On Wed, 2007-09-19 at 17:51 +0200, pgeorges wrote: > > Crosswords, compiled with cegcc, runs noticably slower than compiled > > with the m$ compiler. Eric House also reported this. I've not > > investigated this yet. We may have inefficiencies other than the code > > generated by the compiler. Something with the coredll perhaps ? > > > > Danny > > > Is it possible to know in which cases the slowdowns are encountered ? > CPU intensive code, I/O , system calls ? > What is the amount of slow down ? 10 % , 50 % ? > > Pascal
I don't have an eVC4 installed (only my children have Windows PC's) so I have no simple way to do comparisons. Xwords shows a noticable difference if you get it to refresh its screen. (It's a scrabble game application.) When compiled with cegcc, you can see how it draws the game board - takes one or 1.5 seconds. With the executable as you can download it from http://xwords.sf.net , the redraw is instantaneous. So that example could lead you to the conclusion that it's either graphics or system (DLL?) access. To know more, it probably takes only a couple of simple programs that do something silly 10000 times and measure the elapsed time. An example of such a program is attached, along with its output. Danny -- Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <windows.h>
// #include <mmsystem.h>
int main(int argc, char *argv[])
{
FILE *f;
// MMTIME mmt;
// MMRESULT mmr;
float n;
int i;
DWORD w1, w2;
f = fopen("/storage card/devel/float.txt", "w");
if (f == 0) {
return -1;
}
#if 0
if (timeGetSystemTime(&mmt, sizeof(mmt)) == TIMERR_NOERROR) {
fprintf(f, "No error\r\n");
} else {
}
#endif
w1 = timeGetTime();
fprintf(f, "Time is %ld\r\n", w1);
for (n = w1, i=0; i<30000; i++) {
n = n * 0.34 + 3.1;
}
w2 = timeGetTime();
fprintf(f, "Time is %ld\r\n", w2);
fprintf(f, "Difference : %ld\r\n", w2 - w1);
fclose(f);
return 0;
}
Time is 11963595 Time is 11963634 Difference : 39
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