Re: To go with Go or C/C++?

???? Tiib wrote:


It is.

<code>
#include <cstdio>
#include <ctime>

int ms_elapsed( clock_t start, clock_t stop )
{
        return static_cast<int>( 1000.0 * ( stop - start ) / CLOCKS_PER_SEC
);
}

bool checkThingsWithIf( int param )
{
        return param % 10000 != 0;
}

void checkThingsWithTry( int param )
{
        if ( param % 10000 == 0 )
        {
                throw true;
        }
}

int testWithIf( int param )
{
        int ret = 0;
        for ( int j = 0; j < 200; ++j )
        {
                if ( !checkThingsWithIf( param+j ) )
                {
                        return ret;
                }
                ++ret;
        }
        return ret;
}

int testWithTry( int param )
{
        int ret = 0;
        try
        {
                for ( int j = 0; j < 200; ++j )
                {
                        checkThingsWithTry( param+j );
                        ++ret;
                }
        }
        catch ( bool )
        { }
        return ret;
}

void benchmark( int (*foo)(int))
{
        clock_t volatile start;
        clock_t volatile stop;
        int volatile sum;

        start = clock();
        sum = 0;
        for ( int i = 0; i < 1000000; ++i )
        {
                sum += (*foo)( i );
        }
        stop = clock();
        printf( "It took %d msec; (sum %d)\n", ms_elapsed( start,stop) , sum
);
}

void benchmark( int (*foo)(int))
{
        clock_t volatile start;
        clock_t volatile stop;
        int volatile sum;

        start = clock();
        sum = 0;
        for ( int i = 0; i < 1000000; ++i )
        {
                sum += (*foo)( i );
        }
        stop = clock();
        printf( "It took %d msec; (sum %d)\n", ms_elapsed( start,stop) , sum
);
}

int main( int argc, char* argv[] )
{
        benchmark( &testWithTry);
        benchmark( &testWithIf);
}
</code>

<output>
rui@kubuntu:tmp$ g++ -O0 main.c++ && ./a.out
It took 2130 msec; (sum 197990000)
It took 2280 msec; (sum 197990000)
rui@kubuntu:tmp$ g++ -O1 main.c++ && ./a.out
It took 1150 msec; (sum 197990000)
It took 1050 msec; (sum 197990000)
rui@kubuntu:tmp$ g++ -O2 main.c++ && ./a.out
It took 1160 msec; (sum 197990000)
It took 670 msec; (sum 197990000)
rui@kubuntu:tmp$ g++ -O3 main.c++ && ./a.out
It took 700 msec; (sum 197990000)
It took 670 msec; (sum 197990000)
</output>

Rui Maciel