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A Framework for Reliable Benchmarking and Resource Measurement

Build Status Code Quality Test Coverage Apache 2.0 License PyPI version DOI


  • We now provide an Ubuntu PPA that makes installing and upgrading BenchExec easier (docs).
  • BenchExec 2.3 produces improved HTML tables that load much faster and provide more features, subsequent versions improve these tables even further. if the tool cpu-energy-meter is installed on the system.
  • An extended version of our paper on BenchExec and its background was published in STTT, you can read the preprint of Reliable Benchmarking: Requirements and Solutions online. We also provide a set of overview slides.

BenchExec provides three major features:

  • execution of arbitrary commands with precise and reliable measurement and limitation of resource usage (e.g., CPU time and memory), and isolation against other running processes
  • an easy way to define benchmarks with specific tool configurations and resource limits, and automatically executing them on large sets of input files
  • generation of interactive tables and plots for the results

Contrary to other benchmarking frameworks, it is able to reliably measure and limit resource usage of the benchmarked tool even if it spawns subprocesses. In order to achieve this, it uses the cgroups feature of the Linux kernel to correctly handle groups of processes. For proper isolation of the benchmarks, it uses (if available) Linux user namespaces and an overlay filesystem to create a container that restricts interference of the executed tool with the benchmarking host. BenchExec is intended for benchmarking non-interactive tools on Linux systems. It measures CPU time, wall time, and memory usage of a tool, and allows to specify limits for these resources. It also allows to limit the CPU cores and (on NUMA systems) memory regions, and the container mode allows to restrict filesystem and network access. In addition to measuring resource usage, BenchExec can verify that the result of the tool was as expected, and extract further statistical data from the output. Results from multiple runs can be combined into CSV and interactive HTML tables, of which the latter provide scatter and quantile plots (have a look at our demo table).

BenchExec works only on Linux and needs a one-time setup of cgroups by the machine's administrator. The actual benchmarking can be done by any user and does not need root access.

BenchExec was originally developed for use with the software verification framework CPAchecker and is now developed as an independent project at the Software Systems Lab of the Ludwig-Maximilians-Universität München (LMU Munich).


License and Copyright

BenchExec is licensed under the Apache 2.0 License, copyright Dirk Beyer. Exceptions are some tool-info modules and third-party code that is bundled in the HTML tables, which are available under several other free licenses (cf. folder LICENSES).


Maintainer: Philipp Wendler


Users of BenchExec

BenchExec was successfully used for benchmarking in all instances of the international competitions on Software Verification and Software Testing with a wide variety of benchmarked tools and hundreds of thousands benchmark runs. It is integrated into the cluster-based logic-solving service StarExec (GitHub).

The developers of the following tools use BenchExec:

If you would like to be listed here, contact us.

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