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Exploiting spatial parallelism in Ethernet-based cluster interconnects

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4 Author(s)
Passas, S. ; Inst. of Comput. Sci., Found. for Res. & Technol., Heraklion ; Kotsis, G. ; Karlsson, S. ; Bilas, A.

In this work we examine the implications of building a single logical link out of multiple physical links. We use MultiEdge to examine the throughput-CPU utilization tradeoffs and examine how overheads and performance scale with the number and speed of links. We use low- level instrumentation to understand associated overheads, we experiment with setups between 1 and 8 1-GBit/s links, and we contrast our results with a single 10-GBit/s link. We find that: (a) Our base protocol achieves up-to 65% of the nominal aggregate throughput, (b) Replacing the interrupts with polling significantly impacts only the multiple link configurations, reaching 80% of nominal throughput, (c) The impact of copying on CPU overhead is significant, and removing copying results in up-to 66% improvement in maximum throughput, reaching almost 100% of the nominal throughput, (d) Scheduling packets over heterogeneous links requires simple but dynamic scheduling to account for different link speeds and varying load.

Published in:

Parallel and Distributed Processing, 2008. IPDPS 2008. IEEE International Symposium on

Date of Conference:

14-18 April 2008

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