Confirmed. I am looking into this. For some reason the call to filter is
reflective in alpha 2.
> Could someone else also try the sample code I included to see if they
> also experience the same ~10x slowdown for (count (filter ...)) in 1.3
> Alpha 2?
>
> On Oct 28, 12:34 pm, Btsai <benny.t...@gmail.com> wrote:
>> I have some code that counts the elements in a list that map to true
>> in a lookup table, looking something like this:
>>
>> (def lookup-table {1 true, 2 false})
>> (def elements (range 1000000))
>> (count (filter lookup-table elements))
>>
>> On my machine, with server mode enabled, the count + filter got ~10
>> times slower when I updated from 1.3 Alpha 1 to 1.3 Alpha 2:
>>
>> (Alpha 1)
>> user=> (time (count (filter lookup-table elements)))
>> "Elapsed time: 181.262702 msecs"
>> 1
>>
>> (Alpha 2)
>> user=> (time (count (filter lookup-table elements)))
>> "Elapsed time: 2017.744155 msecs"
>> 1
>>
>> Which is weird because looking up elements in the table did not become
>> any slower:
>>
>> (Alpha 1)
>> user=> (time (doseq [x elements] (lookup-table x)))
>> "Elapsed time: 159.033341 msecs"
>> nil
>>
>> (Alpha 2)
>> user=> (time (doseq [x elements] (lookup-table x)))
>> "Elapsed time: 159.965861 msecs"
>> nil
>
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