Section: New Results

Network Modeling

netloc (see Section 6.3) is a tool in hwloc to discover the network topology. The information gathered and analysed are now saved in XML format. It brings more flexibiliy, readability and compatibility. Henceforth, in the display tool, we compute the positions of the nodes rather than use physics algorithm provided by vis.js library for node placement. Thus, it makes the visualization faster and we can display a fat-tree with around 41k nodes in less than 1 second.

Moreover, we can deal with other kinds of topologies. We handle topologies in a generic way and can have nested topologies. For the mapping, we build a deco graph in Scotch . Consequently, the mapping will be possible for any architecture. [17]

We have also optimized the mapping by giving a preconditioned matrix to Scotch , and by computing some metrics in order to evaluate mappings and keep the best one.

The part about discovering network have been improved and we support now, in addition to Infiniband, Omnipath fat-trees, Cray Torus.