hidden begin | ||
| + | |title = 2. How do you generate a callgraph of a gprof profile? | ||
| + | }} | ||
| + | <quiz display=simple> | ||
| + | { | ||
| + | |type="()"} | ||
| + | - | ||
| + | || gprof --call-graph | ||
| + | - | ||
| + | || gprof | ||
| + | + | ||
| + | || gprof --graph | ||
| + | </quiz> | ||
| + | {{hidden end}} | ||
| + | |||
| + | {{hidden begin | ||
| + | |title = 3. What is gprof2dot? | ||
| + | <quiz display=simple> | ||
| + | { | ||
| + | |type="()"} | ||
| + | + | ||
| + | || Third party script for call graph visualization via the "dot" library | ||
| + | - | ||
| + | || Gprof feature to export profiles as a pdf | ||
| + | - | ||
| + | || A fork of the beta version of gprof2 | ||
| + | </quiz> | ||
| + | {{hidden end}} | ||
| + | |||
| + | {{hidden begin | ||
| + | |title = 4. Does gprof work with MPI applications? | ||
| + | <quiz display=simple> | ||
| + | { | ||
| + | |type="()"} | ||
| + | - | ||
| + | || No, gprof only works with sequential applications | ||
| + | - | ||
| + | || Yes, parallel profiling is the main use case of gprof | ||
| + | + | ||
| + | || Yes, but gprof cannot differentiate between individual threads/processes | ||
| + | </quiz> | ||
| + | {{hidden end}} | ||
| + | |||
| + | {{hidden begin | ||
| + | |title = 5. How much overhead does gprof produce? | ||
| + | <quiz display=simple> | ||
| + | { | ||
| + | |type="()"} | ||
| + | - | ||
| + | || None | ||
| + | + | ||
| + | || Little | ||
| + | - | ||
| + | || Much | ||
</quiz> | </quiz> | ||
{{hidden end}} | {{hidden end}} | ||
Revision as of 11:56, 2 November 2020
| HPC.NRW | |
|---|---|
 | |
| Associated Pages | |
| + | This is an #HPC.NRW course |
| HPC Courses | |
| 1. | Introduction to Linux in HPC |
| 2. | Gprof Tutorial |
| 3. | OpenMP in Small Bites
|
Gprof is a free and easy-to-use profiler.
Gprof Introduction + Pascal Example
Quiz
1. What lanuages can gprof profile?
2. How does gprof profiles an application?
3. What compiler flag is used to instrument the application?
How should the parameters be when running the instrumented application?
C++ + Fortran Examples
Show gprof in real world examples and introduce call graph.
Quiz
1. What is a call graph?
2. How do you generate a callgraph of a gprof profile?
{{hidden begin |title = 3. What is gprof2dot?
{{hidden begin |title = 4. Does gprof work with MPI applications?
{{hidden begin |title = 5. How much overhead does gprof produce?