Dear Dorian, since nobody has responded so far: I understand the issue, but firstly, I want to remind that we also wanted to use the IO-500 to bound the possible performance for users. Hence, a value that cannot be achieved possibly by any users is not achieving this goal. Regardless of how to compute a single value for a single data center, I propose, you run the benchmark on each supercomputer independently, anyway that would be a good values to have! There are several options: 1) best would be (of course) you manage to run the benchmark across supercomputers 2) you ignore the one io500 value as we will have the value soon in the comprehensive data center list, which allows to aggregate performance of a site using various metrics to accompany individual needs. 3) running two benchmark instances concurrently for an extensive time, synchronized. This could be done by extending the benchmark script to e.g., pause until the other part is done communicating via the files. However, the resulting value would not be exactly what is the purpose of the benchmark as the phase out will be different. What would be happening if people then say, well I run this for every node independently! It won`t be the same. Still, I would be interested to see what the result of 3) would be and willing to help you to change the script(s). I could imagine there is a list that contains such results / or we integrate it into the default list but mark it clearly. It all depends from the actual achieved results and how much *cheating* we would see. Hence, if you imagine this is good, why not do all three things! The next BoF at SC you could present your results and we could continue the discussion based on the results. Regards, Julian 2018-06-29 20:33 GMT+01:00 Dorian Krause <d.krause(a)fz-juelich.de&gt;: -- Dr. Julian Kunkel Lecturer, Department of Computer Science +44 (0) 118 378 8218 http://www.cs.reading.ac.uk/ https://hps.vi4io.org/