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Introduce rate based fluid flow wan workload - #269
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sanjaychari wants to merge 8 commits into
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sanjaychari wants to merge 8 commits into
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FYI @carothersc-zz @caitlinross @kevinabrown, this implements the rate-based fluid flow logic we discussed. I validated it analytically and against SimGrid, which is a simpler analytical flow simulator, and it is working as expected. You can find all the experiments I ran here[1]. [1] https://github.com/sanjaychari/fluid-flow-wan-experiments |
Add an independent upstream offer rate to prevent downstream switches from reserving excess bandwidth for flows constrained by upstream contention. - Compute upstream offers independently of downstream feedback. - Propagate offers through FLOW_REGISTER and DATA_RATE_UPDATE. - Trigger updates when upstream offers change, even if actual transmission rates remain unchanged. - Preserve existing event semantics and PAUSE/RESUME behavior. - Include new allocation state in reverse computation.
Improve distributed max-min allocation to prevent upstream-constrained flows from reserving excess bandwidth on downstream links. - Propagate upstream offers independently of actual transmission rates. - Account for upstream constraints when allocating outgoing bandwidth. - Compute counterfactual feedback rates to avoid reflecting upstream restrictions back as downstream bottlenecks. - Eliminate unnecessary feedback round trips during rate recovery. - Preserve existing PAUSE/RESUME and buffer management behavior.
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This PR introduces a workload that simulates WAN traffic as a series of user defined fluid flows through the network. The simulation currently supports Ethernet-based links, and implements max-min analytical flow rate limiting with switch buffer threshold-based PAUSE mechanisms.
It has been tested and validated against SimGrid's[1] raw analytical network simulator.
[1] https://simgrid.org/