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Top-Level Architecture
MWAX comprises 26 new servers and repurposes 10 of the existing servers on site at the MRO, occupying three racks. It makes use of the existing 100 Gbps fibre-optic link from site to the ten existing storage servers located in B206 on Curtin Campus. These ten servers will buffer MWA data pending transfer via a 100 Gbps fibre-optic link from B206 to the Pawsey Supercomputing Centre.
This configuration is capable of simultaneous fine channelization, cross-correlation, frequency/time averaging, and buffer storage for 256 tiles. In addition to the support for twice the inputs / four times the output visibilities, the MWAX correlator offers a number of improvements over the legacy system.
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The 24 coarse channels are processed by 24 GPU-accelerated compute nodes referred to as “MWAX Servers”, with two ‘hot spares’. Each MWAX Server implements the functions shown in the figure below. The real-time data flows on the MWAX Servers are managed through the use of input and output ring buffers that decouple its computational workflow from the input source and output destinations. These ring buffers are established and accessed using the open-source standard library “PSRDADA”ring buffer library “PSRDADA”.
The execution speed of MWAX is dependent on various parameter/configuration choices, but most significantly the number of tiles to correlate and the GPU hardware employed. For example, sustained real-time 256T correlation has been benchmarked successfully on a NVIDIA RTX2080Ti-based GPU card.
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