我想测量我的方法在运行时执行中的性能速度，但我不确定我所做的是否真的测量了我想要的方法的性能或正在做其他事情。如果它衡量的是我的方法的性能速度，那么它的可靠性就更高了。我想测量性能速度的方法称为 FFMulFast，它计算伽罗瓦域 (256) 的两个多项式部分的乘法。注意：我将只提供与我的问题相关的代码。
public class GaloaField {
// some fields here
public int FFMulFast(int a, int b){
int t = 0;;
if (a == 0 || b == 0)
return 0;
/* The multiplication is done by using lookup tables. We have used both logarithmic and exponential table for mul
* the idea is firstly look to Logarithmic table then add their powers and find the corresponding of this to exponential table */
t = (Log[(a & 0xff)] & 0xff) + (Log[(b & 0xff)] & 0xff);
if (t > 255) t = t - 255;
return Exp[(t & 0xff)];
}
//some other methods here
public void runABunch() { //method which will measure the performance speed of FFMulFast
long start = System.nanoTime();
int a=0x56;
int b=0xf4;
for (int i = 0; i < 5000000; i++)
FFMulFast(a,b);
long end = System.nanoTime();
System.out.println("Time: " + (end-start));
}
public static void main (String [] args) {
GaloaField galoa=new GaloaField();
galoa.runABunch();
}