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// -*- C++ -*-
/***************************************************************************
* blitz/Timer.h Timer class, for use in benchmarking
*
* $Id$
*
* Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org>
*
* This file is a part of Blitz.
*
* Blitz is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Blitz 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Blitz. If not, see <http://www.gnu.org/licenses/>.
*
* Suggestions: blitz-devel@lists.sourceforge.net
* Bugs: blitz-support@lists.sourceforge.net
*
* For more information, please see the Blitz++ Home Page:
* https://sourceforge.net/projects/blitz/
*
***************************************************************************/
// This class is not portable to non System V platforms.
// It will need to be rewritten for Windows, NT, Mac.
// NEEDS_WORK
#ifndef BZ_TIMER_H
#define BZ_TIMER_H
#ifndef BZ_BLITZ_H
#include <blitz/blitz.h>
#endif
#ifdef BZ_HAVE_RUSAGE
#include <sys/resource.h>
#else
#include <time.h>
#endif
BZ_NAMESPACE(blitz)
#ifndef BZ_HAVE_LIBPAPI
class Timer {
public:
Timer()
{
state_ = uninitialized;
}
void start()
{
state_ = running;
t1_ = systemTime();
}
void stop()
{
t2_ = systemTime();
BZPRECONDITION(state_ == running);
state_ = stopped;
}
/* Compaq cxx compiler in ansi mode cannot print out long double type! */
#if defined(__DECCXX)
double elapsed() const
#else
/** Return elapsed time in seconds. */
double elapsed() const
#endif
{
BZPRECONDITION(state_ == stopped);
return (t2_ - t1_)/1e6;
}
long long instr() const { return 0; };
long long flops() const { return 0; };
static const string& indep_var() { return ivar_; };
private:
Timer(Timer&) { }
void operator=(Timer&) { }
long int systemTime()
{
#ifdef BZ_HAVE_RUSAGE
getrusage(RUSAGE_SELF, &resourceUsage_);
long int sec = resourceUsage_.ru_utime.tv_sec
+ resourceUsage_.ru_stime.tv_sec;
long int usec = resourceUsage_.ru_utime.tv_usec
+ resourceUsage_.ru_stime.tv_usec;
return sec*1000000+usec;
#else
return 1000000*clock() / (long int) CLOCKS_PER_SEC;
#endif
}
enum { uninitialized, running, stopped } state_;
static const string ivar_;
#ifdef BZ_HAVE_RUSAGE
struct rusage resourceUsage_;
#endif
long int t1_, t2_;
};
#else
// implementation using PAPI performance counters
#include <papi.h>
class Timer {
public:
Timer()
{
// maybe overhead is less from just reading counters
if(PAPI_start_counters((int*)Events, nevents)!=PAPI_OK) {
cerr << "Error starting counters\n";
}
state_ = uninitialized;
}
~Timer()
{
PAPI_stop_counters(counters_.data(), nevents);
}
void start()
{
state_ = running;
// this resets the counters
PAPI_read_counters(counters_.data(), nevents);
}
void stop()
{
PAPI_read_counters(counters_.data(), nevents);
BZPRECONDITION(state_ == running);
state_ = stopped;
}
/** since we don't know the clock frequency of the processor, we
instead output "flops/clock cycle" which seems like a better
measure of code performance and not machine performance. */
long long elapsed() const
{
BZPRECONDITION(state_ == stopped);
return counters_[0];
}
long long instr() const { return counters_[1]; };
long long flops() const { return counters_[2]; };
static const string& indep_var() { return ivar_; };
private:
Timer(Timer&) { }
void operator=(Timer&) { }
enum { uninitialized, running, stopped } state_;
static const int nevents=3;
static const int Events[nevents];
static const string ivar_;
TinyVector<long long, nevents> counters_;
};
#endif
BZ_NAMESPACE_END
#endif // BZ_TIMER_H
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