Section: New Results

Scalable Management of Platform Topologies

hwloc (see Section 6.2) is used for gathering the topology of computing nodes. Those nodes are now growing to hundreds of cores, making the overall amount of topology information non-negligible. We studied the overhead of topology discovery on the overall execution time and showed that the Linux kernel is bottleneck on large nodes. It raised the need to use exported and/or abstracted topologies to factorize this overhead [22].

The memory footprint of locality information is also becoming an issue on large many-core. We designed a way to share this information between processes inside nodes so as to factorize this memory consumption [45].