[GHC] #8173: GHC uses nub

[Muhaimin Ahsan]

Kim-Ee,

The updated fib-analyse report from a few hours ago is posted here: https://gist.github.com/leroux/6725810#file-headvordnub-analysis-L2988
Comment (http://ghc.haskell.org/trac/ghc/ticket/8173#comment:9)

Sorry for the misunderstanding.

Muhaimin

On Sep 27, 2013, at 3:56 PM, Kim-Ee Yeoh <ky3 at atamo.com> wrote:

> 
> On Fri, Sep 27, 2013 at 8:14 PM, GHC <ghc-devs at haskell.org> wrote:
> A 5% improvement in compile time is remarkable, if it's true.  Great!  But
>  I'm always worried about the noise in compile times measured in seconds.
> 
> Does anyone else think the noise in runtimes is alarming considering that the following is the fib-analysis of /binary-identical/ programs? 
> 
> >              Min          -0.1%     -0.0%    -25.4%    -32.2%     -1.3%
> >             Max          +0.1%     +0.0%    +19.0%    +22.2%    +10.0%
> 
> Shouldn't we find an explanation for this before believing the compile time numbers? What would cause these wide swings on the benchmarking machine?
> 
> p.s. For the record: Should do more rigorous statistical testing instead of naive percentages, yes?
> 
> -- Kim-Ee
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