Proposal: Further performance improvements of Data.Map

[Milan Straka]

Hi,

> Great!
> 
> I don't understand what this means, though:
> 
> > On i386 Intel Core2 and GHC 6.12.1, the improvements are
> >
> > alter                       5.61
> > delete                      10.80
> > difference                  20.33
> > insert                      8.09
> > intersection                7.69
> > union                       21.74
> > update                      7.96
> 
> What are the units on those numbers? What tests were performed to achieve them?

Sorry, I forgot to add the percent sign. The improvements are in %.
I used the benchmarks which are part of the patches (the ones used in
4277).

Cheers,
Milan

> 
> Jim
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