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https://port.numenaute.org/aleajactaest/khanat-code-old.git
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Added: Function and tool to check system timer sanity across cpu cores
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5 changed files with 198 additions and 0 deletions
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@ -48,6 +48,19 @@ typedef sint64 TTicks;
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class CTime
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{
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public:
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struct CTimerInfo
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{
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/// Returns if there is a high precision timer that can be used.
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bool IsHighPrecisionAvailable;
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/// If a CPU specific timer is used and the values are not consistent accross threads.
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bool RequiresSingleCore;
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/// The resolution of the high resolution timer.
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TTicks HighPrecisionResolution;
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};
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/** Get advanced information on the used timers.
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*/
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static void probeTimerInfo(CTimerInfo &result);
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/** Return the number of second since midnight (00:00:00), January 1, 1970,
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* coordinated universal time, according to the system clock.
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@ -32,9 +32,145 @@
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#include "nel/misc/time_nl.h"
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#include "nel/misc/sstring.h"
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#include <nel/misc/thread.h>
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namespace NLMISC
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{
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void CTime::probeTimerInfo(CTime::CTimerInfo &result)
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{
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breakable
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{
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#ifdef NL_OS_WINDOWS
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LARGE_INTEGER winPerfFreq;
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LARGE_INTEGER winPerfCount;
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DWORD lowResTime;
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if (!QueryPerformanceFrequency(&winPerfFreq))
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{
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nldebug("Cannot query performance frequency");
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result.IsHighPrecisionAvailable = false;
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}
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else
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{
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result.HighPrecisionResolution = winPerfFreq.QuadPart;
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}
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if (winPerfFreq.QuadPart == 1000)
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{
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nldebug("Higher precision timer not available, OS defaulted to GetTickCount");
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result.IsHighPrecisionAvailable = false;
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}
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if (!QueryPerformanceCounter(&winPerfCount))
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{
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nldebug("Cannot query performance counter");
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result.IsHighPrecisionAvailable = false;
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result.HighPrecisionResolution = 1000;
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}
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if (!result.IsHighPrecisionAvailable)
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{
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lowResTime = timeGetTime();
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}
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#else
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// nldebug("Probe of timer info not implemented");
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result.IsHighPrecisionAvailable = false;
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result.RequiresSingleCore = true;
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break;
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#endif
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uint64 cpuMask = IProcess::getCurrentProcess()->getCPUMask();
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uint64 threadMask = IThread::getCurrentThread()->getCPUMask();
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#ifdef NL_OS_WINDOWS
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#else
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TTicks timerFrequency = 0;
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#endif
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uint identical = 0; // Identical stamps may indicate the os handling backwards glitches.
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uint backwards = 0; // Happens when the timers are not always in sync and the implementation is faulty.
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uint regular = 0; // How many times the number advanced normally.
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uint skipping = 0; // Does not really mean anything necessarily.
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uint frequencybug = 0; // Should never happen.
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// uint badcore = 0; // Affinity does not work.
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// Cycle 32 times trough all cores, and verify if the timing remains consistent.
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for (uint i = 32; i; --i)
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{
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uint64 currentBit = 1;
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for (uint j = 64; j; --j)
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{
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if (cpuMask & currentBit)
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{
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IThread::getCurrentThread()->setCPUMask(currentBit);
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#ifdef NL_OS_WINDOWS
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// Make sure the thread is rescheduled.
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SwitchToThread();
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Sleep(0);
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// Verify the core
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/* Can only verify on 2003, Vista and higher.
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if (1 << GetCurrentProcessorNumber() != currentBit)
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++badcore;
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*/
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// Check if the timer is still sane.
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if (result.IsHighPrecisionAvailable)
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{
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LARGE_INTEGER winPerfFreqN;
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LARGE_INTEGER winPerfCountN;
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QueryPerformanceFrequency(&winPerfFreqN);
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if (winPerfFreqN.QuadPart != winPerfFreq.QuadPart)
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++frequencybug;
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QueryPerformanceCounter(&winPerfCountN);
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if (winPerfCountN.QuadPart == winPerfCount.QuadPart)
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++identical;
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if (winPerfCountN.QuadPart < winPerfCount.QuadPart || winPerfCountN.QuadPart - winPerfCount.QuadPart < 0)
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++backwards;
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if (winPerfCountN.QuadPart - winPerfCount.QuadPart > winPerfFreq.QuadPart / 20) // 50ms skipping check
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++skipping;
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else if (winPerfCountN.QuadPart > winPerfCount.QuadPart)
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++regular;
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winPerfCount.QuadPart = winPerfCountN.QuadPart;
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}
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else
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{
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DWORD lowResTimeN;
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lowResTimeN = timeGetTime();
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if (lowResTimeN == lowResTime)
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++identical;
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if (lowResTimeN < lowResTime || lowResTimeN - lowResTime < 0)
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++backwards;
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if (lowResTimeN - lowResTime > 50)
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++skipping;
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else if (lowResTimeN > lowResTime)
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++regular;
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lowResTime = lowResTimeN;
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}
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#endif
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}
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currentBit <<= 1;
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}
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}
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IThread::getCurrentThread()->setCPUMask(threadMask);
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nldebug("Timer resolution: %i Hz", (int)(result.HighPrecisionResolution));
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nldebug("Time identical: %i, backwards: %i, regular: %i, skipping: %i, frequency bug: %i", identical, backwards, regular, skipping, frequencybug);
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if (identical > regular)
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nlwarning("The system timer is of relatively low resolution, you may experience issues");
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if (backwards > 0 || frequencybug > 0)
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{
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nlwarning("The current system timer is not reliable across multiple cpu cores");
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result.RequiresSingleCore = true;
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}
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else result.RequiresSingleCore = false;
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if (result.HighPrecisionResolution == 14318180)
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nldebug("Detected known HPET era timer frequency");
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if (result.HighPrecisionResolution == 3579545)
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nldebug("Detected known AHCI era timer frequency");
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if (result.HighPrecisionResolution == 1193182)
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nldebug("Detected known i8253/i8254 era timer frequency");
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}
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}
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/* Return the number of second since midnight (00:00:00), January 1, 1970,
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* coordinated universal time, according to the system clock.
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* This values is the same on all computer if computers are synchronized (with NTP for example).
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@ -18,3 +18,5 @@ IF(WIN32)
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ADD_SUBDIRECTORY(words_dic)
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ENDIF(MFC_FOUND)
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ENDIF(WIN32)
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ADD_SUBDIRECTORY(probe_timers)
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9
code/nel/tools/misc/probe_timers/CMakeLists.txt
Normal file
9
code/nel/tools/misc/probe_timers/CMakeLists.txt
Normal file
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@ -0,0 +1,9 @@
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FILE(GLOB SRC *.cpp)
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ADD_EXECUTABLE(nl_probe_timers ${SRC})
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TARGET_LINK_LIBRARIES(nl_probe_timers nelmisc)
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NL_DEFAULT_PROPS(nl_probe_timers "NeL, Tools, Misc: Probe Timers")
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NL_ADD_RUNTIME_FLAGS(nl_probe_timers)
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INSTALL(TARGETS nl_probe_timers RUNTIME DESTINATION bin COMPONENT toolsmisc)
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38
code/nel/tools/misc/probe_timers/main.cpp
Normal file
38
code/nel/tools/misc/probe_timers/main.cpp
Normal file
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@ -0,0 +1,38 @@
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// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2012 by authors
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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 Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include "nel/misc/types_nl.h"
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#include "nel/misc/time_nl.h"
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using namespace NLMISC;
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int main (int argc, char **argv)
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{
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for (uint i = 0; i < 8; ++i)
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{
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CTime::CTimerInfo timerInfo;
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CTime::probeTimerInfo(timerInfo);
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}
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printf ("\nPress <return> to exit\n");
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getchar ();
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return EXIT_SUCCESS;
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}
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