Extra-P, automated empirical performance modeling for HPC and scientific applications
Project description
Extra-P
Automated performance modeling for HPC applications
Extra-P is an automatic performance-modeling tool that supports the user in the identification of scalability bugs.
A scalability bug is a part of the program whose scaling behavior is unintentionally poor,
that is, much worse than expected. A performance model is a formula that expresses a performance metric of interest
such as execution time or energy consumption as a function of one or more execution parameters such as the size of the
input problem or the number of processors.
Extra-P uses measurements of various performance metrics at different execution configurations as input to generate performance models of code regions (including their calling context) as a function of the execution parameters. All it takes to search for scalability issues even in full-blown codes is to run a manageable number of small-scale performance experiments, launch Extra-P, and compare the asymptotic or extrapolated performance of the worst instances to the expectations.
Extra-P generates not only a list of potential scalability bugs but also human-readable models for all performance metrics available such as floating-point operations or bytes sent by MPI calls that can be further analyzed and compared to identify the root causes of scalability issues.
Extra-P is developed by TU Darmstadt – in collaboration with ETH Zurich.
For questions regarding Extra-P please send a message to extra-p-support@lists.parallel.informatik.tu-darmstadt.de.
Table of Contents
Requirements
- Python 3.7 or higher
- numpy
- pycubexr
- marshmallow
- tqdm
- PySide2 (for GUI)
- matplotlib (for GUI)
- pyobjc-framework-Cocoa (only for GUI on macOS)
Installation
Use the following command to install Extra-P and all required packages via pip
.
python -m pip install extrap --upgrade
The --upgrade
forces the installation of a new version if a previous version is already installed.
Usage
Extra-P can be used in two ways, either using the command-line interface or the graphical user interface. More information about the usage of Extra-P with both interfaces can be found in the quick start guide.
Graphical user interface
The graphical user interface can be started by executing the extrap-gui
command.
Command line interface
The command line interface is available under the extrap
command:
extrap
OPTIONS (--cube
| --text
| --talpas
| --json
| --extra-p-3
) FILEPATH
You can use different input formats as shown in the examples below:
- Text files:
extrap --text test/data/text/one_parameter_1.txt
- JSON files:
extrap --json test/data/json/input_1.JSON
- Talpas files:
extrap --talpas test/data/talpas/talpas_1.txt
- Create model and save it to text file at the given path:
extrap --out test.txt --text test/data/text/one_parameter_1.txt
The Extra-P command line interface has the following options.
Arguments | |
---|---|
Positional | |
FILEPATH | Specify a file path for Extra-P to work with |
Optional | |
-h , --help |
Show help message and exit |
--version |
Show program's version number and exit |
--log {DEBUG , INFO , WARNING , ERROR , CRITICAL } |
Set program's log level (default: WARNING ) |
Input options | |
--cube |
Load data from CUBE files |
--text |
Load data from text files |
--talpas |
Load data from Talpas data format |
--json |
Load data from JSON or JSON Lines file |
--extra-p-3 |
Load data from Extra-P 3 experiment |
--scaling {weak , strong } |
Set weak or strong scaling when loading data from CUBE files (default: weak ) |
Modeling options | |
--median |
Use median values for computation instead of mean values |
--modeler {Default , Basic , Refining , Multi-Parameter } |
Selects the modeler for generating the performance models |
--options KEY=VALUE [KEY=VALUE ...] |
Options for the selected modeler |
--help-modeler {Default , Basic , Refining , Multi-Parameter } |
Show help for modeler options and exit |
Output options | |
--out OUTPUT_PATH |
Specify the output path for Extra-P results |
--print {all , callpaths , metrics , parameters , functions } |
Set which information should be displayed after modeling (default: all ) |
--save-experiment EXPERIMENT_PATH |
Saves the experiment including all models as Extra-P experiment (if no extension is specified, “.extra-p” is appended) |
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