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?
>
> --
> --
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with your
> first post.
> To unsubscribe from this group, send email to
> clojure+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
> ---
> You received this message because you are subscribed to the Google Groups
> "Clojure" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to clojure+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/groups/opt_out.
>
>
--
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
