measuring time
 

Hi,



How do you measure time between events in linux?
are there any nice and short functions you can write?


Hano

Most languages have time functions built in. For instance, Java has a System.currentTimeMillis() method that gives you the time in milliseconds.

My RedHat 7.2 installation came with kdevelop-2.0-1
That includes these nice references for C and C++ functions

/usr/share/doc/HTML/en/kdevelop/reference/C/cref.html
/usr/share/doc/HTML/en/kdevelop/reference/CPLUSPLUS/cref.html

hey, i end up answering myself again...

i did this C++ class as a chronometer, so enjoy everyone:

#include <sys/timeb.h>

class chronometer {
private:
struct timeb start_time;
struct timeb end_time;
int state;
int aux;
int sec;
int msec;
float total_seconds;

public:
chronometer(){state=0; };
~chronometer() {};

void start() {
reset();
state=1;
aux=ftime(&start_time);
};

void stop() {
aux=ftime(&end_time);
if (state==1) {
state=0;
total_seconds+=elapsed_time();
};
};

void restart() {
stop();
state=1;
aux=ftime(&start_time);
};

void reset() {
total_seconds=0.0;
};

float read_time() {
if (state==1) {
stop();
state=1;
aux=ftime(&start_time);
};
return total_seconds;
};

float elapsed_time() {
float seconds;
sec=end_time.time-start_time.time;
msec=end_time.millitm-start_time.millitm;
if (msec<0) {
sec--;
msec+=1000;
};
seconds=((float)msec )/1000;
seconds+=sec;
return seconds;
};

};


using it is easy and straightforward, just:

chronometer myclock;
myclock.start(); //start chronometer
//do whatever you want to clock
cout<<" have been up "<<myclock.read_time()<<"seconds "<<end;
myclock.stop(); //pause chronometer
//bla bla bla
myclock.restart(); //restart

...and so on

Hano