Section: New Results

Topology-aware ressource allocation

On the one hand SLURM already provides topology aware placement techniques to promote the choice of group of nodes that are placed on the same network level, connected under the same network switch or even placed close to each other so as to avoid long distance communications. On the other hand users can map tasks in a parallel application to the physical processors on the chosen nodes, based on the communication topology.

Our goal is to take in account, in SLURM, placement process, hardware topology, and application communication pattern too. We have implemented a new selection option for the cons_res plugin in SLURM 2.6.5. In this case the usually best fit algorithm used to choose nodes is replaced by Treematch, an algorithm to find the best placement among the free nodes list in light of a given application communication matrix. Tests and evaluation of this feature are in progress.