high performance counter?

[hydro]

i need a high performance counter for my programm
i wanted it to be crossplattform ... but thats the problem ...

so can somebody give me good counters for windows and linux
(plz several .. for choice .. or with pro and contra ...)

i know QueryPerformanceCounter for windows ... but thats it =)

would be nice if u post the frequency of the counter ... (and how to get it in code)

[Hobson]

Maybe you will find something interesting here: http://www.codeguru.com/forum/showth...hreadid=291294

[Andreas Masur]

Well...there is basically no portable way since it depends on the underlying API...

[dude_1967]

hydro,

Indeed it is platform dependent. The following example might be useful for IA32 x86 with MSVC and GCC.

The example has some related stuff from the class, but it's pretty clear how to deal with the assembly dialects alone.

Good luck, Chris.

const ef_UINT64 e_float_cpu_ia32::tick(void) const
{
  if(!supported())
  {
    return 0;
  }
  else
  {
    volatile ef_UINT32 lo = 0;
    volatile ef_UINT32 hi = 0;

    #if defined(USE_INTEL_x86_SYSTEM)
    
      #if defined(_MSC_VER)

        __asm
        {
          xor eax, eax
          cpuid
          rdtsc
          mov dword ptr lo, eax
          mov dword ptr hi, edx
        }

      #elif defined(__GNUC__)
      
        asm volatile("xorl %%eax, %%eax\n"
                     "cpuid\n"
                     "rdtsc\n"
                     "movl %%eax, %0\n"
                     "movl %%edx, %1" : "=g" (lo), "=g" (hi) : : "eax", "edx");

      #endif
    
    #endif

    return (static_cast<ef_UINT64>(hi) << 32) | lo;
  }
}

[dude_1967]

... it's basically some of the stuff from the FAQ but augmented for GCC as well.

Chris.