40 lines
1.5 KiB
Nim
40 lines
1.5 KiB
Nim
import random, times, stats, strformat, math
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export random, times, stats, strformat, math
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proc warmup*() =
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# Warmup - make sure cpu is on max perf
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let start = cpuTime()
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var foo = 123
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for i in 0 ..< 300_000_000:
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foo += i*i mod 456
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foo = foo mod 789
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# Compiler shouldn't optimize away the results as cpuTime rely on sideeffects
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let stop = cpuTime()
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echo &"Warmup: {stop - start:>4.4f} s, result {foo} (displayed to avoid compiler optimizing warmup away)"
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template printStats*(experiment_name: string, compute_result: typed) {.dirty.} =
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echo "#################################################################"
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echo "\n" & experiment_name
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echo &"Collected {stats.n} samples in {global_stop - global_start:>4.3f} seconds"
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echo &"Average time: {stats.mean * 1000 :>4.3f} ms"
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echo &"Stddev time: {stats.standardDeviationS * 1000 :>4.3f} ms"
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echo &"Min time: {stats.min * 1000 :>4.3f} ms"
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echo &"Max time: {stats.max * 1000 :>4.3f} ms"
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echo "\nDisplay computation result to make sure it's not optimized away"
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echo compute_result # Prevents compiler from optimizing stuff away
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echo '\n'
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template bench*(name: string, compute_result: typed, body: untyped) {.dirty.}=
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block: # Actual bench
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var stats: RunningStat
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let global_start = cpuTime()
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for _ in 0 ..< nb_samples:
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let start = cpuTime()
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block:
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body
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let stop = cpuTime()
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stats.push stop - start
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let global_stop = cpuTime()
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printStats(name, compute_result)
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