[SimGrid-user] Question regarding the network topology "FAT_TREE" and its topo_parameters

Ahmed Hamdy Mohamed Eleliemy ahmed.eleliemy at unibas.ch
Mon Oct 30 09:50:22 CET 2017

Dear users of SimGrid,

I have one concern regarding the use of the network topology “FAT_TREE” in the platform file.
According to the definition of the topo_parameters in the documentation  http://simgrid.gforge.inria.fr/simgrid/3.16/doc/classsimgrid_1_1kernel_1_1routing_1_1FatTreeZone.html , they follow this ordering
h ; m_h, ..., m_1 ; w_h, ..., w_1 ; p_h, ..., p_1
This ordering is reversed comparing to the working examples that are distributed with the SimGrid toolkit (see examples/platforms/cluster_fat_tree.xml), and it is also reversed comparing to the order mentioned in the following paper  https://webee.eedev.technion.ac.il/wp-content/uploads/2014/08/publication_574.pdf  which is h ; m_1, ..., m_h ; w_1, ..., w_h ; p_1, ..., p_h ( see section 2.B figure 1).

My question is which one is correct? Or do I misunderstand something?

Best regards

Ahmed Eleliemy
High Performance Computing Group
Mathematics and Computer Science Department
University of Basel
Spiegelgasse 1
CH-4051 Basel Switzerland
Phone: +41 (0)768232581

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