https://github.com/cran/Rcpp
Tip revision: 7e820534c24608b5b41f0c1927ebe114d214cab7 authored by Dirk Eddelbuettel on 23 March 2013, 00:00:00 UTC
version 0.10.3
version 0.10.3
Tip revision: 7e82053
Timer.cpp
// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Timer.cpp: Rcpp R/C++ interface class library -- Rcpp benchmark utility
//
// Copyright (C) 2012 JJ Allaire, Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#include <Rcpp.h>
#include <Rcpp/Benchmark/Timer.h>
#if defined(_WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#elif defined(__APPLE__)
#include <mach/mach_time.h>
#elif defined(linux) || defined(__linux) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__GLIBC__) || defined(__GNU__)
#include <time.h>
#elif defined(sun) || defined(__sun) || defined(_AIX)
#include <sys/time.h>
#else /* Unsupported OS */
#error "Rcpp::Timer not supported by your OS."
#endif
namespace Rcpp{
#if defined(_WIN32)
nanotime_t get_nanotime(void) {
LARGE_INTEGER time_var, frequency;
QueryPerformanceCounter(&time_var);
QueryPerformanceFrequency(&frequency);
/* Convert to nanoseconds */
return 1.0e9 * time_var.QuadPart / frequency.QuadPart;
}
#elif defined(__APPLE__)
nanotime_t get_nanotime(void) {
nanotime_t time;
mach_timebase_info_data_t info;
time = mach_absolute_time();
mach_timebase_info(&info);
/* Convert to nanoseconds */
return time * (info.numer / info.denom);
}
#elif defined(linux) || defined(__linux) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__GLIBC__) || defined(__GNU__)
static const nanotime_t nanoseconds_in_second = static_cast<nanotime_t>(1000000000.0);
nanotime_t get_nanotime(void) {
struct timespec time_var;
/* Possible other values we could have used are CLOCK_MONOTONIC,
* which is takes longer to retrieve and CLOCK_PROCESS_CPUTIME_ID
* which, if I understand it correctly, would require the R
* process to be bound to one core.
*/
clock_gettime(CLOCK_REALTIME, &time_var);
nanotime_t sec = time_var.tv_sec;
nanotime_t nsec = time_var.tv_nsec;
/* Combine both values to one nanoseconds value */
return (nanoseconds_in_second * sec) + nsec;
}
#elif defined(sun) || defined(__sun) || defined(_AIX)
/* short an sweet! */
nanotime_t get_nanotime(void) {
return gethrtime();
}
#else /* Unsupported OS */
#error "Rcpp::Benchmark::Timer not supported by your OS."
#endif
Timer::Timer() : data(), start_time( get_nanotime() ){}
void Timer::step( const std::string& name){
nanotime_t now = get_nanotime() ;
data.push_back( std::make_pair( name, now - start_time ) ) ;
start_time = get_nanotime() ;
}
namespace{
std::string get_first( const std::pair<std::string,nanotime_t>& pair ){
return pair.first ;
}
double get_second( const std::pair<std::string,nanotime_t>& pair ){
return static_cast<double>(pair.second) ;
}
}
Timer::operator SEXP() const {
NumericVector out( data.begin(), data.end(), get_second ) ;
CharacterVector names( data.begin(), data.end(), get_first ) ;
out.attr( "names" ) = names ;
return out ;
}
}