Clojure 1.8.0-alpha2 tuple performance

clj-1.8.0-alpha2-tuple-perf.clj

;;
;; LATEST UPDATE: 25 July 2015
;;
;; ****************************************************************
;; ** NB false alarm! My original benchmarks showing large perf  **
;; ** improvements with tuples turned out to be noise,           **
;; ** unfortunately. Current (+more reliable) numbers seem[1] to **
;; ** show no consistent significant advantage using currently   **
;; ** available tuple implementations against real-world code.   **
;; **                                                            **
;; ** Sincere apologies for jumping the gun + publishing dodgy   **
;; ** results! - Peter Taoussanis                                **
;; **                                                            **
;; ** [1] Not a final word; think this'll need more time to      **
;; **     become clear one way or the other.                     **
;; ****************************************************************
;; ** Latest results table on Google Docs: https://goo.gl/khgT83 **
;; ****************************************************************

*clojure-version* ; + -server jvm
(require '[criterium.core :as criterium :refer [bench quick-bench]
           :rename {quick-bench qb}])

;; [1] 1.7.0
;; [2] 1.8.0-alpha2
;; [3] 1.8.0-snapshot as of b8607d587
;; [4] mikera's fork at https://github.com/mikera/clojure/tree/clj-1517

(let [v  [1 2 3 4]
      v2 [1 2 3 "foo"]
      x 1
      y 2
      z 3]
                                    ; [1] ; [2] ; [3] ; [4]
  (qb (conj v 5))                   ; 59  ; 24  ; 21  ; 22
  (qb (assoc v 1 3))                ; 44  ; 74  ; 64  ; 68
  (qb (assoc {} :v1 v :v2 v :v3 v)) ; 405 ; 491 ; 388 ; 446
  (qb (subvec v 1 3))               ; 27  ; 24  ; 25  ; 26
  (qb [x y z])                      ; 38  ; 22  ; 21  ; 22
  (qb [[[x y z] y z] y z])          ; 91  ; 46  ; 53  ; 49


  (qb (let [[x y z] v]))            ; 22  ; 103 ; 97  ; 97
  (qb (peek v))                     ; 16  ; 24  ; 26  ; 27
  (qb (pop v))                      ; 46  ; 64  ; 65  ; 69
  (qb (seq v))                      ; 35  ; 35  ; 34  ; 31

  (qb (rseq v))                     ; 23  ; 19  ; 18  ; 20
  (qb (count v))                    ; 16  ; 14  ; 15  ; 17
  (qb (reduce (fn [acc in]) nil v)) ; 62  ; 182 ; 184 ; 202
  (qb (mapv inc v))                 ; 361 ; 599 ; 565 ; 559
  (qb (into [0] v))                 ; 468 ; 560 ; 536 ; 783
  (qb (hash [[[x y z] y z] y z]))   ; 697 ; 465 ; 468 ; 454
  (qb (hash [x y z]))               ; 249 ; 238 ; 220 ; 173
  (qb (= v v2))                     ; 265 ; 306 ; 85  ; 82
  )

Rich's latest feedback for anyone following this: http://dev.clojure.org/jira/browse/CLJ-1517?focusedCommentId=40370&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-40370