Section: New Results

Network Modeling

netloc (see Section 6.1) is a tool in hwloc to discover the network topology. Our first work with netloc was to redesign it to be more efficient and more adapted to the needs. The code was cleaned and some dependencies were removed. We have added a display tool, that is able to show a network topology in a web browser where a user can interact with. It ran on one of the largest European supercomputer (the TGCC/Genci CURIE machine) and successfully modeled its 5200 nodes and its interconnection network (more than 800 switches).

Moreover, it is now possible to interact with Scotch from netloc. The first feature is to export a network topology, or even the current available topology given by the resource manager, into a Scotch architecture. Conversely, we can use Scotch tools in netloc for building a process mapping based on resources found by netloc and a process graph describing communications between processes. Tests conducted on a stencil mini-app have shown that the benefits are real and still needs more work.