Yep. Haven’t dig into it. I assume it has to do with allocations. That it is 2x faster than Go is somewhat suspect as well.
I was more sharing for the change in Go performance. On Jun 21, 2024, at 2:11 PM, 'Brian Candler' via golang-nuts <golang-nuts@googlegroups.com> wrote:
> 4775.994 ± 13310.309
Those are pretty wide error bars though...
On Friday 21 June 2024 at 17:15:05 UTC+1 Robert Engels wrote:
I had the opportunity to revisit my interface dispatch benchmark ( https://github.com/robaho/go-dispatch-test).
Previously, the dispatching using pointer receivers was nearly 3x slower (i.e. 5.5 ns to 12.6 ns):
goos: darwin goarch: amd64 BenchmarkIDispatch-8 300000000 5.56 ns/op BenchmarkDispatch-8 2000000000 1.57 ns/op BenchmarkArrayParms-8 200000 9265 ns/op PASS
and
goos: darwin goarch: amd64 BenchmarkIDispatch-8 100000000 12.6 ns/op BenchmarkDispatch-8 2000000000 1.57 ns/op PASS
With the latest Go 1.22.4, the performance difference has reversed ! (tests have been combined for simplicity).
goos: darwin goarch: amd64 cpu: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz BenchmarkIDispatch-8 535263746 2.118 ns/op BenchmarkIDispatchPtr-8 675721244 1.773 ns/op BenchmarkDispatch-8 1000000000 0.6953 ns/op BenchmarkArrayParms-8 184212 6440 ns/op PASS
Pretty impressive work. The interface based dispatch is almost equal to the Java version now:
Benchmark Mode Cnt Score Error Units TestJavaDispatch.TestArrayDispatch avgt 3 4775.994 ± 13310.309 ns/op TestJavaDispatch.TestDispatch avgt 3 0.941 ± 0.088 ns/op TestJavaDispatch.TestIDispatch avgt 3 1.331 ± 0.146 ns/op
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