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Add dumb loop microbenchmark #349

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Merged
merged 2 commits into from
Dec 3, 2024
Merged

Add dumb loop microbenchmark #349

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8bfee94
Add dumb loop microbenchmark
Dec 3, 2024
c279574
Merge branch 'main' into loop_bench
maximecb Dec 3, 2024
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4 changes: 4 additions & 0 deletions benchmarks.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -147,3 +147,7 @@ ruby-xor:
desc: pure-Ruby string XOR microbenchmark, analogous to xorcist C extension.
category: micro
single_file: true
loops-times:
desc: nested loop Integer#times and array access microbenchmark
category: micro
single_file: true
21 changes: 21 additions & 0 deletions benchmarks/loops-times.rb
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@@ -0,0 +1,21 @@
require_relative '../harness/loader'

# Fix these values for determinism
u = 5
r = 7

run_benchmark(10) do
a = Array.new(10000, 0)

4_000.times do |i|
4_000.times do |j|
a[i] += j % u
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@eregon eregon Dec 4, 2024 •
edited
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This modulo in the inner loop likely dominates the benchmark, I'd suggest to use & 0b111 or so instead.

end
a[i] += r
end

result = a[r]
if result != 8007
raise "incorrect result"
end
end
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