On Wed, Dec 29, 2010 at 12:27 AM, Mark Engelberg <[email protected]>wrote:
> Clearly, I couldn't really answer that question without doing some > investigating to see what the speed difference is like. I was even > hoping that if the speed difference were small enough, I could bundle > up a little library that implements HashMap as a Clojure hash map in > an atom, so that my Java pals could start using Clojure's hash maps as > a drop-in replacement for Java's (that's where the gen-class piece of > the experiment comes in). But with a 10x speed difference and so much > more memory churn, I think that's going to be a tough sell. It's > possible that Clojure becomes more competitive with Java under a lot > of contention for access from different threads, but I haven't tested > that out yet. > > Anyway, thanks for confirming that the ratio of speeds on your machine > are similar to mine. Even in in a single threaded context raw insert performance isn't the final word. What if you want to be able to deliver a snapshot for reporting? In Clojure that's free. In Java that's a blocking copy of a HashMap with 1e5 keys. Ick. That's the problem with naive benchmarks. They only sound good until you have to write real programs that do real work. David -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en
