Those numbers make the larger problem runtime suspect. How are you running
the Clojure version? With Lein?
On Wednesday, October 23, 2013, Paul Butcher wrote:
> On 22 Oct 2013, at 20:20, David Nolen
> <dnolen.li...@gmail.com<javascript:_e({}, 'cvml', 'dnolen.li...@gmail.com');>>
> wrote:
>
> On Tue, Oct 22, 2013 at 3:11 PM, Paul Butcher
> <p...@paulbutcher.com<javascript:_e({}, 'cvml', 'p...@paulbutcher.com');>
> > wrote:
>
>> Yeah - I have tried giving it more RAM without any effect on the timing
>> whatsoever. And I couldn't see the point of stopping people with less RAM
>> than that from being able to run it :-)
>>
>
> But without enough RAM most JVMs will thrash in GC when running that code.
>
>
> Yes, of course. But as I said, I tried giving it more RAM (the same 12G as
> the Scala solution) and it made no difference whatsoever. In fact, YourKit
> shows me that, even after running for an hour (i.e. more than 10x longer
> than the Scala version takes to return the full solution) the Clojure
> version is still using less than 2G. Whatever is going on, it's not a
> result of a lack of RAM.
>
> Saying both run in less than a second is not particularly informative for
> the small problems :) Does Scala take 4ms and Clojure takes 400ms on the
> small problems? That's a big difference.
>
>
> Yes, of course. But my experience with small problems has been that
> differences between execution time, especially when talking about runtimes
> as dissimilar as the Clojure and Scala runtimes, are meaningless. Those
> differences tend to have more to do with startup costs and the vagaries of
> when hotspot happens to optimise things than anything fundamental.
>
> But you asked, so here it is:
>
> For Clojure, the 3x3 problem takes 7ms and the 4x4 problem takes 78ms. For
> Scala, it's 15ms and 252ms respectively.
>
> --
> paul.butcher->msgCount++
>
> Snetterton, Castle Combe, Cadwell Park...
> Who says I have a one track mind?
>
> http://www.paulbutcher.com/
> LinkedIn: http://www.linkedin.com/in/paulbutcher
> MSN: p...@paulbutcher.com <javascript:_e({}, 'cvml',
> 'p...@paulbutcher.com');>
> AIM: paulrabutcher
> Skype: paulrabutcher
>
> On 22 Oct 2013, at 20:20, David Nolen
> <dnolen.li...@gmail.com<javascript:_e({}, 'cvml', 'dnolen.li...@gmail.com');>>
> wrote:
>
> On Tue, Oct 22, 2013 at 3:11 PM, Paul Butcher
> <p...@paulbutcher.com<javascript:_e({}, 'cvml', 'p...@paulbutcher.com');>
> > wrote:
>
>> Yeah - I have tried giving it more RAM without any effect on the timing
>> whatsoever. And I couldn't see the point of stopping people with less RAM
>> than that from being able to run it :-)
>>
>
> But without enough RAM most JVMs will thrash in GC when running that code.
>
> Saying both run in less than a second is not particularly informative for
> the small problems :) Does Scala take 4ms and Clojure takes 400ms on the
> small problems? That's a big difference.
>
> David
>
> --
> --
> 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<javascript:_e({}, 'cvml',
> '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 <javascript:_e({}, 'cvml',
> '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 <javascript:_e({}, 'cvml',
> '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<javascript:_e({}, 'cvml',
> '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 <javascript:_e({}, 'cvml',
> 'clojure%2bunsubscr...@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 <javascript:_e({}, 'cvml',
> 'clojure%2bunsubscr...@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.
