Java BitSet performance-flicker mystery

Re:Java BitSet performance-flicker mystery by Snoozus on Saturday February 05, 2022 @06:36PM (#30227540)

Would love to reproduce this, please post the full specs of the machine and os!

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Re:Java BitSet performance-flicker mystery by cospaia on Saturday February 05, 2022 @07:01PM (#30227721)

This machine https://www.dustin.se/product/5011255694/mini-pc-pn51

Ubuntu, latest LTS.

I bought the machine for this purpose. Guessing it was sufficiently similar to the machines running the benchmarks where I stumbled across the issue: https://plummerssoftwarellc.github.io/PrimeView/?rc=30&sc=dt...

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Re:Java BitSet performance-flicker mystery by rocketChair on Sunday February 06, 2022 @04:25AM (#30230809)

Am I reading this right, you bought a €730 machine just to investigate why 20 lines of code occasionally runs slow?

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Re:Java BitSet performance-flicker mystery by cospaia on Sunday February 06, 2022 @05:22AM (#30231145)

Haha, yes, you are reading correctly. To clarify: my employer bought the machine for me to have for this purpose. They know how grumpy I get with unsolved mysteries.

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Re:Java BitSet performance-flicker mystery by exikyut on Sunday February 06, 2022 @06:56AM (#30231723)

[Many unhappily employed engineers] would like to know your location

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Re:Java BitSet performance-flicker mystery by jstaph on Sunday February 06, 2022 @08:38AM (#30232369)

AMD Ryzen 9 5900X - 64GB PC4-28800 C18

Every run passed through a different core.

  0 - Passes: 5970, count: 78498, Valid: true
  1 - Passes: 5768, count: 78498, Valid: true
  2 - Passes: 5763, count: 78498, Valid: true
  3 - Passes: 5762, count: 78498, Valid: true
  4 - Passes: 5812, count: 78498, Valid: true
  5 - Passes: 5743, count: 78498, Valid: true
  6 - Passes: 5721, count: 78498, Valid: true
  7 - Passes: 5737, count: 78498, Valid: true
  8 - Passes: 5754, count: 78498, Valid: true
  9 - Passes: 5768, count: 78498, Valid: true

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Re:Java BitSet performance-flicker mystery by cospaia on Sunday February 06, 2022 @11:43AM (#30234141)

What is meant by that the runs are passed through a different core?

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