/*
* public double GetCurrentFrequency()
* {
* ulong mask = 1UL << Thread;
* ulong start_tsc, stop_tsc;
* ulong start_pmc, stop_pmc;
* ThreadAffinity.Set(mask);
* if (GetPMCTSC(out start_pmc, out start_tsc))
* {
* System.Threading.Thread.Sleep(30);
* ThreadAffinity.Set(mask);
* if (GetPMCTSC(out stop_pmc, out stop_tsc))
* {
* return (double)(stop_pmc - start_pmc) / (stop_tsc - start_tsc);
* }
* }
* ThreadAffinity.Set(mask);
* return 0;
* }
*/
public double Frequency()
{
ulong mask = 1UL << Thread;
ThreadAffinity.Set(mask);
EstimatePerformanceMonitoringCounterFrequency(out double outFreq, out double outError);
ThreadAffinity.Set(mask);
return(outFreq);
}
public double GetCurrentFrequency()
{
ulong mask = 1UL << Thread;
ulong mcnt_start, acnt_start, mcnt_stop, acnt_stop;
uint eax_m = 0, edx_m = 0, eax_a = 0, edx_a = 0;
int cnt = 0;
ThreadAffinity.Set(mask);
while (_ols.RdmsrTx(0xe8, ref eax_a, ref edx_a, pthread) == 0 || _ols.RdmsrTx(0xe7, ref eax_m, ref edx_m, pthread) == 0)
{
if (cnt < 4)
{
cnt++;
}
else
{
return(0);
}
}
mcnt_start = ((ulong)edx_m << 32) + eax_m;
acnt_start = ((ulong)edx_a << 32) + eax_a;
cnt = 0;
System.Threading.Thread.Sleep(30);
while (_ols.RdmsrTx(0xe8, ref eax_a, ref edx_a, pthread) == 0 || _ols.RdmsrTx(0xe7, ref eax_m, ref edx_m, pthread) == 0)
{
if (cnt < 4)
{
cnt++;
}
else
{
return(0);
}
}
mcnt_stop = ((ulong)edx_m << 32) + eax_m;
acnt_stop = ((ulong)edx_a << 32) + eax_a;
ThreadAffinity.Set(mask);
return(2.7 * (acnt_stop - acnt_start) / (mcnt_stop - mcnt_start));
}