Ein Großgerät für die Forschung : Hochleistungsrechnen auf der magnitUDE

Die technischen Daten und das „Drumherum“ des Wissenschaftlichen Rechnens mit der magnitUDE thematisiert dieser Text des Supportteams des High-Performance Computings an der UDE.
In 2010 the first supercomputer CRAY XT6m at the UDE was brought into service. Four years later the demand on HPC-resources at the UDE has been increased eminently. Thus, in 2014 the UDE applied successfully under the supervision of the CCSS for the financial support of a new, more powerful supercomputer. With the grant of 3.3 million € from the German Research Council in 2015, the supercomputer magnitUDE was purchased from NEC and installed in the first half of 2016; it reached rank 279 in the TOP 500 of HPC ranking. Now, nine months into operation, we can state that the process to setup a wellworking HPC-system satisfying the demands of all researchers was not as simple as it might look. The first crucial part was the definition of the technical criteria for the tender, since they constrain the framework of possible configurations for the potential vendors. In this context the measurement of the performance was defined and a suitable testmatrix of typical applications of prospective usergroups was composed. Concurrently, the search for a suitable location for magnitUDE had to be started, since the resources at both UDE-campi were not valid or exhausted. Finally, the UDE rented a new DataCenter in the logport Duisburg- Rheinhausen, which will host further IT-infrastructure of the ZIM as well. Obviously, the parallel establishment of the technical criteria and the location authored a few dilemmas, e.g. expectable power consumption. After the installation another two essential aspects had to be decided: the scheduling policy for the computations and the usage policy. A combination of fairshare and backfilling strategy was selected to weight the resource usage by the usergroup and take into account the scaling ability of their applications. Until now this decision has shown a good exploitation of magnitUDE. To ensure a robust operation the definition of user-specific disk quota and respites of file age were established in the usage policy as well. Right at the beginning of the installation the first extension of magnitUDE was planned and, thus, early in 2017 additional 60 compute nodes were added. With this extension magnitUDE will hopefully still be part of the TOP 500 rankings in 2017/18. In conclusion, the magnitUDE enables the researchers of the UDE to improve and demonstrate the performance of their computational applications. This opportunity has not been locally available to the researchers before and so is a new resource in the field of HPC at the UDE.
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