Jni 与 Java 在 Android 中的性能比较

Compare jni and java performance on the Android platform.

Using dense floating-point calculations to test the performance differences between Jni and pure java, it is found that the computational performance is similar.

使用密集的浮点数计算来测试Jni和原生java之间的性能差别,发现计算性能两者类似

JniMethod:

JNIEXPORT jdouble JNICALL Java_ytr_jniperformance_JniWrapper_calculationTask
        (JNIEnv *env, jclass clazz, jint loop_count) {
    int i;
    double circle = 1;
    //Floating point operations are time consuming and loop the largest number of integers.
    for (i = 0; i < loop_count; i++) {
        circle *= 3.1415962;
    }
    return circle;
}

Java Method:

 private static double calculationTask(int loop_count) {
        int i;
        double circle = 1;
        //Floating point operations are time consuming and loop the largest number of integers.
        for (i = 0; i < loop_count; i++) {
            circle *= 3.1415962;
        }
        return circle;
    }

Screenshot: