Strategy: Taming Linux Scheduler Jitter Using CPU Isolation and Thread Affinity
Wednesday, September 30, 2015 at 8:56AM
Todd Hoff in Strategy

When nanoseconds matter you have to pay attention to OS scheduling details. Mark Price, who works in the rarified high performance environment of high finance, shows how in his excellent article on Reducing system jitter.

For a tuning example he uses the famous Disrupter inter-thread messaging library. The goal is to keep the OS continuously feeding CPUs work from high priority threads. His baseline test shows the fastest message is sent in 76 nanoseconds, 1 in 100 messages took longer than 2 milliseconds, and the longest delay was 11 milliseconds.

The next section of the article shows in loving detail how to bring those latencies lower and more consistent, a job many people will need to do in practice. You'll want to read the article for a full explanation, including how to use perf_events and HdrHistogram. It's really great at showing the process, but in short:

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