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102 lines
3.7 KiB
Plaintext
102 lines
3.7 KiB
Plaintext
(load "Statistics.carp")
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(system-include "bench.h")
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(register get-time-elapsed (Fn [] Double))
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(defmodule Bench
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(defn get-unit [n]
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(cond
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(< n 1000.0) (String.append (Double.str n) @"ns")
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(< n 1000000.0) (String.append (Double.str (/ n 1000.0)) @"µs")
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(< n 1000000000.0) (String.append (Double.str (/ n 1000000.0)) @"ms")
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(String.append (Double.str (/ n 1000000000.0)) @"s")))
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(defn print [title n]
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(let [unit (get-unit n)]
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(do
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(IO.print title)
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(IO.println &unit))))
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(defn ns-iter-inner [f n]
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(let [start (get-time-elapsed)]
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(do
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(for [i 0 n]
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(let [x (f)] ; this little trick guarantees that f can be any snippet and return whatever
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()))
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(Double.- (get-time-elapsed) start))))
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(defn print-bench-results [res total]
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(do
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(print "Total time elapsed: " total)
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(print "Best case: " (Statistics.Summary.min res))
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(print "Worst case: " (Statistics.Summary.max res))
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(print "Standard deviation: " (Statistics.Summary.stdev res))))
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(defn get-samples [f n]
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(let [zero 0.0
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samples (Array.replicate 50 &zero)]
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(do
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(for [i 0 50]
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(Array.aset! &samples i (Double./ (ns-iter-inner f (Double.to-int n)) n)))
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(Statistics.summary &(Statistics.winsorize &samples 5.0)))))
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(defn min-one [n]
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(if (> 1.0 n) n 1.0))
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; it is actually possible to make this run forever by supplying a _really_
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; long-running function, where long-running is everything over 30ms.
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(defn bench [f]
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(let [ns (ns-iter-inner f 1)
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ns-target-total 1000000.0
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_n (Double./ ns-target-total (min-one ns))
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n (min-one _n)
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total 0.0
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done false
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res &(Statistics.summary &[0.0])]
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(do
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(while (and (Double.< total 3000000000.0) (not done))
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(let [loop-start (get-time-elapsed)
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summ (get-samples f n)
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summ5 (get-samples f n)
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loop-run (- (get-time-elapsed) loop-start)]
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(if (and
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(Double.> loop-run 100000.0)
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(and
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(Double.< (Statistics.Summary.median-abs-dev-pct &summ) 1.0)
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(Double.< (Double.- (Statistics.Summary.median &summ)
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(Statistics.Summary.median &summ5))
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(Statistics.Summary.median-abs-dev &summ5))))
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(do
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(set! &total (Double.+ total loop-run))
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(set! &done true)
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(set! &res &summ5))
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(do
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(set! &total (Double.+ total loop-run))
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(if (< (Double.* n 10.0) n)
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; abort on overflow
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(set! &total (Double.+ total 3000000000.0))
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(set! &n (Double.* n 2.0)))))))
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(if done
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(print-bench-results res total)
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(IO.println "Could not stabilize benchmark after more than 3 seconds!")))))
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)
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(defmacro benchn [n form]
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(list 'let ['before (get-time-elapsed)
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'times []]
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(list 'do
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(list 'for ['i 0 n]
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(list 'let ['before-once (get-time-elapsed)]
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(list 'do
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form
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(list 'set! × (Array.push-back (Array.copy ×) (Double.- (get-time-elapsed) before-once))))))
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(list 'let ['total (Double.- (get-time-elapsed) before)
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'per (list 'Double./ 'total (list 'Double.from-int n))]
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(do
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(Bench.print "Total time elapsed: " total)
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(Bench.print "Time elapsed per run (average): " per)
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(Bench.print "Best case: " (Statistics.min ×))
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(Bench.print "Worst case: " (Statistics.max ×))
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(Bench.print "Standard deviation: " (Statistics.stdev ×)))))))
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