High dTLB miss rate in feedsim

facebookresearch / DCPerf

DCPerf benchmark suite for hyperscale cloud applications

MIT License

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High dTLB miss rate in feedsim #22

Closed excelle08 closed 2 years ago

excelle08 commented 2 years ago

Problem statement: The feedsim benchmark has a dTLB miss rate of around 10~11 MPKI, which is 10x higher than the production feed workload.

excelle08 commented 2 years ago

We tried Transparent Huge Page to lower the dTLB miss rate of feedsim to less than 1 MPKI, but experienced performance degradation instead of QPS boost. We believe this means trying to reduce the dTLB miss will not provide significant improvement in performance. Besides, high dTLB miss is expected in graph workloads. Therefore, we decide to move on and keep the behavior as is.