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mfikes/perf.md

Last active April 16, 2019 20:46
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perf.md 
$ cat src/foo/core.cljs
(ns foo.core)

(prn (time (reduce + (map inc (map inc (range (* 1024 1024)))))))

$ clj -Sdeps '{:deps {org.clojure/clojurescript {:mvn/version "1.10.516"}}}' -m cljs.main -O advanced -c foo.core
$ node out/main.js
"Elapsed time: 151.000000 msecs"
549757386752

$ clj -Sdeps '{:deps {org.clojure/clojurescript {:mvn/version "1.10.439"}}}' -m cljs.main -O advanced -c foo.core
$ node out/main.js
"Elapsed time: 550.000000 msecs"
549757386752

This can be largely attributed to making the result of range implement the chunked seq abstraction.

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