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/*
Copyright (C) 2000-2002 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "cpuusage.h"
#include "dispatcher.h"
#include "debug.h"
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <signal.h>
#include <iostream>
using namespace std;
namespace Arts {
class Benchmark
{
private:
struct timeval _start,_stop;
public:
void start()
{
gettimeofday(&_start,NULL);
}
float stop()
{
gettimeofday(&_stop,NULL);
float diff = _stop.tv_sec-_start.tv_sec;
diff += (float)(_stop.tv_usec-_start.tv_usec)/1000000;
return diff;
}
};
class CPUUsagePrivate
{
public:
clock_t oldclock;
int stalled;
float usage;
Benchmark b;
};
/** signal handlers **/
static CPUUsage *cpuUsage = 0;
extern "C" void cpuUsageCheck(int)
{
if(cpuUsage != 0)
cpuUsage->check();
signal(SIGALRM, cpuUsageCheck);
}
/** main stuff **/
CPUUsage::CPUUsage() : d(new CPUUsagePrivate())
{
d->oldclock = clock();
d->usage = 0;
d->stalled = 0;
d->b.start();
cpuUsage = this;
/* setup signal handler & timer */
struct itimerval oldvalue;
struct itimerval newvalue = {{ 1, 0 }, {1, 0}}; // 1 second
setitimer(ITIMER_REAL, &newvalue, &oldvalue);
signal(SIGALRM, cpuUsageCheck);
}
CPUUsage::~CPUUsage()
{
delete d;
cpuUsage = 0;
}
float CPUUsage::usage()
{
return d->usage;
}
void CPUUsage::check()
{
float cpu_time = (clock()-d->oldclock)/(float)CLOCKS_PER_SEC;
float real_time = d->b.stop();
if(cpu_time > 0 && real_time > 0) // there may be wraparounds
{
d->usage = cpu_time / real_time;
if(d->usage > 0.95) // more than 95% -> not good! (probably freeze)
d->stalled++;
else
d->stalled=0;
// ok, cancel synthesis due to cpu overload! brutal method
if(d->stalled > 15)
arts_fatal("cpu overload, aborting");
}
// prepare for next checkpoint
d->oldclock = clock();
d->b.start();
}
CPUUsage *CPUUsage::the()
{
return cpuUsage;
}
}
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