[Clojure/Java] Benchmarks of different ways of splitting a string by a char

string-split-benchmarks-result.txt

# Benchmarking (.split test-input "\\.")

Evaluation count : 72101040 in 60 samples of 1201684 calls.
             Execution time mean : 828.458928 ns
    Execution time std-deviation : 29.055494 ns
   Execution time lower quantile : 800.771006 ns ( 2.5%)
   Execution time upper quantile : 895.752028 ns (97.5%)
                   Overhead used : 2.778847 ns

Found 5 outliers in 60 samples (8.3333 %)
	low-severe	 2 (3.3333 %)
	low-mild	 3 (5.0000 %)
 Variance from outliers : 22.1807 % Variance is moderately inflated by outliers

# Benchmarking (.split #"\." test-input)

Evaluation count : 96236220 in 60 samples of 1603937 calls.
             Execution time mean : 629.194967 ns
    Execution time std-deviation : 17.581353 ns
   Execution time lower quantile : 611.170657 ns ( 2.5%)
   Execution time upper quantile : 685.200170 ns (97.5%)
                   Overhead used : 2.778847 ns

Found 5 outliers in 60 samples (8.3333 %)
	low-severe	 2 (3.3333 %)
	low-mild	 3 (5.0000 %)
 Variance from outliers : 15.7402 % Variance is moderately inflated by outliers

# Benchmarking (org.apache.commons.lang3.StringUtils/split test-input \.)

Evaluation count : 335815860 in 60 samples of 5596931 calls.
             Execution time mean : 177.416984 ns
    Execution time std-deviation : 5.619332 ns
   Execution time lower quantile : 171.281009 ns ( 2.5%)
   Execution time upper quantile : 191.734901 ns (97.5%)
                   Overhead used : 2.778847 ns

Found 7 outliers in 60 samples (11.6667 %)
	low-severe	 2 (3.3333 %)
	low-mild	 5 (8.3333 %)
 Variance from outliers : 18.9616 % Variance is moderately inflated by outliers

string-split-benchmarks.clj

;; lein try criterium org.apache.commons/commons-lang3

(use 'criterium.core)

(defmacro multibench [& exprs]
  `(do ~@(for [expr# exprs]
           `(do (println "#" "Benchmarking" (pr-str '~expr#))
                (println)
                (bench ~expr#)
                (println)))))

(def ^String test-input "foo.bar.baz.foo.bar.baz")

(multibench (.split test-input "\\.")
            (.split #"\." test-input)
            (org.apache.commons.lang3.StringUtils/split test-input \.))