On Dec 28, 10:28 pm, Mark Engelberg <mark.engelb...@gmail.com> wrote:
> On Tue, Dec 28, 2010 at 10:15 PM, David Nolen <dnolen.li...@gmail.com> wrote:
> > 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?
>
> What if you don't?
Use transients?
(dotimes [_ 10]
(let [m (atom (transient {}))
r (range 1e5)]
(time
(doseq [i r]
(swap! m assoc! i 2)))))
is within 50% the speed of an ordinary java.util.HashMap, by my
measurements. And if you want snapshots at every step, in the worst
case you pay the price you've measured above.
-Jason
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