On 09/11/17 09:00, Laurent Bourgès wrote: > The Marlin renderer (JEP265) uses few Math functions: sqrt, cbrt, acos... > > Could you check if the current JDK uses C2 intrinsics or libfdm (native / > JNI overhead?) and tell me if such functions are already highly optimized > in jdk9 or 10 ? > > Some people have implemented their own fast Math like Apache Commons Math > or JaFaMa libraries that are 10x faster for acos / cbrt.
I'm not seeing that with Apache Commons Math. I'm seeing this: Benchmark Mode Cnt Score Error Units MathBenchmark.fastMathCbrt avgt 5 33.199 ? 0.122 ns/op MathBenchmark.mathCbrt avgt 5 43.124 ? 0.162 ns/op MathBenchmark.fastMathAcos avgt 5 85.985 ? 4.586 ns/op MathBenchmark.mathAcos avgt 5 28.326 ? 0.044 ns/op It's nice, but it certainly isn't 10x. -- Andrew Haley Java Platform Lead Engineer Red Hat UK Ltd. <https://www.redhat.com> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671
