Virtual NR Routing #380
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Virtual NR Routing #380
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…h an environment variable to control the number of ranks assigned to a virtual node for use in routing calculations
* adds back in more comm tests to more thoroughly test VIRTUAL_NR routing
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@rogerpearce Is this what you had in mind? |
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Adds virtual NR routing scheme that functions similarly to NR but with an environment variable to control the number of ranks assigned to a virtual node for use in routing calculations.
This is enabled and controlled by setting the
YGM_COMM_ROUTING" environment variable to "VIRTUAL_NR", and then settingYGM_COMM_VIRTUAL_NODE_SIZE` to the desired number of ranks to consider to be on the same node when performing routing calculations.This routing scheme does not use any information about the mapping of ranks to compute nodes when determining which ranks get assigned to the same virtual node. Ranks are assigned block-cyclically according to their ID.
To get access to the new
YGM_COMM_VIRTUAL_NODE_SIZEenvironment variable, thecomm_routerobject needs to be given access to thecomm_environmentvariable set up by thecomm.