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.
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