Erik Hofman writes:
>
> Norman Vine wrote:
>
> >>>http://www.a1.nl/~ehofman/fgfs/download/usertime.output.gz
> >
> >
> > You have to let the process run much longer
> > until things like ssgMakeMipMaps don't show up in the top 100 :-)
>
> There is a new file after running FlightGear for about 23 minutes.
Hmm....
[40] 24.060 1.7% 29.3% 61.140 4.3% 2038 __powf (libm.so:
fpow.c, 145)
[96] 19.500 1.4% 35.3% 19.500 1.4% 650 __exp (libm.so:
exp.c, 103)
[102] 17.460 1.2% 37.8% 17.460 1.2% 582 __log (libm.so:
log.c, 207)
I don't think these ever showed up before :-(
Maybe this will help show how not to have pow() show up anyway
The others often have work arounds too.
Norman
#include <math.h>
#include <stdio.h>
#include <time.h>
int main(int argc, char **argv)
{
double color[3];
double sun_factor = 1;
int i;
int n=1000000;
int start = clock();
for( i=0; i<n; i++ )
{
color[0] = pow(sun_factor, 0.25);
color[1] = pow(sun_factor, 0.50);
color[2] = pow(sun_factor, 4.0);
}
printf("%d %f %f %f\n",clock()-start, color[0],color[1],color[2]);
start = clock();
for( i=0; i<n; i++ )
{
color[1] = sqrt(sun_factor);
color[0] = sqrt(color[1]);
color[2] = sun_factor * sun_factor;
color[2] *= color[2];
}
printf("%d %f %f %f\n",clock()-start, color[0],color[1],color[2]);
start = clock();
for( i=0; i<n; i++ )
{
// if( sun_factor == 1 )
// {
color[0] = 1;
color[1] = 1;
color[2] = 1;
// }
// else if( sun_factor == 0 )
// {
// color[0] = 0;
// color[1] = 0;
// color[2] = 0;
// }
}
printf("%d %f %f %f\n",clock()-start, color[0],color[1],color[2]);
}
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