We help IT Professionals succeed at work.

Taking time measurements

Lescha
Lescha asked
on
225 Views
Last Modified: 2013-11-15
I need to make exact (with at least 0.01 sec) time measurements. Is there a normal function to do that, like there is "tic" and "toc" in Matlab?

If the answer involves MFC, tell me so in a comment, I will erase this question and repost it into that appropriate section.

What I mean is:

<start timer>
<make a run>
<stop timer>
Comment
Watch Question

CERTIFIED EXPERT
Top Expert 2012
Commented:
This one is on us!
(Get your first solution completely free - no credit card required)
UNLOCK SOLUTION
jkr
CERTIFIED EXPERT
Top Expert 2012

Commented:
To elaborate - a call to 'GetTickCount()' returns the number of milliseconds that have elapsed since Windows was started. So if you want to measure the amount of time a certain operation takes, use

DWORD dwBefore;
DWORD dwAfter;
DWORD dwMillisecondsElapsed;

dwBefore = GetTickCount();

// processing here...

dwAfter = GetTickCount();

dwMillisecondsElapsed = dwAfter - dwBefore;

Commented:
The problem with that  (well actually with ANY solution, so no criticism of what jkr said) is that windows is a mult-tasking system so high precission timing at the application level is not possible.  If your app is suspended fir 1/2 second during the run you don't have 0.1 accuracy.  

There are things that can be done to make timing more reliable, but you will still find that it isn't perfect.
jkr
CERTIFIED EXPERT
Top Expert 2012

Commented:
A little bit 'off topic' -  I seem to have some trouble with email notifications (haven't even been informed about nietod's comment by now), is anybody else experiencing this also?

Commented:
I didn't get an e-mail about my comment either.  :-)

I got yours though.

Author

Commented:
Thanks, "jkr", "nietod".

As to notifications: no problem here, I received them all. Maybe some temporary problem on your server, "jkr"?

Lescha
jkr
CERTIFIED EXPERT
Top Expert 2012

Commented:
>>Maybe some temporary problem on your
>>server

I hope so - but when there's a problem, it is not due to *my* server, as it is next to me... but maybe a unreliable relay host in between...

Author

Commented:
Both for "jkr" and "nietod" - I don't know of any other way to attract your attention to a very interesting problem I've been trying to solve for several months now. Please take a look at this question:

https://www.experts-exchange.com/jsp/qShow.jsp?ta=mfc&qid=10266344 

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.