Function Timer in C

[yoviesmanda]

I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

[Ian Collins]

yo*********@gmail.com wrote:

I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

Try comp.lang.c. When you do, make the question a bit clearer, what do
you want to time?

--
Ian Collins.

[Larry Smith]

yo*********@gmail.com wrote:

I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

Look up the clock() function (usually declared in <time.t>):

man clock

[Victor Bazarov]

Larry Smith wrote:

yo*********@gmail.com wrote:

>I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

Look up the clock() function (usually declared in <time.t>):

<ctime or <time.h>

man clock

and woman what?

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[Larry Smith]

Victor Bazarov wrote:

Larry Smith wrote:

>yo*********@gmail.com wrote:

>>I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

Look up the clock() function (usually declared in <time.t>):

<ctime or <time.h>

> man clock

and woman what?

V

Well gee, thanks for correcting the typing error.

'man' - FYI for Windows folks, that's the Unix manual viewer
command.

Ian posted from Solaris, and I mistakenly viewed his
email headers, instead of the OP's headers, when replying.

Thanks for the gracious corrections.

[Jim Langston]

<yo*********@gmail.comwrote in message
news:11*********************@w1g2000hsg.googlegrou ps.com...

>I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

I generally just use clock().

unsigned int Start = clock();
MyFunction();
unsigned int End = clock();
std::cout "Elapapsed time: " << End - Start << " ns" << "\n";

Modify to taste. I think it's ms. On my system it's 1/1000 of a second.

[James Kanze]

On Apr 6, 7:06 am, "Jim Langston" <[e-mail]:

<[e-mail] in message

news:11*********************@w1g2000hsg.googlegrou ps.com...

I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

I generally just use clock().

unsigned int Start = clock();
MyFunction();
unsigned int End = clock();
std::cout "Elapapsed time: " << End - Start << " ns" << "\n";

Modify to taste. I think it's ms.

It's CLOCKS_PER_SECOND. Posix requires CLOCKS_PER_SECOND to be
1000000, but it may vary on other systems. The best way to
write the above would be:

std::cout << "Elapapsed time: "
<< double( End - Start ) / CLOCKS_PER_SEC * 1000.0
<< " ms" << std::endl ;

On my system it's 1/1000 of a second.

In the old days, 50 or 60 used to be frequent values.

--
James Kanze (Gabi Software) email: ja*********@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[yoviesmanda]

Thanks for all ...

[Siddhartha Gandhi]

On Apr 6, 1:06 am, "Jim Langston" <[e-mail]:

<[e-mail] in message

news:11*********************@w1g2000hsg.googlegrou ps.com...

I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

I generally just use clock().

unsigned int Start = clock();
MyFunction();
unsigned int End = clock();
std::cout "Elapapsed time: " << End - Start << " ns" << "\n";

Modify to taste. I think it's ms. On my system it's 1/1000 of a second.

On most systems it is a millisecond. I use std::clock() as well,
margin of error of close to 10 milliseconds, though. You could also
use gprof or a similar profiler.

[James Kanze]

On Apr 9, 4:11 am, "Siddhartha Gandhi" <[e-mail]>
wrote:

On Apr 6, 1:06 am, "Jim Langston" <[e-mail]:

<[e-mail] in message

news:11*********************@w1g2000hsg.googlegrou ps.com...

>I have a problem with C programming. I want to make function timing
in C, but I don't know how the function or the algorithm. so, I need
your help to giveme information about it. Thanks.. for your
attention... see.. you..

I generally just use clock().

unsigned int Start = clock();
MyFunction();
unsigned int End = clock();
std::cout "Elapapsed time: " << End - Start << " ns" << "\n";

Modify to taste. I think it's ms. On my system it's 1/1000 of a second.

On most systems it is a millisecond.

On all systems, it's CLOCKS_PER_SEC. Other than that, the only
"standard" I know is Posix, which requires a value of 1000000
for CLOCKS_PER_SEC, i.e. microseconds. (Linux is also Posix
conform in this respect.)

I use std::clock() as well,
margin of error of close to 10 milliseconds, though.

Historically, the granularity was the number of ticks. This
certainly isn't the case today, and I don't know of any system
which really gives microsecond granularity. (Historically, on
the first systems I used, CLOCKS_PER_SEC was 50 in Europe, and
60 in America. Which was the granularity.)

--
James Kanze (GABI Software) email:ja*********@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]