318 lines
8.4 KiB
C++
318 lines
8.4 KiB
C++
/**
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* @file llfasttimer.h
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* @brief Declaration of a fast timer.
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*
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* $LicenseInfo:firstyear=2004&license=viewergpl$
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*
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* Copyright (c) 2004-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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#ifndef LL_FASTTIMER_H
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#define LL_FASTTIMER_H
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#include "llinstancetracker.h"
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#define FAST_TIMER_ON 1
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#if LL_WINDOWS
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// shift off lower 8 bits for lower resolution but longer term timing
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// on 1Ghz machine, a 32-bit word will hold ~1000 seconds of timing
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inline U32 get_cpu_clock_count_32()
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{
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U32 ret_val;
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__asm
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{
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_emit 0x0f
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_emit 0x31
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shr eax,8
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shl edx,24
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or eax, edx
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mov dword ptr [ret_val], eax
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}
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return ret_val;
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}
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// return full timer value, still shifted by 8 bits
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inline U64 get_cpu_clock_count_64()
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{
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U64 ret_val;
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__asm
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{
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_emit 0x0f
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_emit 0x31
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mov eax,eax
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mov edx,edx
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mov dword ptr [ret_val+4], edx
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mov dword ptr [ret_val], eax
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}
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return ret_val >> 8;
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}
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#endif // LL_WINDOWS
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#if (LL_LINUX || LL_SOLARIS || LL_DARWIN) && (defined(__i386__) || defined(__amd64__))
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inline U32 get_cpu_clock_count_32()
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{
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U64 x;
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__asm__ volatile (".byte 0x0f, 0x31": "=A"(x));
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return (U32)x >> 8;
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}
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inline U32 get_cpu_clock_count_64()
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{
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U64 x;
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__asm__ volatile (".byte 0x0f, 0x31": "=A"(x));
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return x >> 8;
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}
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#endif
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#if ( LL_DARWIN && !(defined(__i386__) || defined(__amd64__))) || (LL_SOLARIS && defined(__sparc__))
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//
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// Mac PPC (deprecated) & Solaris SPARC implementation of CPU clock
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//
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// Just use gettimeofday implementation for now
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inline U32 get_cpu_clock_count_32()
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{
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return (U32)get_clock_count();
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}
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inline U32 get_cpu_clock_count_64()
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{
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return get_clock_count();
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}
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#endif
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class LLMutex;
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#include <queue>
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#include "llsd.h"
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class LL_COMMON_API LLFastTimer
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{
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public:
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// stores a "named" timer instance to be reused via multiple LLFastTimer stack instances
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class LL_COMMON_API NamedTimer
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: public LLInstanceTracker<NamedTimer>
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{
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friend class DeclareTimer;
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public:
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~NamedTimer();
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enum { HISTORY_NUM = 60 };
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const std::string& getName() const { return mName; }
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NamedTimer* getParent() const { return mParent; }
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void setParent(NamedTimer* parent);
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S32 getDepth();
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std::string getToolTip(S32 history_index = -1);
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typedef std::vector<NamedTimer*>::const_iterator child_const_iter;
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child_const_iter beginChildren();
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child_const_iter endChildren();
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std::vector<NamedTimer*>& getChildren();
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void setCollapsed(bool collapsed) { mCollapsed = collapsed; }
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bool getCollapsed() const { return mCollapsed; }
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U32 getCountAverage() const { return mCountAverage; }
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U32 getCallAverage() const { return mCallAverage; }
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U32 getHistoricalCount(S32 history_index = 0) const;
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U32 getHistoricalCalls(S32 history_index = 0) const;
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static NamedTimer& getRootNamedTimer();
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struct FrameState
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{
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FrameState(NamedTimer* timerp);
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U32 mSelfTimeCounter;
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U32 mCalls;
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FrameState* mParent; // info for caller timer
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FrameState* mLastCaller; // used to bootstrap tree construction
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NamedTimer* mTimer;
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U16 mActiveCount; // number of timers with this ID active on stack
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bool mMoveUpTree; // needs to be moved up the tree of timers at the end of frame
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};
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S32 getFrameStateIndex() const { return mFrameStateIndex; }
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FrameState& getFrameState() const;
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private:
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friend class LLFastTimer;
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friend class NamedTimerFactory;
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//
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// methods
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//
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NamedTimer(const std::string& name);
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// recursive call to gather total time from children
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static void accumulateTimings();
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// updates cumulative times and hierarchy,
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// can be called multiple times in a frame, at any point
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static void processTimes();
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static void buildHierarchy();
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static void resetFrame();
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static void reset();
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//
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// members
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//
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S32 mFrameStateIndex;
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std::string mName;
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U32 mTotalTimeCounter;
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U32 mCountAverage;
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U32 mCallAverage;
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U32* mCountHistory;
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U32* mCallHistory;
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// tree structure
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NamedTimer* mParent; // NamedTimer of caller(parent)
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std::vector<NamedTimer*> mChildren;
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bool mCollapsed; // don't show children
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bool mNeedsSorting; // sort children whenever child added
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};
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// used to statically declare a new named timer
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class LL_COMMON_API DeclareTimer
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: public LLInstanceTracker<DeclareTimer>
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{
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public:
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DeclareTimer(const std::string& name, bool open);
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DeclareTimer(const std::string& name);
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static void updateCachedPointers();
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// convertable to NamedTimer::FrameState for convenient usage of LLFastTimer(declared_timer)
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operator NamedTimer::FrameState&() { return *mFrameState; }
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private:
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NamedTimer& mTimer;
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NamedTimer::FrameState* mFrameState;
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};
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public:
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static LLMutex* sLogLock;
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static std::queue<LLSD> sLogQueue;
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static BOOL sLog;
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static BOOL sMetricLog;
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typedef std::vector<NamedTimer::FrameState> info_list_t;
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static info_list_t& getFrameStateList();
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enum RootTimerMarker { ROOT };
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LLFastTimer(RootTimerMarker);
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LLFastTimer(NamedTimer::FrameState& timer)
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: mFrameState(&timer)
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{
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#if FAST_TIMER_ON
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NamedTimer::FrameState* frame_state = &timer;
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U32 cur_time = get_cpu_clock_count_32();
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mStartSelfTime = cur_time;
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mStartTotalTime = cur_time;
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frame_state->mActiveCount++;
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frame_state->mCalls++;
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// keep current parent as long as it is active when we are
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frame_state->mMoveUpTree |= (frame_state->mParent->mActiveCount == 0);
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mLastTimer = sCurTimer;
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sCurTimer = this;
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#endif
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}
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~LLFastTimer()
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{
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#if FAST_TIMER_ON
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NamedTimer::FrameState* frame_state = mFrameState;
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U32 cur_time = get_cpu_clock_count_32();
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frame_state->mSelfTimeCounter += cur_time - mStartSelfTime;
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frame_state->mActiveCount--;
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LLFastTimer* last_timer = mLastTimer;
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sCurTimer = last_timer;
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// store last caller to bootstrap tree creation
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frame_state->mLastCaller = last_timer->mFrameState;
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// we are only tracking self time, so subtract our total time delta from parents
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U32 total_time = cur_time - mStartTotalTime;
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last_timer->mStartSelfTime += total_time;
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#endif
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}
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// call this once a frame to reset timers
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static void nextFrame();
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// dumps current cumulative frame stats to log
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// call nextFrame() to reset timers
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static void dumpCurTimes();
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// call this to reset timer hierarchy, averages, etc.
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static void reset();
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static U64 countsPerSecond();
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static S32 getLastFrameIndex() { return sLastFrameIndex; }
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static S32 getCurFrameIndex() { return sCurFrameIndex; }
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static void writeLog(std::ostream& os);
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static const NamedTimer* getTimerByName(const std::string& name);
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public:
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static bool sPauseHistory;
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static bool sResetHistory;
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private:
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typedef std::vector<LLFastTimer*> timer_stack_t;
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static LLFastTimer* sCurTimer;
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static S32 sCurFrameIndex;
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static S32 sLastFrameIndex;
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static U64 sLastFrameTime;
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static info_list_t* sTimerInfos;
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U32 mStartSelfTime; // start time + time of all child timers
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U32 mStartTotalTime; // start time + time of all child timers
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NamedTimer::FrameState* mFrameState;
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LLFastTimer* mLastTimer;
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};
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#endif // LL_LLFASTTIMER_H
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