this is the python interface to iohexperimenter, which is the experimentation environment for iterative optimization heuristics (iohs). the source code of iohexperimenter is written in c++ and its python interface is realized using swig. iohexperimenter is a part of the bigger project called iohprofiler.

Accessing ioh

To load the module for ioh please use this command on the BEAR systems (BlueBEAR, BEARCloud VMs, and CaStLeS VMs):

module load bear-apps/2021b
module load ioh/

BEAR Apps Version




The listed architectures consist of two part: OS-CPU.

  • BlueBEAR: The OS used on BlueBEAR is represented by EL and there are several different processor (CPU) types available on BlueBEAR. More information about the processor types on BlueBEAR is available on the BlueBEAR Job Submission page.
  • BEAR and CaStLeS Cloud VMs: These VMs can have one of two OSes. Those with access to a BEAR Cloud or CaStLeS VM should check that the listed architectures for an application include the OS of VM being used. The VMs, irrespective of OS, will use the haswell CPU type.


  • ioh
  • xmltodict 0.13.0

More Information

For more information visit the ioh website.


This version of ioh has a direct dependency on: foss/2021b Ninja/1.10.2-GCCcore-11.2.0 Python/3.9.6-GCCcore-11.2.0 SciPy-bundle/2021.10-foss-2021b

Last modified on 22nd July 2022