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

[Jens Persson]

I guess it would be possible to isolate the problem by analyzing my
example, and thereby making it possible to write a smaller benchmark which
doesn't need that big textfile. I didn't manage to do that however, hence
my question about the problem here.
/Jens

On Wed, Mar 2, 2016 at 9:11 AM, Jens Persson <jens at bitcycle.com> wrote:

> 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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>>
>>
>>
>
>
> --
> bitCycle AB | Smedjegatan 12 | 742 32 Östhammar | Sweden
> http://www.bitcycle.com/
> Phone: +46-73-753 24 62
> E-mail: jens at bitcycle.com
>
>


-- 
bitCycle AB | Smedjegatan 12 | 742 32 Östhammar | Sweden
http://www.bitcycle.com/
Phone: +46-73-753 24 62
E-mail: jens at bitcycle.com
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