I don't think this particular example relates.
Memoize produces a function, so the time spent is really about hashing
functions which presumably hashes on the address of the function (or
something similar) and never touches the underlying record.
In the later example, you are mostly timing the cost of repeatedly
memoizing, which creates a lot of anonymous functions, and would be
expected to be more time-consuming.
The other examples you posted are interesting, though.
On Sat, Feb 2, 2013 at 11:31 PM, AtKaaZ <atk...@gmail.com> wrote:
> ok i like this variant:
> => (def r (memoize (A. "a" 3)))
>
> #'runtime.q_test/r
> => (time (dotimes [n 10000000] (hash r)))
> "Elapsed time: 342.363961 msecs"
>
> nil
> => (time (dotimes [n 10000000] (hash r)))
> "Elapsed time: 361.66747 msecs"
> nil
>
> => (time (dotimes [n 10000000] (hash (memoize (A. "a" 3)))))
> "Elapsed time: 1812.016478 msecs"
> nil
> => (time (dotimes [n 10000000] (hash (memoize (A. "a" 3)))))
> "Elapsed time: 1847.244062 msecs"
> nil
>
>
>
>
> On Sun, Feb 3, 2013 at 8:29 AM, AtKaaZ <atk...@gmail.com> wrote:
>
>> => (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.
>>
>>
>
>
> --
> Please correct me if I'm wrong or incomplete,
> even if you think I'll subconsciously hate it.
>
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