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/**
* @file llfasttimer.cpp
* @brief Implementation of the fast timer.
*
* $LicenseInfo:firstyear=2004&license=viewergpl$
*
* Copyright (c) 2004-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llfasttimer.h"
#include "llprocessor.h"
#if LL_WINDOWS
#elif LL_LINUX || LL_SOLARIS
#include <sys/time.h>
#include <sched.h>
#elif LL_DARWIN
#include <sys/time.h>
#include "lltimer.h" // get_clock_count()
#else
#error "architecture not supported"
#endif
//////////////////////////////////////////////////////////////////////////////
// statics
LLFastTimer::EFastTimerType LLFastTimer::sCurType = LLFastTimer::FTM_OTHER;
int LLFastTimer::sCurDepth = 0;
U64 LLFastTimer::sStart[LLFastTimer::FTM_MAX_DEPTH];
U64 LLFastTimer::sCounter[LLFastTimer::FTM_NUM_TYPES];
U64 LLFastTimer::sCountHistory[LLFastTimer::FTM_HISTORY_NUM][LLFastTimer::FTM_NUM_TYPES];
U64 LLFastTimer::sCountAverage[LLFastTimer::FTM_NUM_TYPES];
U64 LLFastTimer::sCalls[LLFastTimer::FTM_NUM_TYPES];
U64 LLFastTimer::sCallHistory[LLFastTimer::FTM_HISTORY_NUM][LLFastTimer::FTM_NUM_TYPES];
U64 LLFastTimer::sCallAverage[LLFastTimer::FTM_NUM_TYPES];
S32 LLFastTimer::sCurFrameIndex = -1;
S32 LLFastTimer::sLastFrameIndex = -1;
int LLFastTimer::sPauseHistory = 0;
int LLFastTimer::sResetHistory = 0;
F64 LLFastTimer::sCPUClockFrequency = 0.0;
#if LL_LINUX || LL_SOLARIS
U64 LLFastTimer::sClockResolution = 1e9; // Nanosecond resolution
#else
U64 LLFastTimer::sClockResolution = 1e6; // Microsecond resolution
#endif
//////////////////////////////////////////////////////////////////////////////
//
// CPU clock/other clock frequency and count functions
//
#if LL_WINDOWS
U64 get_cpu_clock_count()
{ U32 hi,lo;
__asm
{
_emit 0x0f
_emit 0x31
mov lo,eax
mov hi,edx
}
U64 ret = hi;
ret *= 4294967296L;
ret |= lo;
return ret;
};
#endif // LL_WINDOWS
#if LL_LINUX || LL_SOLARIS
// Try to use the MONOTONIC clock if available, this is a constant time counter
// with nanosecond resolution (but not necessarily accuracy) and attempts are made
// to synchronize this value between cores at kernel start. It should not be effected
// by CPU frequency. If not available use the REALTIME clock, but this may be effected by
// NTP adjustments or other user activity effecting the system time.
U64 get_cpu_clock_count()
{
struct timespec tp;
#ifdef CLOCK_MONOTONIC
clock_gettime(CLOCK_MONOTONIC,&tp);
#else
clock_gettime(CLOCK_REALTIME,&tp);
#endif
return (tp.tv_sec*LLFastTimer::sClockResolution)+tp.tv_nsec;
}
#endif // (LL_LINUX || LL_SOLARIS))
#if LL_DARWIN
//
// Mac implementation of CPU clock
//
// Just use gettimeofday implementation for now
U64 get_cpu_clock_count()
{
return get_clock_count();
}
#endif
//////////////////////////////////////////////////////////////////////////////
//static
#if LL_DARWIN || LL_LINUX || LL_SOLARIS
// Both Linux and Mac use gettimeofday for accurate time
U64 LLFastTimer::countsPerSecond()
{
return sClockResolution; // microseconds, so 1 Mhz.
}
#else
U64 LLFastTimer::countsPerSecond()
{
if (!sCPUClockFrequency)
{
CProcessor proc;
sCPUClockFrequency = proc.GetCPUFrequency(50);
}
return U64(sCPUClockFrequency);
}
#endif
void LLFastTimer::reset()
{
countsPerSecond(); // good place to calculate clock frequency
if (sCurDepth != 0)
{
llerrs << "LLFastTimer::Reset() when sCurDepth != 0" << llendl;
}
if (sPauseHistory)
{
sResetHistory = 1;
}
else if (sResetHistory)
{
sCurFrameIndex = -1;
sResetHistory = 0;
}
else if (sCurFrameIndex >= 0)
{
int hidx = sCurFrameIndex % FTM_HISTORY_NUM;
for (S32 i=0; i<FTM_NUM_TYPES; i++)
{
sCountHistory[hidx][i] = sCounter[i];
sCountAverage[i] = (sCountAverage[i]*sCurFrameIndex + sCounter[i]) / (sCurFrameIndex+1);
sCallHistory[hidx][i] = sCalls[i];
sCallAverage[i] = (sCallAverage[i]*sCurFrameIndex + sCalls[i]) / (sCurFrameIndex+1);
}
sLastFrameIndex = sCurFrameIndex;
}
else
{
for (S32 i=0; i<FTM_NUM_TYPES; i++)
{
sCountAverage[i] = 0;
sCallAverage[i] = 0;
}
}
sCurFrameIndex++;
for (S32 i=0; i<FTM_NUM_TYPES; i++)
{
sCounter[i] = 0;
sCalls[i] = 0;
}
sCurDepth = 0;
}
//////////////////////////////////////////////////////////////////////////////
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