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BenchmarkSqrt.java

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package symjava.examples;

import static symjava.symbolic.Symbol.x;

import static symjava.math.SymMath.*;

import java.util.ArrayList;

import symjava.bytecode.BytecodeFunc;

import symjava.symbolic.Expr;

import symjava.symbolic.Func;

public class BenchmarkSqrt {

public static double factorial(int n) {

double rlt = 1;

for(int i=1; i<=n; i++)

rlt *= i;

return rlt;

}

public static void main(String[] args) {

int n = 9;

Expr expr = 0;

Expr term;

ArrayList<Expr> exprs = new ArrayList<Expr>();

for(int i=1; i<=n; i++) {

term = (pow(x, 1.0/i));

//term = (sqrt(x, i));

//System.out.println(term);

expr = expr + term;

exprs.add(expr);

}

ArrayList<BytecodeFunc> funcs = new ArrayList<BytecodeFunc>();

for(int i=0; i<n; i++) {

Func func = new Func("func"+i, exprs.get(i));

BytecodeFunc bfunc = func.toBytecodeFunc();

System.out.println(bfunc.apply(0.1));

funcs.add(bfunc);

}

int N=10000000;

for(int i=0; i<funcs.size(); i++) {

long begin = System.currentTimeMillis();

for(int j=0; j<N; j++) {

funcs.get(i).apply(0.1);

}

long end = System.currentTimeMillis();

System.out.println("Time: "+((end-begin)/1000.0)+" expr="+exprs.get(i));

}

}

}