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Open|SpeedShop is a community effort by The Krell Institute with current direct funding from DOE’s NNSA and Office of Science. It is building on top of a broad list of community infrastructures, most notably Dyninst and MRNet from UW, libmonitor from Rice, and PAPI from UTK. Open|SpeedShop is an open source multi platform Linux performance tool which is targeted to support performance analysis of applications running on both single node and large scale IA64, IA32, EM64T, AMD64, PPC, Blue Gene and Cray platforms.

Open|SpeedShop is explicitly designed with usability in mind and is for application developers and computer scientists. The base functionality include:

  • Sampling Experiments
  • Support for Callstack Analysis
  • Hardware Performance Counters
  • MPI Profiling and Tracing
  • I/O Profiling and Tracing
  • Floating Point Exception Analysis

In addition, Open|SpeedShop is designed to be modular and extensible. It supports several levels of plug-ins which allow users to add their own performance experiments.

Open|SpeedShop development is hosted by the Krell Institute. The infrastructure and base components of Open|SpeedShop are released as open source code primarily under LGPL.


  • Comprehensive performance analysis for sequential, multithreaded, and MPI applications
  • No need to recompile the user’s application.
  • Supports both first analysis steps as well as deeper analysis options for performance experts
  • Easy to use GUI and fully scriptable through a command line interface and Python
  • Supports Linux Systems and Clusters with Intel and AMD processors
  • Extensible through new performance analysis plugins ensuring consistent look and feel
  • In production use on all major cluster platforms at LANL, LLNL, and SNL


  • Four user interface options: batch, command line interface, graphical user interface and Python scripting API.
  • Supports multi-platform single system image(SSI) and traditional clusters.
  • Scales to large numbers of processes, threads, and ranks.
  • Ability to automatically create and attach to both sequential and parallel jobs from within Open|SpeedShop.
  • View performance data using multiple customizable views.
  • Save and restore performance experiment data and symbol information for post experiment performance analysis
  • View performance data for all of application’s lifetime or smaller time slices.
  • Compare performance results between processes, threads, or ranks between a previous experiment and current experiment.
  • GUI Wizard facility and context sensitive help.
  • Interactive CLI help facility which lists the CLI commands, syntax, and typical usage.
  • Python Scripting API accesses Open|SpeedShop functionality corresponding to CLI commands.
  • Option to automatically group like performing processes, threads, or ranks.
  • Create traces in OTF (Open Trace Format).

How-To-Use Open|SpeedShop HPC-Admin Magazine Article

In this article, we will describe how to use Open|SpeedShop through step-by-step examples illustrating how to find a number of different performance bottlenecks. Additionally, we will describe the tool’s most common usage model (workflow) and provide several performance data viewing options.

See Look for Bottlenecks with Open|SpeedShop

New User Guide

We have begun the process of rewriting our Open|SpeedShop Users Guide. See the Documentation section of this web site and choose the Open|SpeedShop Version 2.0.2 Users Guide URL. The previous Users Guide is still available, re-labled as Previous/Old Users Guide. If you have comments and suggestions please contact us by emailing your comments to: oss-questions@krellinst.org. Thanks!

GPGPU performance analysis

We continue to work toward releasing a version of Open|SpeedShop that supports performance analysis of applications built with CUDA or OpenCL using NVIDIA GPUs. Availability will be shared here as we get closer to releasing this functionality.

Open|SpeedShop at SC13

Thanks to all that either stopped by the Open|SpeedShop booth (#3722) for a demonstration of Open|SpeedShop version 2.1 and/or attended our tutorial on Monday morning. It was great to talk with you! The tutorial slides have been posted at: http://www.openspeedshop.org/wp/category/tutorials.

SuperComputing 2012

Thanks for visiting our booth at SC2012 in Salt Lake City. It was good to meet with you. Please let us know your successes or if you are having any difficulties building or using Open|SpeedShop.

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