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/** @file kmp_stats_timing.cpp
* Timing functions
*/
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//
#include <stdlib.h>
#include <unistd.h>
#include <iostream>
#include <iomanip>
#include <sstream>
#include "kmp.h"
#include "kmp_stats_timing.h"
using namespace std;
#if KMP_HAVE_TICK_TIME
# if KMP_MIC
double tsc_tick_count::tick_time()
{
// pretty bad assumption of 1GHz clock for MIC
return 1/((double)1000*1.e6);
}
# elif KMP_ARCH_X86 || KMP_ARCH_X86_64
# include <string.h>
// Extract the value from the CPUID information
double tsc_tick_count::tick_time()
{
static double result = 0.0;
if (result == 0.0)
{
kmp_cpuid_t cpuinfo;
char brand[256];
__kmp_x86_cpuid(0x80000000, 0, &cpuinfo);
memset(brand, 0, sizeof(brand));
int ids = cpuinfo.eax;
for (unsigned int i=2; i<(ids^0x80000000)+2; i++)
__kmp_x86_cpuid(i | 0x80000000, 0, (kmp_cpuid_t*)(brand+(i-2)*sizeof(kmp_cpuid_t)));
char * start = &brand[0];
for (;*start == ' '; start++)
;
char * end = brand + KMP_STRLEN(brand) - 3;
uint64_t multiplier;
if (*end == 'M') multiplier = 1000LL*1000LL;
else if (*end == 'G') multiplier = 1000LL*1000LL*1000LL;
else if (*end == 'T') multiplier = 1000LL*1000LL*1000LL*1000LL;
else
{
cout << "Error determining multiplier '" << *end << "'\n";
exit (-1);
}
*end = 0;
while (*end != ' ') end--;
end++;
double freq = strtod(end, &start);
if (freq == 0.0)
{
cout << "Error calculating frequency " << end << "\n";
exit (-1);
}
result = ((double)1.0)/(freq * multiplier);
}
return result;
}
# endif
#endif
static bool useSI = true;
// Return a formatted string after normalising the value into
// engineering style and using a suitable unit prefix (e.g. ms, us, ns).
std::string formatSI(double interval, int width, char unit)
{
std::stringstream os;
if (useSI)
{
// Preserve accuracy for small numbers, since we only multiply and the positive powers
// of ten are precisely representable.
static struct { double scale; char prefix; } ranges[] = {
{1.e12,'f'},
{1.e9, 'p'},
{1.e6, 'n'},
{1.e3, 'u'},
{1.0, 'm'},
{1.e-3,' '},
{1.e-6,'k'},
{1.e-9,'M'},
{1.e-12,'G'},
{1.e-15,'T'},
{1.e-18,'P'},
{1.e-21,'E'},
{1.e-24,'Z'},
{1.e-27,'Y'}
};
if (interval == 0.0)
{
os << std::setw(width-3) << std::right << "0.00" << std::setw(3) << unit;
return os.str();
}
bool negative = false;
if (interval < 0.0)
{
negative = true;
interval = -interval;
}
for (int i=0; i<(int)(sizeof(ranges)/sizeof(ranges[0])); i++)
{
if (interval*ranges[i].scale < 1.e0)
{
interval = interval * 1000.e0 * ranges[i].scale;
os << std::fixed << std::setprecision(2) << std::setw(width-3) << std::right <<
(negative ? -interval : interval) << std::setw(2) << ranges[i].prefix << std::setw(1) << unit;
return os.str();
}
}
}
os << std::setprecision(2) << std::fixed << std::right << std::setw(width-3) << interval << std::setw(3) << unit;
return os.str();
}
tsc_tick_count::tsc_interval_t computeLastInLastOutInterval(timePair * times, int nTimes)
{
timePair lastTimes = times[0];
tsc_tick_count * startp = lastTimes.get_startp();
tsc_tick_count * endp = lastTimes.get_endp();
for (int i=1; i<nTimes; i++)
{
(*startp) = startp->later(times[i].get_start());
(*endp) = endp->later (times[i].get_end());
}
return lastTimes.duration();
}
std::string timePair::format() const
{
std::ostringstream oss;
oss << start.getValue() << ":" << end.getValue() << " = " << (end-start).getValue();
return oss.str();
}
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