I have a fairly stable project github.com/robaho/fixed <http://github.com/robaho/fixed> which is almost 100% cpu bound. It doesn’t change so it makes a great way to compare the performance of different Go versions using the same hardware. I took the time to re-run the tests today.
Using 1.21.17:
BenchmarkAddFixed-8 2000000000 0.59 ns/op
0 B/op 0 allocs/op
BenchmarkAddDecimal-8 5000000 243 ns/op
176 B/op 8 allocs/op
BenchmarkAddBigInt-8 100000000 14.3 ns/op
0 B/op 0 allocs/op
BenchmarkAddBigFloat-8 20000000 78.8 ns/op
48 B/op 1 allocs/op
BenchmarkMulFixed-8 300000000 4.88 ns/op
0 B/op 0 allocs/op
BenchmarkMulDecimal-8 20000000 72.0 ns/op
80 B/op 2 allocs/op
BenchmarkMulBigInt-8 100000000 17.1 ns/op
0 B/op 0 allocs/op
BenchmarkMulBigFloat-8 30000000 35.5 ns/op
0 B/op 0 allocs/op
BenchmarkDivFixed-8 300000000 4.71 ns/op
0 B/op 0 allocs/op
BenchmarkDivDecimal-8 2000000 779 ns/op
568 B/op 21 allocs/op
BenchmarkDivBigInt-8 30000000 46.1 ns/op
8 B/op 1 allocs/op
BenchmarkDivBigFloat-8 20000000 108 ns/op
24 B/op 2 allocs/op
BenchmarkCmpFixed-8 2000000000 0.38 ns/op
0 B/op 0 allocs/op
BenchmarkCmpDecimal-8 200000000 8.05 ns/op
0 B/op 0 allocs/op
BenchmarkCmpBigInt-8 300000000 5.87 ns/op
0 B/op 0 allocs/op
BenchmarkCmpBigFloat-8 300000000 5.46 ns/op
0 B/op 0 allocs/op
BenchmarkStringFixed-8 20000000 57.4 ns/op
32 B/op 1 allocs/op
BenchmarkStringNFixed-8 20000000 55.6 ns/op
32 B/op 1 allocs/op
BenchmarkStringDecimal-8 10000000 218 ns/op
64 B/op 5 allocs/op
BenchmarkStringBigInt-8 10000000 122 ns/op
24 B/op 2 allocs/op
BenchmarkStringBigFloat-8 3000000 416 ns/op
192 B/op 8 allocs/op
BenchmarkWriteTo-8 30000000 45.8 ns/op
18 B/op 0 allocs/op
and version 1.21.5:
BenchmarkAddFixed-8 1000000000 0.9735 ns/op
0 B/op 0 allocs/op
BenchmarkAddDecimal-8 14311995 69.99 ns/op
80 B/op 2 allocs/op
BenchmarkAddBigInt-8 100000000 13.42 ns/op
0 B/op 0 allocs/op
BenchmarkAddBigFloat-8 17506702 63.84 ns/op
48 B/op 1 allocs/op
BenchmarkMulFixed-8 313983104 3.732 ns/op
0 B/op 0 allocs/op
BenchmarkMulDecimal-8 18046520 66.59 ns/op
80 B/op 2 allocs/op
BenchmarkMulBigInt-8 100000000 10.79 ns/op
0 B/op 0 allocs/op
BenchmarkMulBigFloat-8 49186024 24.30 ns/op
0 B/op 0 allocs/op
BenchmarkDivFixed-8 306888069 3.721 ns/op
0 B/op 0 allocs/op
BenchmarkDivDecimal-8 2510688 462.4 ns/op
384 B/op 12 allocs/op
BenchmarkDivBigInt-8 33993822 37.02 ns/op
8 B/op 1 allocs/op
BenchmarkDivBigFloat-8 9415330 111.5 ns/op
24 B/op 2 allocs/op
BenchmarkCmpFixed-8 1000000000 0.2548 ns/op
0 B/op 0 allocs/op
BenchmarkCmpDecimal-8 168714549 7.086 ns/op
0 B/op 0 allocs/op
BenchmarkCmpBigInt-8 234895634 4.952 ns/op
0 B/op 0 allocs/op
BenchmarkCmpBigFloat-8 260814464 4.503 ns/op
0 B/op 0 allocs/op
BenchmarkStringFixed-8 23725470 50.57 ns/op
24 B/op 1 allocs/op
BenchmarkStringNFixed-8 23666628 50.67 ns/op
24 B/op 1 allocs/op
BenchmarkStringDecimal-8 5665790 200.1 ns/op
56 B/op 4 allocs/op
BenchmarkStringBigInt-8 10596398 100.2 ns/op
16 B/op 1 allocs/op
BenchmarkStringBigFloat-8 2922332 391.2 ns/op
176 B/op 7 allocs/op
BenchmarkWriteTo-8 45734523 31.53 ns/op
23 B/op 0 allocs/op
which is pretty impressive across the board.
Only 2 tests show any degradation and most show significant improvement.
On the two that degrade, AddFixed is a fairly trivial add of 2 longs, so that
is surprising. Strangely, WriteTo shows a different number of B/op on different
runs (all of the other tests are stable).
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