Answered: Compile the program using gcc -o…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Compile the program using gcc -o timing1 timing1.c -lm.
Run the program 10 times with a command line argument of 5000000. Report the timings observed in the output. Repeat the process with arguments 10000000 and 20000000.
Discuss the results observed, in particular regarding the resolution of the timing procedure used and the reproducibility of the results between runs. From the observed results,
estimate the time needed to compute a square root.

* timing1.c: test timing functions
*/
#include "stdio.h"
#include "time.h"
#include "sys/time.h"
#include "math.h"
#include "stdlib.h"
volatile double gtod (void)
{
static struct timeval tv;
static struct timezone tz;
gettimeofday (&tv,&tz);
return tv.tv_sec + 1.e-6*tv.tv_usec;
}|
int main(int argc, char** argv)
{
}
int natoi (argv[1]);
clock_t clk;
double t, t_cpu, t_real;
clk = clock());
t = gtod ();
/* do something */
double sum = 0.0;
int i;
for (i = 0; i<n; i++)
sum += sqrt((double) i);
long long delta_clock = clock()
clock() - clk;
t_cpu = ( (double) delta_clock ) / CLOCKS_PER_SEC;
t_real = gtod () - t;
printf(" clock: %1511d \n", delta_clock );
printf(" t cpu: %15.6f s\n", t_cpu);
printf(" t real: %15.6f s\n", t_real);

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