mirror of
https://github.com/EQEmu/Server.git
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169 lines
3.4 KiB
C++
169 lines
3.4 KiB
C++
/* EQEMu: Everquest Server Emulator
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Copyright (C) 2001-2006 EQEMu Development Team (http://eqemulator.net)
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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; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY except by those people which sell it, which
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are required to give you total support for your newly bought product;
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without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "debug.h"
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#include "rdtsc.h"
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#include "types.h"
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#include <stdio.h>
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#ifdef _WINDOWS
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#include <sys/timeb.h>
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#include "../common/timer.h"
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#else
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#include <unistd.h>
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#include <sys/time.h>
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#endif
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#ifdef i386
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#define USE_RDTSC
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#endif
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bool RDTSC_Timer::_inited = false;
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int64 RDTSC_Timer::_ticsperms = 0;
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RDTSC_Timer::RDTSC_Timer() {
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if(!_inited) {
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//find our clock rate
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RDTSC_Timer::init();
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}
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_start = 0;
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_end = 0;
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}
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RDTSC_Timer::RDTSC_Timer(bool start_it) {
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if(!_inited) {
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//find our clock rate
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RDTSC_Timer::init();
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}
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if(start_it)
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start();
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else {
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_start = 0;
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_end = 0;
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}
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}
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int64 RDTSC_Timer::rdtsc() {
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int64 res = 0;
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#ifdef USE_RDTSC
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#ifndef WIN64
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#ifdef WIN32
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//untested!
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unsigned long highw, loww;
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__asm {
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push eax
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push edx
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rdtsc
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mov highw, eax
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mov loww, edx
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pop edx
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pop eax
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}
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res = ((int64)highw)<<32 | loww;
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#else
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//gnu version
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__asm__ __volatile__ ("rdtsc" : "=A" (res));
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#endif
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#else
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//fall back to get time of day
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timeval t;
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gettimeofday(&t, nullptr);
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res = ((int64)t.tv_sec) * 1000 + t.tv_usec;
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#endif
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#endif
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return(res);
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}
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void RDTSC_Timer::init() {
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#ifdef USE_RDTSC
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int64 before, after, sum;
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int r;
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sum = 0;
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// run an average to increase accuracy of clock rate
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for(r = 0; r < CALIBRATE_LOOPS; r++) {
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before = rdtsc();
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//sleep a know duration to figure out clock rate
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#ifdef _WINDOWS
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Sleep(SLEEP_TIME);
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#else
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usleep(SLEEP_TIME * 1000); //ms * 1000
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#endif
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after = rdtsc();
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sum += after - before;
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}
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//ticks per sleep / ms per sleep
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_ticsperms = (sum / CALIBRATE_LOOPS) / SLEEP_TIME;
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#else
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//if using gettimeofday, this is fixed at 1000
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_ticsperms = 1000;
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#endif
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// printf("Tics per milisecond: %llu \n", _ticsperms);
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_inited = true; //only want to do this once
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}
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//start the timer
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void RDTSC_Timer::start() {
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_start = rdtsc();
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_end = 0;
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}
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//stop the timer
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void RDTSC_Timer::stop() {
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_end = rdtsc();
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}
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//calculate the elapsed duration
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double RDTSC_Timer::getDuration() {
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return(((double)(getTicks())) / double(_ticsperms));
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}
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RDTSC_Collector::RDTSC_Collector() : RDTSC_Timer() {
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reset();
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}
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RDTSC_Collector::RDTSC_Collector(bool start_it) : RDTSC_Timer(start_it) {
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reset();
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}
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void RDTSC_Collector::stop() {
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RDTSC_Timer::stop();
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_sum += RDTSC_Timer::getTicks();
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_count++;
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}
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//calculate the elapsed duration
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double RDTSC_Collector::getTotalDuration() {
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return(((double)(getTotalTicks())) / double(_ticsperms));
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}
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double RDTSC_Collector::getAverage() {
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return(((double)(getTotalTicks())) / double(_ticsperms * _count));
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}
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void RDTSC_Collector::reset() {
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_sum = 0;
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_count = 0;
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}
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