Out of interest, I ran the benchmarks as is, and got more or less the same
results - 15x. Then I tried upgrading the defun dependencies - clojure,
core.match and tools.macro - all of which have newer versions, and then running
the benchmarks without leiningen’s jvm-opts and in a trampolined repl. The
results are better (see below). Still not great - but down from 15x to 10x.
That said:
* I’m not sure I’d care: for most applications the overhead of function
dispatch is probably not the bottleneck.
* Elixir and the BEAM VM are awesome at many things, but I suspect (from
experience not evidence) that the defun version is still faster than the elixir
version.
Rob
---
user=> (bench (accum-defn 10000))
WARNING: Final GC required 2.590098761776679 % of runtime
Evaluation count : 429360 in 60 samples of 7156 calls.
Execution time mean : 139.664539 µs
Execution time std-deviation : 4.701755 µs
Execution time lower quantile : 134.451108 µs ( 2.5%)
Execution time upper quantile : 150.214646 µs (97.5%)
Overhead used : 1.565276 ns
Found 5 outliers in 60 samples (8.3333 %)
low-severe 5 (8.3333 %)
Variance from outliers : 20.5880 % Variance is moderately inflated by outliers
user=> (bench (accum-defun 10000))
Evaluation count : 44940 in 60 samples of 749 calls.
Execution time mean : 1.361631 ms
Execution time std-deviation : 40.489537 µs
Execution time lower quantile : 1.333474 ms ( 2.5%)
Execution time upper quantile : 1.465123 ms (97.5%)
Overhead used : 1.565276 ns
Found 9 outliers in 60 samples (15.0000 %)
low-severe 1 (1.6667 %)
low-mild 8 (13.3333 %)
Variance from outliers : 17.3434 % Variance is moderately inflated by outliers
---
> On 5 Sep 2015, at 05:16, Amith George <[email protected]> wrote:
>
> Nice. Hadn't heard of it before. It looks interesting. The criterium
> benchmark is kinda disappointing though. The pattern matched function took
> nearly 15x the time of the normal function.
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