In this mail I'm talking about Clojure 1.4, however, I believe that the
issue persists in later versions, too.
I have quite a lot of code of the following form:
(defprotocol sum-proto
(sum [x y]))
(deftype Pair
[^long a ^long b]
sum-proto
(sum [x y]
(let [^Pair y y
new-a (+ (.a x) (.a y))
new-b (+ (.b x) (.b y))]
(Pair. new-a new-b))))
In real code there are *a lot* of implementations in that deftype generated
by macroses. The problem is that compilation time skyrocketed. Right now
I'm facing 5-10 seconds of compilation, which makes incremental development
very painful. Profiler shows that the overwhelming majority of this time is
spent here: [1]. It follows that the problem is in that ^Pair annotation:
when symbol is tagged by a symbol, it should be resolved as a class. It
should be way faster if I can "cache" that resolution, but I can't given
that those implementation are inside of deftype, I can't resolve in advance
the class that isn't defined. And I can't use extend-type either because of
the cost of extra var lookup.
The main question is: what can I do to make compilation faster?
Pre-resolving that class won't work, it seems.
[1]:
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Compiler.java#L986
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