Timing function call

[Guest]

Hi all,
I have a function in C++/CLI that calls a native C++ function.
I want the C++/CLI function to measure the time between the call to the
unmanaged function and the return to the managed function.

Can anyone point me in the right direction?
I don`t really know where to start and have not found anything on google or
MSDN NGs.

Thanks!

 

[Guest]

You can use the Stopwatch class to do that very easily. See MSDN for more info.

A note of caution if you want to use ns precision:
(From this thread:
http://groups.google.com/group/micr...7c46/6f3c2bcaba6ff09c?&hl=en#6f3c2bcaba6ff09c
)

"One should not use Elapsed.Ticks to calculate the elapsed time in
nanoseconds.
The only correct way to get this high precision count is by using
Stopwatch.ElapsedTicks like this:
long nanosecPerTick = (1000L*1000L*1000L) / Stopwatch.Frequency;
....
long ticks = sw.ElapsedTicks;
Console.WriteLine("{0} nanoseconds", ticks * nanosecPerTick);
or use Stopwatch.ElapsedMiliseconds.

 

[Carl Daniel [VC++ MVP]]

You can use the Stopwatch class to do that very easily. See MSDN for more
info.

A note of caution if you want to use ns precision:
(From this thread:
http://groups.google.com/group/micr...7c46/6f3c2bcaba6ff09c?&hl=en#6f3c2bcaba6ff09c
)

"One should not use Elapsed.Ticks to calculate the elapsed time in
nanoseconds.
The only correct way to get this high precision count is by using
Stopwatch.ElapsedTicks like this:

<G> Been there, done that. Brilliant design that Stopwatch.Elapsed.Ticks
and Stopwatch.ElapsedTicks are both valid but have radically different
meanings.

-cd

 

[Guest]

Worked like a charme.
Thank you.