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Cube GUI User Guide
(CubeGUI 4.8.2, revision 7895e762)
Introduction in Cube GUI and its usage
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Communication Efficiency (CommE) is the maximum across all processes of the ratio between useful computation time and total run-time:
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CommE identifies when code is inefficient because it spends a large amount of time communicating rather than performing useful computations. CommE is composed of two additional metrics that reflect two causes of excessive time within communication:
These are measured using Serialisation Efficiency and Transfer Efficiency. Combination of these two sub-metrics gives us Communication Efficiency:
To obtain these two sub-metrics we need to perform Scalasca trace analysis which identifies serialisations and inefficient communication patterns.
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