Re: Is there a faster hi resolution timer for diy profiling

"Willy Denoyette [MVP]" <willy.denoyette@xxxxxxxxxx> wrote in message
news:%23pkHBg8VIHA.4740@xxxxxxxxxxxxxxxxxxxxxxx
"Willy Denoyette [MVP]" <willy.denoyette@xxxxxxxxxx> wrote in message

// C function that uses an intrinsic to retrieve the Processor's cycle
counter register
// Beware your CPU may not support this!
// Compile from the command line: cl /EHsc /O2 <thisfile.cpp>
#include <intrin.h>
#pragma intrinsic(__rdtsc)
extern "C"
__declspec(dllexport) unsigned __int64 __stdcall rdtsc()
{
return __rdtsc();
}


// C#
[DllImport("thisfile.dll"),SuppressUnmanagedCodeSecurity]
static extern ulong rdtsc();

...
ulong cycles = rdtsc();

Willy.

thanks that worked, however it stil takes 9000 clock cycles
wich I think is roughly about the same time ...
is that PInvoke realy so time consuming ?
what does it have todo ?

thanks
Colin =^.^=


.

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