[jira] Created: (TS-398) Autoscaling threads vs Hyper Threading

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

Autoscaling threads vs Hyper Threading
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                 Key: TS-398
                 URL: https://issues.apache.org/jira/browse/TS-398
             Project: Traffic Server
          Issue Type: Improvement
          Components: Core
            Reporter: Leif Hedstrom
             Fix For: 2.3.0


On my home box, Linux reports real cores and Hyper Thread cores the same way (this has always been the case). While doing some benchmarks, I noticed even a "multiplier" of 2.0x for the number of worker threads is too much for optimal performance. In fact, on my box, a setting of 1.0x, yielding 8 worker threads, yielded optimal performance.

I think we might want to examine the CPU characteristics a little more careful, and not count Hyper Thread "cores" as real core, and adjust the number of worker threads only for real cores (or at least only give the HT cores "partial" credit).

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