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From Phil Steitz <>
Subject Re: [math] nightly build failure
Date Thu, 04 Mar 2004 22:52:44 GMT

--- Phil Steitz <> wrote:
> Mark R. Diggory wrote:
> > Yes, unfortunately, this is a poor test which can fail randomly, it 
> > think it needs some more work so that it doesn't cause building to fail
> > when it does fail.
> As the output says, the test will fail with probability 1 in 1000, even
> if 
> there code is working properly.  What is being tested is the stochastic 
> independence of randomly generated hex strings, using a statistical test 
> (chi-square). I could
> (a) modify the test to just log / systout the anomoly instead of failing
> (b) remove this and other similar tests (bad idea, IMHO)
> (c) omit all of the tests from the build target used by the nightly build
> (what I was planning to do for gump eventually)
> (d) reduce the sensitivity of the test (so that is is, say 1 in 1000000 
> failure -- also a bad idea, IMHO)
> (e) don't worry, be happy, the build will succeed tomorrow :-)
> I guess that I favor (a) for the nightlies, but (c) for gump.
> Phil

Just had a better idea:

(f) repeat the test if it fails and "really" fail only if two consecutive
failures occur.  This will reduce the probability of a false failure to
miniscule without trashing sensitivity.  I will do this.

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