[Development] results of July flaky tests fixing

Thiago Macieira thiago.macieira at intel.com
Thu Sep 1 14:12:13 CEST 2022

On Thursday, 1 September 2022 06:28:55 -03 Volker Hilsheimer wrote:
> * stress tests for data races: if your test doesn’t expose any race
> conditions if you run with QThread::idealThreadCount threads, then it’s
> unlikely that it will expose races if you run with more threads. But with
> time sharing, the threads might run a lot longer than you expect. See e.g.
> https://codereview.qt-project.org/c/qt/qtbase/+/421391

Also, be careful with scaling. If your code has quadratic scaling, 8 cores 
isn't twice as bad as 4 cores, compared to 2; it's actually 16x worse. And if 
I run on 48 cores on a 2-socket NUMA system, it's 576x worse. Or worse.

Thiago Macieira - thiago.macieira (AT) intel.com
  Cloud Software Architect - Intel DCAI Cloud Engineering

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