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Toward Replayable Research in Networking and Systems

Explore the importance of replayable research in networking and systems, emphasizing the need for repeatable experiments, encapsulated testbeds, and efficient experiment management systems like Emulab. Overcome challenges to replayability and enhance research practices. Visit http://www.emulab.net/ for more information.

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Toward Replayable Research in Networking and Systems

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  1. Toward Replayable Research in Networking and Systems Eric Eide eeide@cs.utah.edu University of Utah,School of ComputingMay 25, 2010

  2. “Replayable” Research • the goal of the networking and systems communities should be replayable research • repeatable • network testbeds • data repositories • experiment-management systems • replayable • fully encapsulated and easily re-executable

  3. Emulab • machines • 500+ PCs, and more • time- & space-shared • loads OS and software • network • config. topology & quality • services • file storage, email, … • available to researchers and educators worldwide

  4. Emulab Experiments expt. DB topology +SW (by reference) +events

  5. Resources Alone: Not Enough • testbeds give you lots of resources… • …but offer little help in using those resources • package / distribute / configure / instrument / init / execute / monitor / stop / collect / analyze / archive / revise / repeat

  6. a distributed, real-time application evaluate improvements to real-time middleware vs. CPU load vs. network load 4 research groups x 19 experiments x 56 metrics how to manage this? images → unmannedaerial vehicle alerts → receiver automatic targetrecognition ← images Example

  7. Needs • my experiment needs… • encapsulation • automation • instrumentation • preservation • benefits • verify previous results • establish base for new research • my own, or someone else’s package / distribute / configure / instrument / init / execute / monitor / stop / collect / analyze / archive / revise / repeat

  8. Emulab “Workbench” n = 4 n = 2 • an Emulab-integrated environment forreplayable research • expt. management • expt. execution • encapsulation • automation • output data capture • exploration • provenance • metadata

  9. Are We Replayable Yet? encapsulated expts + testbed = replay? + expt. DB

  10. Challenges to Replayability • packaging is still too hard • interactive use • capturing semantics & metadata • partly address “not worthwhile” perception

  11. Challenges to Replayability • external events & nondeterminism • cost of capture • need to replay even when experiment is modified

  12. Challenges to Replayability • long-term access to physical resources • physical devices needed by systems research • physical resources wear out [and/or lose funding] • virtualized resources • possible? useful?

  13. Challenges to Replayability • better definition of “replayable” • replayable with respect to chosen properties only • let experimenters be explicit about this • potential benefits • better design and instrumentation of expts • expts designed with replay in mind • separating what matters from accidental detail

  14. Summary • the goal of networking and systems researchers should be replayability • not just repeatable • also easily re-executable • challenges • easier packaging • designing experimentsfor replay & reuse

  15. http://www.emulab.net/ Thank you!Questions?

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