C time program

C time program DEFAULT

This post will discuss how to find the execution time of a C program in Windows and Linux environments.

There are four commonly used methods to find the execution time of a C program:

1. Using function

We can use the function provided by the header file to calculate the CPU time consumed by a task within a C application. It returns the type, which stores the total number of clock ticks.

To compute the total number of seconds elapsed, we need to divide the total number of clock ticks elapsed by macro (also present in ) as shown below:

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#include <stdio.h>

#include <time.h>       // for clock_t, clock(), CLOCKS_PER_SEC

#include <unistd.h>     // for sleep()

 

// main function to find the execution time of a C program

intmain()

{

    // to store the execution time of code

    doubletime_spent=0.0;

 

    clock_t begin=clock();

 

    // do some stuff here

    sleep(3);

 

    clock_t end=clock();

 

    // calculate elapsed time by finding difference (end - begin) and

    // dividing the difference by CLOCKS_PER_SEC to convert to seconds

    time_spent+=(double)(end-begin)/CLOCKS_PER_SEC;

 

    printf("The elapsed time is %f seconds",time_spent);

 

    return0;

}

DownloadRun Code

Output (may vary):

The elapsed time is 0.000014 seconds

 
Please note that the function doesn’t return the actual amount of time elapsed but returns the amount of time taken by the underlying operating system to run the process. In other words, the actual wall clock time might actually be much greater.

2. Using function

The header also provides function that returns the total number of seconds elapsed since the Epoch (00:00:00 UTC, January 1, 1970). It takes the pointer to as an argument, which is usually passed as and returns the type. If the argument is not , then the return value is also stored in the memory pointed by the argument.

Its usage is similar to the function, as shown below:

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#include <stdio.h>

#include <time.h>       // for time()

#include <unistd.h>     // for sleep()

 

// main function to find the execution time of a C program

intmain()

{

    time_t begin=time(NULL);

 

    // do some stuff here

    sleep(3);

 

    time_t end=time(NULL);

 

    // calculate elapsed time by finding difference (end - begin)

    printf("The elapsed time is %d seconds",(end-begin));

 

    return0;

}

DownloadRun Code

Output:

The elapsed time is 3 seconds

3. Using function

The function returns the wall clock time elapsed since the Epoch and store it in the structure, expressed as seconds and microseconds.

It is defined in the header file and takes two arguments – the first argument is a reference to the structure, and the second argument is a null pointer. The structure is declared as follows by the header:

struct timeval {
    long tv_sec;    /* seconds */
    long tv_usec;   /* microseconds */
};

 
The following code demonstrates the usage of by measuring the wall clock time:

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#include <stdio.h>

#include <sys/time.h>   // for gettimeofday()

#include <unistd.h>     // for sleep()

 

// main function to find the execution time of a C program

intmain()

{

    structtimeval start,end;

 

    gettimeofday(&start,NULL);

 

    // do some stuff here

    sleep(5);

 

    gettimeofday(&end,NULL);

 

    longseconds=(end.tv_sec-start.tv_sec);

    longmicros=((seconds*1000000)+end.tv_usec)-(start.tv_usec);

 

    printf("The elapsed time is %d seconds and %d micros\n",seconds,micros);

 

    return0;

}

DownloadRun Code

Output (may vary):

The elapsed time is 5 seconds and 5000147 micros

 
This function is supported by GCC compilers and might not work on Windows.

4. Using function

We can also use function defined in header file which supports up to nanosecond accuracy. It takes two arguments – the first argument is clock type, and the second argument is a pointer to the structure. The structure is provided by the header and is declared as:

struct timespec {
    time_t tv_sec;   /* seconds */
    long tv_nsec;    /* nanoseconds */
};

 
The following code calculates elapsed time using a system-wide real-time clock, identified by , whose time represents seconds and nanoseconds since the Epoch.

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#include <stdio.h>

#include <time.h>    // for clock_t, clock()

#include <unistd.h>    // for sleep()

 

#define BILLION  1000000000.0

 

// main function to find the execution time of a C program

intmain()

{

    structtimespec start,end;

 

    clock_gettime(CLOCK_REALTIME,&start);

 

    // do some stuff here

    sleep(3);

 

    clock_gettime(CLOCK_REALTIME,&end);

 

    // time_spent = end - start

    doubletime_spent=(end.tv_sec-start.tv_sec)+

                        (end.tv_nsec-start.tv_nsec)/BILLION;

 

    printf("The elapsed time is %f seconds",time_spent);

 

    return0;

}

Download Code

 
Please note that the function will work only on very few UNIX machines.

That’s all about finding the execution time of a C program.

 
Related Post:

Measure elapsed time of a C++ program using Chrono library




Thanks for reading.

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How to measure time taken by a function in C?

To calculate time taken by a process, we can use clock() function which is available time.h. We can call the clock function at the beginning and end of the code for which we measure time, subtract the values, and then divide by CLOCKS_PER_SEC (the number of clock ticks per second) to get processor time, like following.

#include <time.h> clock_t start, end; double cpu_time_used; start = clock(); ... /* Do the work. */ end = clock(); cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;

Following is a sample C program where we measure time taken by fun(). The function fun() waits for enter key press to terminate.

Take a step-up from those "Hello World" programs. Learn to implement data structures like Heap, Stacks, Linked List and many more! Check out our Data Structures in C course to start learning today.

Output: The following output is obtained after waiting for around 4 seconds and then hitting enter key.

fun() starts Press enter to stop fun fun() ends fun() took 4.017000 seconds to execute

How to find time taken by a command/program on Linux Shell?

References:
http://www.gnu.org/software/libc/manual/html_node/CPU-Time.html
http://www.cplusplus.com/reference/ctime/clock/?kw=clock

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

My Personal Notesarrow_drop_up
Sours: https://www.geeksforgeeks.org/how-to-measure-time-taken-by-a-program-in-c/
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Sours: https://www.codegrepper.com/code-examples/c/c+program+to+find+execution+time+in+milliseconds
C Programming Tutorial 76, Time Functions

How to measure time taken by a function in C?

To calculate time taken by a process, we can use clock() function which is available time.h. We can call the clock function at the beginning and end of the code for which we measure time, subtract the values, and then divide by CLOCKS_PER_SEC (the number of clock ticks per second) to get processor time, like following.

#include <time.h> clock_t start, end; double cpu_time_used; start = clock(); ... /* Do the work. */ end = clock(); cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;

Following is a sample C program where we measure time taken by fun(). The function fun() waits for enter key press to terminate.

Output: The following output is obtained after waiting for around 4 seconds and then hitting enter key.

fun() starts Press enter to stop fun fun() ends fun() took 4.017000 seconds to execute

How to find time taken by a command/program on Linux Shell?

References:
http://www.gnu.org/software/libc/manual/html_node/CPU-Time.html
http://www.cplusplus.com/reference/ctime/clock/?kw=clock

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.



Sours: https://tutorialspoint.dev/language/c/how-to-measure-time-taken-by-a-program-in-c

Program c time

C program to find time taken by a program or function to execute in seconds

  • Write a program in C to calculate the execution time of a program in seconds.
  • How to find the time taken by a function or statement to execute in C.
To find the execution time of a C program, we will use clock() function of time.h header file.
  • clock() function returns the number of clock ticks elapsed since the program started.
  • To find the total execution time of a program we will call clock function twice, once at the beginning of main function and then again at the end of main function.
  • Now, the total execution time of a program(in units of cpu clock ticks) is the difference between these two time instances.
  • To get the execution time in seconds, we will need to divide the difference by CLOCKS_PER_SEC(the number of clock ticks per second).
Placement of clock() function to find execution time of C program
# include<stdio.h> # include<time.h> int main() { clock_t start, end; double execution_time; start = clock(); /* Put your code here */ end = clock(); execution_time = ((double)(end - start))/CLOCKS_PER_SEC;

C program to find execution time of a program

#include <stdio.h> #include <time.h> int main() { clock_t start, end; /* Store start time here */ start = clock(); /* put the main body of your program here */ printf("Enter any character\n"); getchar(); /* program logic ends here */ end = clock(); /* Get the time taken by program to execute in seconds */ double duration = ((double)end - start)/CLOCKS_PER_SEC; printf("Time taken to execute in seconds : %f", duration); return 0; } Output Enter any character d Time taken to execute in seconds : 2.371000

C program to find execution time of a functionn

Output Time taken to execute in seconds : 0.015000
Sours: https://www.techcrashcourse.com/2016/02/c-program-to-find-execute-time-of-program.html
How to Time Your Code (time, clock, times, clock_gettime)

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