132 lines
2.8 KiB
C++
132 lines
2.8 KiB
C++
/*
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* Copyright (C) 2006-2016 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2009 David Robillard <d@drobilla.net>
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* Copyright (C) 2014-2015 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <cstdio>
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#include <fstream>
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#include "pbd/error.h"
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#include "ardour/cycle_timer.h"
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#include "ardour/libardour_visibility.h"
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#include "pbd/i18n.h"
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using namespace std;
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using namespace PBD;
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float CycleTimer::cycles_per_usec = 0;
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float
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get_mhz()
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{
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FILE *f;
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if ((f = fopen("/proc/cpuinfo", "r")) == 0) {
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fatal << _("CycleTimer::get_mhz(): can't open /proc/cpuinfo") << endmsg;
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abort(); /*NOTREACHED*/
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return 0.0f;
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}
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while (true) {
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float mhz;
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int ret;
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char buf[1000];
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if (fgets (buf, sizeof(buf), f) == 0) {
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fatal << _("CycleTimer::get_mhz(): cannot locate cpu MHz in /proc/cpuinfo") << endmsg;
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abort(); /*NOTREACHED*/
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return 0.0f;
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}
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#ifdef __powerpc__
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int imhz;
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/* why can't the PPC crew standardize their /proc/cpuinfo format ? */
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ret = sscanf (buf, "clock\t: %dMHz", &imhz);
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mhz = (float) imhz;
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#else /* XXX don't assume its x86 just because its not power pc */
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ret = sscanf (buf, "cpu MHz : %f", &mhz);
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#endif
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if (ret == 1) {
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fclose(f);
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return mhz;
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}
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}
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fatal << _("cannot locate cpu MHz in /proc/cpuinfo") << endmsg;
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abort(); /*NOTREACHED*/
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return 0.0f;
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}
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StoringTimer::StoringTimer (int N)
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{
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_point = new int[N];
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_value = new cycles_t[N];
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_ref = new cycles_t[N];
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_max_points = N;
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_points = 0;
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}
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#ifndef NDEBUG
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void
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StoringTimer::dump (string const & file)
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{
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ofstream f (file.c_str ());
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f << min (_points, _max_points) << "\n";
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f << get_mhz () << "\n";
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for (int i = 0; i < min (_points, _max_points); ++i) {
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f << _point[i] << " " << _ref[i] << " " << _value[i] << "\n";
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}
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}
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#endif
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void
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StoringTimer::ref ()
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{
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_current_ref = get_cycles ();
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}
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void
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StoringTimer::check (int p)
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{
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if (_points == _max_points) {
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++_points;
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return;
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} else if (_points > _max_points) {
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return;
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}
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_point[_points] = p;
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_value[_points] = get_cycles ();
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_ref[_points] = _current_ref;
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++_points;
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}
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#ifdef PT_TIMING
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StoringTimer ST (64 * 1024);
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#endif
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