mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-12-26 02:21:43 +08:00
116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
/*
|
|
Copyright (c) 2008-2015 Jan W. Krieger (<jan@jkrieger.de>, <j.krieger@dkfz.de>), German Cancer Research Center (DKFZ) & IWR, University of Heidelberg
|
|
|
|
last modification: $LastChangedDate: 2015-06-10 19:19:10 +0200 (Mi, 10 Jun 2015) $ (revision $Rev: 3976 $)
|
|
|
|
This software is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License (LGPL) as published by
|
|
the Free Software Foundation, either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License (LGPL) for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License (LGPL)
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
Name: jkqtphighrestimer.cpp
|
|
Copyright: (c) 2007
|
|
Author: Jan krieger <jan@jkrieger.de>, http://www.jkrieger.de/
|
|
*/
|
|
|
|
#include "jkqtphighrestimer.h" // class's header file
|
|
|
|
|
|
JKQTPHighResTimer::JKQTPHighResTimer() {
|
|
start();
|
|
}
|
|
|
|
JKQTPHighResTimer::~JKQTPHighResTimer() {
|
|
}
|
|
|
|
void JKQTPHighResTimer::start(){
|
|
#ifdef __LINUX__
|
|
#endif
|
|
#ifdef __WINDOWS__
|
|
LARGE_INTEGER fr;
|
|
QueryPerformanceFrequency(&fr);
|
|
freq=(double)(fr.QuadPart);
|
|
QueryPerformanceCounter(&last);
|
|
#else
|
|
gettimeofday(&last,0);
|
|
#endif
|
|
};
|
|
|
|
double JKQTPHighResTimer::get_time(){
|
|
#ifdef __LINUX__
|
|
#endif
|
|
#ifdef __WINDOWS__
|
|
LARGE_INTEGER now;
|
|
QueryPerformanceCounter(&now);
|
|
return ((double)(now.QuadPart-last.QuadPart)/freq)*1e6;
|
|
#else
|
|
struct timeval tv;
|
|
gettimeofday(&tv,0);
|
|
|
|
long long t1, t2;
|
|
t1 = last.tv_sec * 1000000 + last.tv_usec;
|
|
t2 = tv.tv_sec * 1000000 + tv.tv_usec;
|
|
return abs(t2 - t1);
|
|
|
|
|
|
#endif
|
|
};
|
|
|
|
|
|
void JKQTPHighResTimer::test(double* mean, double* stddev, unsigned long* histogram, double* histogram_x, unsigned long histogram_size){
|
|
unsigned long runs=1000000;
|
|
double* h=(double*)malloc(runs*sizeof(double));
|
|
*mean = 0;
|
|
*stddev = 0;
|
|
/* time measurement */
|
|
double l=get_time(), n;
|
|
for (unsigned long i=0; i<runs; i++) {
|
|
n=get_time();
|
|
h[i]=n-l;
|
|
l=n;
|
|
//printf("%lf\n",h[i]);
|
|
}
|
|
/* end measurement */
|
|
|
|
/* compute mean value */
|
|
double mymin=h[0];
|
|
double mymax=h[0];
|
|
for (unsigned long i=1; i<runs; i++) {
|
|
*mean+=h[i]/(runs-1);
|
|
if (h[i]>mymax) mymax=h[i];
|
|
if (h[i]<mymin) mymin=h[i];
|
|
}
|
|
//printf("%lf %lf\n", mymin, mymax);
|
|
double binwidth=0;
|
|
if (histogram_size>0) {
|
|
binwidth=(mymax-mymin)/(histogram_size-1);
|
|
for (unsigned int i=0; i<histogram_size; i++) {
|
|
histogram[i]=0;
|
|
histogram_x[i]=mymin+i*binwidth;
|
|
}
|
|
}
|
|
|
|
/* compute standard deviation */
|
|
for (unsigned long i=1; i<runs; i++) {
|
|
(*stddev)=(*stddev)+((double)h[i]-*mean)*((double)h[i]-*mean)/(double)(runs-2);
|
|
if (histogram_size>0) {
|
|
unsigned long bin=(unsigned int)floor((h[i]-mymin)/binwidth);
|
|
if (/*bin>=0 &&*/ bin<histogram_size) histogram[bin]++;
|
|
}
|
|
}
|
|
*stddev=sqrt(*stddev);
|
|
free(h);
|
|
};
|