223 lines
7.8 KiB
C
223 lines
7.8 KiB
C
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//------------------------------------------------------------------------------
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// File: Measure.h
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//
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// Desc: DirectShow base classes.
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//
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// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------------------------
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/*
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The idea is to pepper the source code with interesting measurements and
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have the last few thousand of these recorded in a circular buffer that
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can be post-processed to give interesting numbers.
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WHAT THE LOG LOOKS LIKE:
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Time (sec) Type Delta Incident_Name
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0.055,41 NOTE -. Incident Nine - Another note
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0.055,42 NOTE 0.000,01 Incident Nine - Another note
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0.055,44 NOTE 0.000,02 Incident Nine - Another note
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0.055,45 STOP -. Incident Eight - Also random
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0.055,47 START -. Incident Seven - Random
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0.055,49 NOTE 0.000,05 Incident Nine - Another note
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------- <etc. there is a lot of this> ----------------
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0.125,60 STOP 0.000,03 Msr_Stop
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0.125,62 START -. Msr_Start
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0.125,63 START -. Incident Two - Start/Stop
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0.125,65 STOP 0.000,03 Msr_Start
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0.125,66 START -. Msr_Stop
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0.125,68 STOP 0.000,05 Incident Two - Start/Stop
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0.125,70 STOP 0.000,04 Msr_Stop
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0.125,72 START -. Msr_Start
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0.125,73 START -. Incident Two - Start/Stop
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0.125,75 STOP 0.000,03 Msr_Start
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0.125,77 START -. Msr_Stop
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0.125,78 STOP 0.000,05 Incident Two - Start/Stop
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0.125,80 STOP 0.000,03 Msr_Stop
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0.125,81 NOTE -. Incident Three - single Note
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0.125,83 START -. Incident Four - Start, no stop
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0.125,85 START -. Incident Five - Single Start/Stop
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0.125,87 STOP 0.000,02 Incident Five - Single Start/Stop
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Number Average StdDev Smallest Largest Incident_Name
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10 0.000,58 0.000,10 0.000,55 0.000,85 Incident One - Note
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50 0.000,05 0.000,00 0.000,05 0.000,05 Incident Two - Start/Stop
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1 -. -. -. -. Incident Three - single Note
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0 -. -. -. -. Incident Four - Start, no stop
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1 0.000,02 -. 0.000,02 0.000,02 Incident Five - Single Start/Stop
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0 -. -. -. -. Incident Six - zero occurrences
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100 0.000,25 0.000,12 0.000,02 0.000,62 Incident Seven - Random
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100 0.000,79 0.000,48 0.000,02 0.001,92 Incident Eight - Also random
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5895 0.000,01 0.000,01 0.000,01 0.000,56 Incident Nine - Another note
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10 0.000,03 0.000,00 0.000,03 0.000,04 Msr_Note
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50 0.000,03 0.000,00 0.000,03 0.000,04 Msr_Start
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50 0.000,04 0.000,03 0.000,03 0.000,31 Msr_Stop
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WHAT IT MEANS:
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The log shows what happened and when. Each line shows the time at which
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something happened (see WHAT YOU CODE below) what it was that happened
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and (if approporate) the time since the corresponding previous event
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(that's the delta column).
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The statistics show how many times each event occurred, what the average
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delta time was, also the standard deviation, largest and smalles delta.
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WHAT YOU CODE:
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Before anything else executes: - register your ids
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int id1 = Msr_Register("Incident One - Note");
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int id2 = Msr_Register("Incident Two - Start/Stop");
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int id3 = Msr_Register("Incident Three - single Note");
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etc.
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At interesting moments:
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// To measure a repetitive event - e.g. end of bitblt to screen
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Msr_Note(Id9); // e.g. "video frame hiting the screen NOW!"
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or
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// To measure an elapsed time e.g. time taken to decode an MPEG B-frame
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Msr_Start(Id2); // e.g. "Starting to decode MPEG B-frame"
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. . .
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MsrStop(Id2); // "Finished MPEG decode"
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At the end:
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HANDLE hFile;
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hFile = CreateFile("Perf.log", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL);
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Msr_Dump(hFile); // This writes the log out to the file
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CloseHandle(hFile);
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or
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Msr_Dump(NULL); // This writes it to DbgLog((LOG_TRACE,0, ... ));
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// but if you are writing it out to the debugger
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// then the times are probably all garbage because
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// the debugger can make things run awfully slow.
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A given id should be used either for start / stop or Note calls. If Notes
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are mixed in with Starts and Stops their statistics will be gibberish.
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If you code the calls in upper case i.e. MSR_START(idMunge); then you get
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macros which will turn into nothing unless PERF is defined.
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You can reset the statistical counts for a given id by calling Reset(Id).
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They are reset by default at the start.
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It logs Reset as a special incident, so you can see it in the log.
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The log is a circular buffer in storage (to try to minimise disk I/O).
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It overwrites the oldest entries once full. The statistics include ALL
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incidents since the last Reset, whether still visible in the log or not.
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*/
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#ifndef __MEASURE__
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#define __MEASURE__
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#ifdef PERF
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#define MSR_INIT() Msr_Init()
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#define MSR_TERMINATE() Msr_Terminate()
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#define MSR_REGISTER(a) Msr_Register(a)
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#define MSR_RESET(a) Msr_Reset(a)
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#define MSR_CONTROL(a) Msr_Control(a)
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#define MSR_START(a) Msr_Start(a)
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#define MSR_STOP(a) Msr_Stop(a)
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#define MSR_NOTE(a) Msr_Note(a)
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#define MSR_INTEGER(a,b) Msr_Integer(a,b)
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#define MSR_DUMP(a) Msr_Dump(a)
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#define MSR_DUMPSTATS(a) Msr_DumpStats(a)
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#else
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#define MSR_INIT() ((void)0)
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#define MSR_TERMINATE() ((void)0)
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#define MSR_REGISTER(a) 0
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#define MSR_RESET(a) ((void)0)
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#define MSR_CONTROL(a) ((void)0)
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#define MSR_START(a) ((void)0)
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#define MSR_STOP(a) ((void)0)
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#define MSR_NOTE(a) ((void)0)
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#define MSR_INTEGER(a,b) ((void)0)
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#define MSR_DUMP(a) ((void)0)
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#define MSR_DUMPSTATS(a) ((void)0)
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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// This must be called first - (called by the DllEntry)
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void WINAPI Msr_Init(void);
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// Call this last to clean up (or just let it fall off the end - who cares?)
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void WINAPI Msr_Terminate(void);
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// Call this to get an Id for an "incident" that you can pass to Start, Stop or Note
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// everything that's logged is called an "incident".
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int WINAPI Msr_Register(LPTSTR Incident);
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// Reset the statistical counts for an incident
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void WINAPI Msr_Reset(int Id);
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// Reset all the counts for all incidents
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#define MSR_RESET_ALL 0
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#define MSR_PAUSE 1
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#define MSR_RUN 2
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void WINAPI Msr_Control(int iAction);
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// log the start of an operation
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void WINAPI Msr_Start(int Id);
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// log the end of an operation
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void WINAPI Msr_Stop(int Id);
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// log a one-off or repetitive operation
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void WINAPI Msr_Note(int Id);
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// log an integer (on which we can see statistics later)
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void WINAPI Msr_Integer(int Id, int n);
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// print out all the vaialable log (it may have wrapped) and then the statistics.
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// When the log wraps you lose log but the statistics are still complete.
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// hFIle==NULL => use DbgLog
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// otherwise hFile must have come from CreateFile or OpenFile.
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void WINAPI Msr_Dump(HANDLE hFile);
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// just dump the statistics - never mind the log
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void WINAPI Msr_DumpStats(HANDLE hFile);
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// Type definitions in case you want to declare a pointer to the dump functions
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// (makes it a trifle easier to do dynamic linking
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// i.e. LoadModule, GetProcAddress and call that)
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// Typedefs so can declare MSR_DUMPPROC *MsrDumpStats; or whatever
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typedef void WINAPI MSR_DUMPPROC(HANDLE hFile);
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typedef void WINAPI MSR_CONTROLPROC(int iAction);
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#ifdef __cplusplus
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}
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#endif
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#endif // __MEASURE__
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