fast-zip

A modified version of clojure.zip that uses deftype internally and is written in CLJX format.

Usage

[fast-zip "0.6.1"]

This is a drop in replacement for clojure.zip. Simply require fast-zip.core instead of clojure.zip.

Benchmark

Since 0.6.1 a benchmark run consists of two analysis goals:

1. "walk" traverses a vector zip of three levels of ints and sums the numbers (reduction over leaves)
2. "edit" same setup as for "walk", but actually edits each leaf (* n 10) and applies all changes at the end

The current snapshot version of this lib is roughly twice as fast as the 0.5.2 release...

Historical benchmarks for each version

Clojure

To run, use lein perforate.

WARNING: Final GC required 2.904199000536039 % of runtime
Goal:  Benchmark vector zip edit.
-----
Case:  :fast-zip
Evaluation count : 96600 in 60 samples of 1610 calls.
             Execution time mean : 613.696756 µs
    Execution time std-deviation : 23.370402 µs
   Execution time lower quantile : 588.826153 µs ( 2.5%)
   Execution time upper quantile : 687.558243 µs (97.5%)
                   Overhead used : 2.997006 ns

Found 3 outliers in 60 samples (5.0000 %)
	low-severe	 3 (5.0000 %)
 Variance from outliers : 23.8777 % Variance is moderately inflated by outliers

Case:  :clojure.zip
Evaluation count : 27420 in 60 samples of 457 calls.
             Execution time mean : 2.143100 ms
    Execution time std-deviation : 55.341182 µs
   Execution time lower quantile : 2.046640 ms ( 2.5%)
   Execution time upper quantile : 2.248948 ms (97.5%)
                   Overhead used : 2.997006 ns

Goal:  Benchmark vector zip walk.
-----
Case:  :fast-zip
Evaluation count : 578700 in 60 samples of 9645 calls.
             Execution time mean : 106.602340 µs
    Execution time std-deviation : 3.705304 µs
   Execution time lower quantile : 101.726377 µs ( 2.5%)
   Execution time upper quantile : 117.508157 µs (97.5%)
                   Overhead used : 2.997006 ns

Found 5 outliers in 60 samples (8.3333 %)
	low-severe	 2 (3.3333 %)
	low-mild	 3 (5.0000 %)
 Variance from outliers : 20.6548 % Variance is moderately inflated by outliers

Case:  :clojure.zip
Evaluation count : 46020 in 60 samples of 767 calls.
             Execution time mean : 1.326133 ms
    Execution time std-deviation : 32.156029 µs
   Execution time lower quantile : 1.262908 ms ( 2.5%)
   Execution time upper quantile : 1.387965 ms (97.5%)
                   Overhead used : 2.997006 ns

Found 1 outliers in 60 samples (1.6667 %)
	low-severe	 1 (1.6667 %)
 Variance from outliers : 12.5459 % Variance is moderately inflated by outliers

ClojureScript

For the clojurescript version, make sure you have node.js installed along with the benchmark NPM module. Then use lein clean-bench

Benchmark: vector zip walk...
:clojure.zip.walk x 69.52 ops/sec ±3.58% (67 runs sampled)
:fast-zip.walk x 394 ops/sec ±1.88% (89 runs sampled)
Fastest is :fast-zip
Benchmark: vector zip edit...
:clojure.zip.edit x 33.89 ops/sec ±2.66% (61 runs sampled)
:fast-zip.edit x 89.38 ops/sec ±2.13% (78 runs sampled)
Fastest is :fast-zip.edit

TODO

• Create benchmarks that represent more functionality and different use cases (in progress)

Contributors

Thanks to

• Brandon Bloom for his advice.
• Zach Tellman
• Joel Holdbrooks for the ClojureScript version.
• David Thomas Hume
• Karsten Schmidt (CLJX restructure, deftype impl & benchmark updates)

License

Distributed under the Eclipse Public License, the same as Clojure.