13-15 November 2018
America/Vancouver timezone

Scheduler task accounting for cgroups

14 Nov 2018, 09:00
15m
Pavillion-Ballroom-C (Sheraton Vancouver Wall Center)

Pavillion-Ballroom-C

Sheraton Vancouver Wall Center

58

Speaker

Tim Chen

Description

Cgroup accounting has significant overhead due to the need to constantly loop over all cpus to update statistics of cpu usages and blocked averages. We have seen that on 4 socket Haswell, database benchmarks like TPCC have 8% performance regression at the time of Haswell and 4.4 kernel when it is run under cgroup. On recent Cannon Lake platform using latest PCIE SSDs and 4.18 kernel, the regression in the scheduler has gotten worse to 12%. We will highlight the bottlenecks in the scheduler with detailed profiles of the hot path. We'll like to explore possible avenues to improve cgroup accounting.

Presentation Materials

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