Exploiting spatial parallelism in Ethernet-based cluster interconnects.

Stavros Passas, George Kotsis, Sven Karlsson, Angelos Bilas

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    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.
    Original languageEnglish
    Title of host publicationProceedings of Workshop on Communication Architecture for Clusters, CAC 2008
    PublisherIEEE Computer Society Press
    Publication date2008
    ISBN (Print)978-1-4244-1693-6
    Publication statusPublished - 2008
    Event22nd IEEE International Symposium on Parallel and Distributed Processing, IPDPS 2008 -
    Duration: 1 Jan 2008 → …


    Conference22nd IEEE International Symposium on Parallel and Distributed Processing, IPDPS 2008
    Period01/01/2008 → …


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