S>

int dosum(int a, int b) {
    return a + b;
}

#include <stdio.h>
#include <time.h>

int dosum(int a, int b);

int main(int argc, char** argv) {
    int count1 = atoi(argv[1]);
    int count2 = atoi(argv[2]);
    long c = clock();
    int l = 0, i, j;
    for( j = 0; j < count1; ++j ) {
        for( i = 0; i < count2; ++i ) {
            l = dosum(l, i);
        }
    }
    long end = clock(); 
    printf( "l = %d\n", l );
    printf("%f\n", (float)(end - c) / (float)CLOCKS_PER_SEC);
    return 0;
}

public interface DoSum {
    int dosum(int a, int b);
}

public class DoSumImpl implements DoSum {
    public int dosum(int a, int b) {
        return a + b;
    }
}

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
import java.net.*;

public class Test4 {
    public static void main(String[] args) throws Exception {        
        int count1 = Integer.parseInt(args[1]);
        int count2 = Integer.parseInt(args[2]);
        // Можно заменить эту строку
        DoSum d = (DoSum) Class.forName(args[0]).newInstance();
        // Двумя вот этими, тогда код будет подгружаться с сервера (и локальные DoSumImpl.java/DoSumImpl.class можно вообще удалить):
        //ClassLoader cl = new URLClassLoader(new URL[] { new URL("http://wfrag.org/files/") });
        //DoSum d = (DoSum) cl.loadClass(args[0]).newInstance();

        // Прогреем JVM :)
        test(d, count1+1, count2+1);
        test(d, count1+2, count2+2);
        System.err.println("Real results");
        // А вот теперь реально замерим:
        test(d, count1, count2);
        test(d, count1, count2);
    }

    public static void test(DoSum d, int count1, int count2) throws Exception {
        ThreadMXBean mx = ManagementFactory.getThreadMXBean();
        long c = mx.getCurrentThreadCpuTime();
        int l = 0, i, j;
        for( j = 0; j < count1; ++j ) {
            for( i = 0; i < count2; ++i ) {
                l = d.dosum(l, i);
            }
        }
        long end = mx.getCurrentThreadCpuTime(); 
        System.err.println( "l = " + l);
        System.err.println((float)(end - c) / 1000000000);
    }
}

wfrag@fragentoo ~/test/1 $ gcc -O3 -funroll-loops -finline-functions dosum.c -o libdosum.so -shared
wfrag@fragentoo ~/test/1 $ gcc -O3 -funroll-loops -finline-functions -L. -ldosum test4.c 
wfrag@fragentoo ~/test/1 $ LD_LIBRARY_PATH=. ./a.out 10 1000000000
l = 451808768
48.170000

wfrag@fragentoo ~/test/1 $ gcc -O3 -funroll-loops -finline-functions dosum.c -o libdosum.so -c
wfrag@fragentoo ~/test/1 $ gcc -O3 -funroll-loops -finline-functions -L. -ldosum test4.c 
wfrag@fragentoo ~/test/1 $ ./a.out 10 1000000000
l = 451808768
43.780000

wfrag@fragentoo ~/test/1 $ cat test4.c dosum.c  > test4combined.c
wfrag@fragentoo ~/test/1 $ gcc -O3 -funroll-loops -finline-functions test4combined.c 
wfrag@fragentoo ~/test/1 $ ./a.out 10 1000000000
l = 451808768
1.850000

wfrag@fragentoo ~/test/1 $ /opt/sun-jdk-1.6.0.06/bin/javac Test4.java 
wfrag@fragentoo ~/test/1 $ /opt/sun-jdk-1.6.0.06/bin/java -cp . -XX:CompileThreshold=10 -server  Test4 DoSumImpl 10 1000000000
l = 1618564864
27.84
l = 490353676
30.24
Real results
l = 451808768
5.64
l = 451808768
5.65