Jni

FFM is the new API trying to replace JNI and jep is here It is basically calling functions outside of JVM or accessing memory not managed by JVM. I wanted to test can FFM beat regular Java API, below you can find a simple test doing math sin with FFM and with regular Math.sin import java.lang.foreign.FunctionDescriptor; import java.lang.foreign.Linker; import java.lang.foreign.MemorySegment; import java.lang.foreign.SymbolLookup; import java.lang.foreign.ValueLayout; public class FFMSinTest { public static void main(String[] args) throws Throwable { Linker linker = Linker.nativeLinker(); SymbolLookup stdlib = linker.defaultLookup(); // Locate the "sin" function in the C math library MemorySegment sinAddress = stdlib.find("sin").orElseThrow(); FunctionDescriptor descriptor = FunctionDescriptor.of(ValueLayout.JAVA_DOUBLE, ValueLayout.JAVA_DOUBLE); var sinHandle = linker.downcallHandle(sinAddress, descriptor); double angle = Math.PI / 4; // 45 degrees in radians // Timing Java's Math.sin() long javaStartTime = System.nanoTime(); for (int i = 0; i < 1_000_000; i++) { double result = Math.sin(angle); } long javaEndTime = System.nanoTime(); long javaDuration = javaEndTime - javaStartTime; // Timing C sin via FFM long ffmStartTime = System.nanoTime(); for (int i = 0; i < 1_000_000; i++) { double result = (double) sinHandle.invoke(angle); } long ffmEndTime = System.nanoTime(); long ffmDuration = ffmEndTime - ffmStartTime; System.out.println("Java Math.sin() took: " + javaDuration / 1_000_000.0 + " ms"); System.out.println("C sin (FFM) took: " + ffmDuration / 1_000_000.0 + " ms"); } } And result is ...