[ltt-dev] [UST PATCH] TESTS: Add a delay at the start of the fork test for a more uniform testing.

Mathieu Desnoyers compudj at krystal.dyndns.org
Wed Feb 23 10:45:51 EST 2011

* Yannick Brosseau (yannick.brosseau at gmail.com) wrote:
> >>>>         
> >>> I'm afraid we're falling into a bit of a trap here. The trap is called
> >>> "fixing the test-case instead of fixing the code". It's quite typical
> >>>     
> >> No that's not the case here. I'm fixing the test case, so it shows us a
> >> problem that was occuring randomly before.
> >> With my "fix" to the test case, the test case will fail all the time and
> >> showing us the problem when we fork later. (Some application do it, so
> >> UST should not fail there)
> >>   
> > So you're saying that this causes the test case to fail all the time
> > because now we leave time for things to properly initialise, while if
> > we don't initialise things sometimes work?
> > I think I understand what you mean but I still don't agree. What about
> > making sure somehow that we are fully initialized before we hit
> > main()? In the case where we are tracing from startup using usttrace
> > we should in fact be fully initialised before we allow the program to
> > enter main.
> >
> > If you don't think we should be fully initialized before entering
> > main() please explain why.
> I have no real opinion on the initialization, I don't have enough
> knowledge about it right now.
> But I see no real needs for the consumerd to be started before we start
> main. I can imagine cases where we want to get to main the fastest way
> possible and leave the unnecessary things for later.
> That being said, my goal right now it to get a test suite that do useful
> tests and can identify problems and the change I propose to the test are
> finding problems.
> Also, if we decide that we need to be fully initialized, we will need to
> write a test case that can test that.

Exactly. I think we need to test:

- case where app is started slightly before consumerd
- case where app is started after consumerd



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Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.

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