=> (def m {:x "a" :y 3})
#'runtime.q_test/m
=> (time (dotimes [n 10000000] (hash m)))
"Elapsed time: 154.650091 msecs"
nil
=> (time (dotimes [n 10000000] (hash m)))
"Elapsed time: 164.724641 msecs"
nil
=> (time (dotimes [n 10000000] (hash m)))
"Elapsed time: 150.194984 msecs"
nil
=> (time (dotimes [n 10000000] (hash {:x "a" :y 3})))
"Elapsed time: 57.981602 msecs"
nil
=> (time (dotimes [n 10000000] (hash {:x "a" :y 3})))
"Elapsed time: 70.803223 msecs"
nil
=> (time (dotimes [n 10000000] (hash {:x "a" :y 3})))
"Elapsed time: 67.395947 msecs"
nil
=> (def r (A. "a" 3))
#'runtime.q_test/r
=> (time (dotimes [n 10000000] (hash r)))
"Elapsed time: 4906.641334 msecs"
nil
=> (time (dotimes [n 10000000] (hash r)))
"Elapsed time: 4959.124395 msecs"
nil
=> (time (dotimes [n 10000000] (hash (A. "a" 3))))
"Elapsed time: 4842.496589 msecs"
nil
=> (time (dotimes [n 10000000] (hash (A. "a" 3))))
"Elapsed time: 4856.855515 msecs"
nil
On Sun, Feb 3, 2013 at 8:26 AM, AtKaaZ <atk...@gmail.com> wrote:
> he's in RC4
> => *clojure-version*
> {:major 1, :minor 5, :incremental 0, :qualifier "RC4"}
>
>
> => (time (dotimes [n 10000000] (hash {:x "a" :y 3})))
> "Elapsed time: 70.037502 msecs"
>
>
> => (time (dotimes [n 10000000] (hash (A. "a" 3))))
> "Elapsed time: 5307.93947 msecs"
>
>
> On Sun, Feb 3, 2013 at 8:22 AM, Leonardo Borges <
> leonardoborges...@gmail.com> wrote:
>
>> Are you running these in Clojure 1.5 RC-1 by any chance? That's when I
>> got results similar to yours.
>>
>> In Clojure 1.4, I get this:
>>
>> user> (time (dotimes [n 10000000] (hash {:x "a" :y 3})))
>> "Elapsed time: 5993.331 msecs"
>> nil
>> user> (time (dotimes [n 10000000] (hash (A. "a" 3))))
>> "Elapsed time: 3144.368 msecs"
>>
>> No clue as to the reason though - but it seems something might have
>> changed from 1.4 to 1.5?
>>
>>
>> Leonardo Borges
>> www.leonardoborges.com
>>
>>
>> On Sun, Feb 3, 2013 at 5:07 PM, Mark Engelberg <mark.engelb...@gmail.com>
>> wrote:
>> > I just went through the process of converting my map-based program over
>> to
>> > records, hoping it would improve speed. Much to my dismay, it actually
>> > slowed my program down substantially. With some profiling, I discovered
>> > that one possible explanation is that (at least in RC4) hashing of
>> records
>> > is about 60x slower than their map-based counterpart.
>> >
>> > (defrecord A [x y])
>> > => (time (dotimes [n 10000000] (hash {:x "a" :y 3})))
>> > "Elapsed time: 90.631072 msecs"
>> > => (time (dotimes [n 10000000] (hash (A. "a" 3))))
>> > "Elapsed time: 5549.788311 msecs"
>> >
>> > Any thoughts about why this is the case?
>> >
>> > --
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>
>
> --
> Please correct me if I'm wrong or incomplete,
> even if you think I'll subconsciously hate it.
>
>
--
Please correct me if I'm wrong or incomplete,
even if you think I'll subconsciously hate it.
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