使用forEach和正则优化加速打印js对象

Question

通过使用{{goog.object/forEach}}，以及与正则检查的直接互操作，可以在1.14到1.77之间提高JavaScript对象的打印速度

Answer 1

评论者：mfikes

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加速总结

    Engine  small, medium, with sub-object
        V8: 1.42, 1.31, 1.19

SpiderMonkey: 1.14, 1.48, 1.41
JavaScriptCore: 1.48, 1.58, 1.62

   Nashorn: 1.27, 1.36, 1.20
ChakraCore: 1.49, 1.77, 1.77

之前

用V8进行基准测试
[obj (js-obj "a" 1 "b" 2)], (pr-str obj), 1000次运行，74毫秒
[obj (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str obj), 1000次运行，84毫秒
[sub-obj (js-obj "g" 7 "h" 8 "i" 9 "j" 10) obj (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" sub-obj)], (pr-str obj), 1000次运行，75毫秒

用SpiderMonkey进行基准测试
[obj (js-obj "a" 1 "b" 2)], (pr-str obj), 1000次运行，95毫秒
[obj (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str obj), 1000次运行，92毫秒
[sub-obj (js-obj "g" 7 "h" 8 "i" 9 "j" 10) obj (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" sub-obj)], (pr-str obj), 1000次运行，134毫秒

用JavaScriptCore进行基准测试
[obj (js-obj "a" 1 "b" 2)], (pr-str obj), 1000次运行，46毫秒
[obj (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str obj), 1000次运行，41毫秒
[sub-obj (js-obj "g" 7 "h" 8 "i" 9 "j" 10) obj (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" sub-obj)], (pr-str obj), 1000次运行，55毫秒

用Nashorn进行基准测试
[obj (js-obj "a" 1 "b" 2)], (pr-str obj), 1000次运行，1228毫秒
[obj (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str obj), 1000次运行，1048毫秒
[子对象 (js-obj "g" 7 "h" 8 "i" 9 "j" 10) 对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" 子对象)], (pr-str 对象), 1000 次运行，620 毫秒

使用 ChakraCore 进行基准测试
[对象 (js-obj "a" 1 "b" 2)], (pr-str 对象), 1000 次运行，55 毫秒
[对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str 对象), 1000 次运行，76 毫秒
[子对象 (js-obj "g" 7 "h" 8 "i" 9 "j" 10) 对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" 子对象)], (pr-str 对象), 1000 次运行，129 毫秒

之后

用V8进行基准测试
[对象 (js-obj "a" 1 "b" 2)], (pr-str 对象), 1000 次运行，52 毫秒
[对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str 对象), 1000 次运行，64 毫秒
[子对象 (js-obj "g" 7 "h" 8 "i" 9 "j" 10) 对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" 子对象)], (pr-str 对象), 1000 次运行，63 毫秒

用SpiderMonkey进行基准测试
[对象 (js-obj "a" 1 "b" 2)], (pr-str 对象), 1000 次运行，83 毫秒
[对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str 对象), 1000 次运行，62 毫秒
[子对象 (js-obj "g" 7 "h" 8 "i" 9 "j" 10) 对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" 子对象)], (pr-str 对象), 1000 次运行，95 毫秒

用JavaScriptCore进行基准测试
[对象 (js-obj "a" 1 "b" 2)], (pr-str 对象), 1000 次运行，31 毫秒
[对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str 对象), 1000 次运行，26 毫秒
[子对象 (js-obj "g" 7 "h" 8 "i" 9 "j" 10) 对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" 子对象)], (pr-str 对象), 1000 次运行，34 毫秒

用Nashorn进行基准测试
[对象 (js-obj "a" 1 "b" 2)], (pr-str 对象), 1000 次运行，970 毫秒
[对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str 对象), 1000 次运行，769 毫秒
[子对象 (js-obj "g" 7 "h" 8 "i" 9 "j" 10) 对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" 子对象)], (pr-str 对象), 1000 次运行，518 毫秒

使用 ChakraCore 进行基准测试
[对象 (js-obj "a" 1 "b" 2)], (pr-str 对象), 1000 次运行，37 毫秒
[对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6)], (pr-str 对象), 1000 次运行，43 毫秒
[子对象 (js-obj "g" 7 "h" 8 "i" 9 "j" 10) 对象 (js-obj "a" 1 "b" 2 "c" 3 "d" 4 "e" 5 "f" 6 "s" 子对象)], (pr-str 对象), 1000 次运行，73 毫秒
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Answer 2

评论者：mfikes

添加了 CLJS-2342-2.patch，该补丁基于当前主线版本重写。

Answer 3

评论者：mfikes

CLJS-2342-3.patch 重新基于当前主线版本。

Answer 4

评论者：mfikes

CLJS-2342-4.patch 重新基准线。

Answer 5

评论者：mfikes

CLJS-2342-4.patch 添加到补丁竞标（i）

Answer 6

评论者：mfikes

CLJS-2342-4.patch 通过 CI 和金丝雀测试 (/)

Answer 7

参考： https://clojure.atlassian.net/browse/CLJS-2342（由mfikes报告）