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timing_test.cc
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Sat, Jul 13, 23:24

timing_test.cc
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// Timing test example code
//
// Author : Chris H. Rycroft (LBL / UC Berkeley)
// Email : chr@alum.mit.edu
// Date : August 30th 2011
#include <ctime>
using namespace std;
#include "voro++.hh"
using namespace voro;
// Set up constants for the container geometry
const double x_min=-1,x_max=1;
const double y_min=-1,y_max=1;
const double z_min=-1,z_max=1;
// Set up the number of blocks that the container is divided into. If the
// preprocessor variable NNN hasn't been passed to the code, then initialize it
// to a good value. Otherwise, use the value that has been passed.
#ifndef NNN
#define NNN 26
#endif
const int n_x=NNN,n_y=NNN,n_z=NNN;
// Set the number of particles that are going to be randomly introduced
const int particles=100000;
// This function returns a random double between 0 and 1
double rnd() {return double(rand())/RAND_MAX;}
int main() {
clock_t start,end;
int i;double x,y,z;
// Create a container with the geometry given above, and make it
// periodic in each of the three coordinates. Allocate space for eight
// particles within each computational block.
container con(x_min,x_max,y_min,y_max,z_min,z_max,n_x,n_y,n_z,
true,true,true,8);
//Randomly add particles into the container
for(i=0;i<particles;i++) {
x=x_min+rnd()*(x_max-x_min);
y=y_min+rnd()*(y_max-y_min);
z=z_min+rnd()*(z_max-z_min);
con.put(i,x,y,z);
}
// Store the initial clock time
start=clock();
// Carry out a dummy computation of all cells in the entire container
con.compute_all_cells();
// Calculate the elapsed time and print it
end=clock();
double runtime=double(end-start)/CLOCKS_PER_SEC;
printf("%g\n",runtime);
}

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