[swift-dev] Very slow Set<String>(arrayOfStrings) for some arrayOfStrings

[Jens Persson]

Thanks, but I'll have to invite anyone with more time and experience to do
that.

One (of many) thing(s) I wouldn't know how include/handle is the 1.3 MB
text file for the particular arrayOfStrings that makes Set(arrayOfStrings)
slow. It seems a bit unnecessary/bloating to put it in the code base.

/Jens

On Tue, Mar 1, 2016 at 11:58 PM, Nadav Rotem <nrotem at apple.com> wrote:

> Hi Jens,
>
> Thanks for reporting this issue. I don’t know what’s going on but we’ll
> take a look.
>
> I think it would be great if you could add this program as a benchmark
> under swift/benchmarks/.  This will allow us to track the performance of
> this test and ensure that we don’t regress.
>
> Thanks,
> Nadav
>
> On Mar 1, 2016, at 5:01 AM, Jens Persson via swift-dev <
> swift-dev at swift.org> wrote:
>
> For some particular arrays of strings, creating a
> Set<String>(arrayOfStrings) takes about 100 to 200 times longer than for
> other very similar arrays of strings (equally many unique simple [a-zA-Z ]+
> strings).
>
> I've put together a tiny program to demonstrate the problem here:
>
> http://sloppyfocus.com/slowSetFromParticularButSeeminglyNormalArrayOfStrings.html
>
> Is this due to a bug / performance problem in Set or can it be explained
> (and solved) in some way?
>
> /Jens
>
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>


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