On 05 Mar 2014, at 09:32, Rutledge Shawn <shawn.rutle...@digia.com> wrote:

> Sometimes though, we try to fix the autotests that fail the most frequently.  
> If you can't reproduce the failure on your own machine, with the same OS, 
> often the cause seems to be heavy multi-tasking on the CI machines, which 
> will slow down timing-sensitive tests to the point of failure.  But even that 
> is hard to prove, since CI is a black box to most of us; and even if you get 
> access to a CI machine to run tests on, they won't fail because it's not 
> multi-tasking so heavily at that time.

A virtual machine with very limited resources can often reproduce such test 
failures. At least VBox lets you change CPU execution cap while the virtual 
machine is running.

--
J-P Nurmi

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