The Euro-Par conference is a well-established venue for presenting and discussing research on parallel computing in Europe. In association with the Euro-Par 2020 conference, which takes place from August 24-28 in Warsaw, Poland, the workshop “PMACS – Performance Monitoring and Analysis of Cluster Systems” is organized by Thomas Gruber from our group. The workshop offers presentations and exchange of experience about various solutions on the collection, transmission, storage, evaluation, and visualization of runtime data about the hard- and software of whole cluster systems.