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138 lines
2.7 KiB
138 lines
2.7 KiB
15 years ago
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/*
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Copyright (C) 2000-2002 Stefan Westerfeld
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stefan@space.twc.de
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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*/
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#include "cpuusage.h"
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#include "dispatcher.h"
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#include "debug.h"
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#include <time.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <iostream>
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using namespace std;
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namespace Arts {
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class Benchmark
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{
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private:
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struct timeval _start,_stop;
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public:
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void start()
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{
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gettimeofday(&_start,NULL);
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}
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float stop()
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{
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gettimeofday(&_stop,NULL);
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float diff = _stop.tv_sec-_start.tv_sec;
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diff += (float)(_stop.tv_usec-_start.tv_usec)/1000000;
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return diff;
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}
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};
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class CPUUsagePrivate
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{
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public:
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clock_t oldclock;
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int stalled;
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float usage;
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Benchmark b;
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};
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/** signal handlers **/
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static CPUUsage *cpuUsage = 0;
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extern "C" void cpuUsageCheck(int)
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{
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if(cpuUsage != 0)
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cpuUsage->check();
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signal(SIGALRM, cpuUsageCheck);
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}
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/** main stuff **/
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CPUUsage::CPUUsage() : d(new CPUUsagePrivate())
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{
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d->oldclock = clock();
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d->usage = 0;
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d->stalled = 0;
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d->b.start();
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cpuUsage = this;
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/* setup signal handler & timer */
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struct itimerval oldvalue;
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struct itimerval newvalue = {{ 1, 0 }, {1, 0}}; // 1 second
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setitimer(ITIMER_REAL, &newvalue, &oldvalue);
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signal(SIGALRM, cpuUsageCheck);
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}
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CPUUsage::~CPUUsage()
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{
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delete d;
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cpuUsage = 0;
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}
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float CPUUsage::usage()
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{
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return d->usage;
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}
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void CPUUsage::check()
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{
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float cpu_time = (clock()-d->oldclock)/(float)CLOCKS_PER_SEC;
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float real_time = d->b.stop();
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if(cpu_time > 0 && real_time > 0) // there may be wraparounds
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{
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d->usage = cpu_time / real_time;
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if(d->usage > 0.95) // more than 95% -> not good! (probably freeze)
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d->stalled++;
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else
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d->stalled=0;
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// ok, cancel synthesis due to cpu overload! brutal method
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if(d->stalled > 15)
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arts_fatal("cpu overload, aborting");
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}
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// prepare for next checkpoint
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d->oldclock = clock();
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d->b.start();
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}
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CPUUsage *CPUUsage::the()
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{
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return cpuUsage;
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}
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}
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