joshua/awesome-attractor
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did some testing (C-style array vs. valarray), see main for results

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Joshua Moerman 2010-10-29 23:51:44 +02:00
parent deba686e44
commit 4a8f72b897
2 changed files with 17 additions and 97 deletions
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1
AwesomeAttractor.cbp
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@ -50,6 +50,7 @@
</Build>
<Compiler>
<Add option="-Wall" />
<Add option="-Wno-unknown-pragmas" />
</Compiler>
<Linker>
<Add library="libpng" />

107
main.cpp
View file

@ -1,5 +1,6 @@
#include <iostream>
#include <ctime>
#include <valarray>
#include "Attractor.hpp"
#include "Canvas.hpp"
@ -7,11 +8,17 @@
#include "defines.hpp"
/*
I compared the performance of C-style arrays with valarray. My conclusion is that accessing and setting elements makes no difference (sometimes C-syle array's were just 2% faster, but sometimes valarray was 2% faster (5000000 samples)). But the allocation and initialisation of the valrray was like 30% faster, so it might be a good idea to change my C-style array to valarray. It is also nicer in use, one can use functions like sum, etc. How valarray manages memory may also be more efficient, but all i know is that a valarray<double> is bigger than a double* (in means of sizeof()), but that is not really an issue. So valarray!!!
*/
int main(int argc, char *argv[]) {
clock_t start, end;
double totalTime, totalIterations;
bool verbose = false;
// initialising stuff
Attractor myAttractor(ATTRACTOR_FILE);
@ -31,16 +38,17 @@ int main(int argc, char *argv[]) {
myAttractor.iterate();
myAttractor.plot();
}
system("clear");
if (verbose) {
myAttractor.output();
std::cout << j << "% done" << std::endl;
}
}
end = clock();
totalIterations = 100.0*iterations;
totalTime = ((double)(end-start)/(double)(CLOCKS_PER_SEC));
printf("\ntotal clock time: %f\n", totalTime );
printf("average iterations per second: %f\n\n", totalIterations/((double)(end-start)/(double)(CLOCKS_PER_SEC)) );
std::cout << std::endl << "total clock time: " << totalTime << std::endl;
std::cout << "average iterations per second: " << totalIterations/((double)(end-start)/(double)(CLOCKS_PER_SEC)) << std::endl << std::endl;
// saving output
start = clock();
@ -49,97 +57,8 @@ int main(int argc, char *argv[]) {
totalTime = ((double)(end-start)/(double)(CLOCKS_PER_SEC));
printf("total clock time for writing png: %f\n", totalTime );
printf("\n Awesome Attractor, version %s\n", __DATE__);
/*if ( argc <= 2 ) {
cout << endl << "nothing to do..." << endl;
cout << "usage:" << endl;
cout << " rendering to canvas: -a my_attractor.attr 500000000 my_attractor.canv 800 600 3" << endl;
cout << " canvas to png: -c my_attractor.canv 800 600 3 my_atttractor.png" << endl << endl;
exit(0);
}
int mode;
string argv1 = argv[1];
if ( argv1 == "-a" ) {
cout << "rendermode" << endl;
mode = 1;
} else if ( argv1 == "-c" ) {
cout << "canvasmode" << endl;
mode = 2;
} else {
cout << "i do.. i do... i do not understand... \"" << argv1 << "\""<< endl;
exit(0);
}
switch ( mode ) {
case 1: {
if ( argc != 8 ) {
cout << "all parameters must be set..." << endl;
exit(0);
}
string attractorFile = argv[2];
unsigned int iterations = atoi(argv[3]);
string canvasFile = argv[4];
unsigned int width = atoi(argv[5]);
unsigned int height = atoi(argv[6]);
unsigned int numColors = atoi(argv[7]);
Attractor attract(attractorFile.c_str());
cout << attractorFile << " is read" << endl;
Projector projection;
Canvas canvas(width, height, numColors);
projection.canvas = &canvas;
attract.projectors.push_back(&projection);
attract.init_range();
projection.output();
for ( unsigned int j = 1; j <= 100; j++ ) {
for ( unsigned int i = 0; 100*i <= iterations; i++ ) {
attract.iterate();
attract.plot();
}
cout << j << "% done" << endl;
}
canvas.output_raw(canvasFile.c_str());
cout << canvasFile << " is outputted" << endl;
break;
}
case 2: {
if ( argc != 7 ) {
cout << "all parameters must be set..." << endl;
exit(0);
}
string canvasFile = argv[2];
unsigned int width = atoi(argv[3]);
unsigned int height = atoi(argv[4]);
unsigned int numColors = atoi(argv[5]);
string pngFile = argv[6];
Canvas canvas(width, height, numColors);
canvas.input_raw(canvasFile.c_str());
cout << canvasFile << " is read" << endl;
for ( double v = -1.5; v < 1.6; v += 1.5 ) {
canvas.v = v;
canvas.output_file();
}
cout << pngFile << " was exported" << endl;
break;
}
default: {
cout << "WTF" << endl;
break;
}
}*/
std::cout << "total clock time for writing png: " << totalTime << std::endl;
std::cout << std::endl << "Awesome Attractor, version " << __DATE__ << std::endl;
return 0;