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EdGarrity / Clojush

Sandbox for playing with Clojush
Eclipse Public License 1.0
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Benchmark Java Arrarys #3

Closed EdGarrity closed 5 years ago

EdGarrity commented 5 years ago

Benchmark how Java Arrays could improve performance. See http://clojure-goes-fast.com/blog/java-arrays-and-unchecked-math/ for further details.

EdGarrity commented 5 years ago

2-D Java Arrays were slower then an array of vectors of vectors.

To test this, I did the following:

(defn load-datatable-2
  "Loads the data file into a data table"
  []
  (to-array-2d (drop 1 
                     (with-open [in-file (io/reader "src/clojush/genesis/test-data/dataTable.csv")]
                       (->>
                        (csv/parse-csv in-file)
                        (cast-with #(Double/parseDouble %))
                        doall)
                       ))))

(def datatable-2 (load-datatable-2))

I then ran the following tests (shown with results)

clojush.genesis.genesis> (time (get-cell-from-datatable 0 5)) "Elapsed time: 0.041641 msecs" 8.49834

clojush.genesis.genesis> (time (aget ^"[[J" (aget datatable-2 0) 5)) "Elapsed time: 0.116171 msecs" 8.49834

The Java Array was almost 3 times slower than the array of vectors of vectors.