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/*-------------------------------------------------------------------------
*
* instrument.h
* definitions for run-time statistics collection
*
*
* Copyright (c) 2001-2008, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/executor/instrument.h,v 1.18 2008/01/01 19:45:57 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef INSTRUMENT_H
#define INSTRUMENT_H
#include <sys/time.h>
/*
* gettimeofday() does not have sufficient resolution on Windows,
* so we must use QueryPerformanceCounter() instead. These macros
* also give some breathing room to use other high-precision-timing APIs
* on yet other platforms. (The macro-ization is not complete, however;
* see subtraction code in instrument.c and explain.c.)
*/
#ifndef WIN32
typedef struct timeval instr_time;
#define INSTR_TIME_IS_ZERO(t) ((t).tv_sec == 0 && (t).tv_usec == 0)
#define INSTR_TIME_SET_ZERO(t) ((t).tv_sec = 0, (t).tv_usec = 0)
#define INSTR_TIME_SET_CURRENT(t) gettimeofday(&(t), NULL)
#define INSTR_TIME_GET_DOUBLE(t) \
(((double) (t).tv_sec) + ((double) (t).tv_usec) / 1000000.0)
#else /* WIN32 */
typedef LARGE_INTEGER instr_time;
#define INSTR_TIME_IS_ZERO(t) ((t).QuadPart == 0)
#define INSTR_TIME_SET_ZERO(t) ((t).QuadPart = 0)
#define INSTR_TIME_SET_CURRENT(t) QueryPerformanceCounter(&(t))
#define INSTR_TIME_GET_DOUBLE(t) \
(((double) (t).QuadPart) / GetTimerFrequency())
static __inline__ double
GetTimerFrequency(void)
{
LARGE_INTEGER f;
QueryPerformanceFrequency(&f);
return (double) f.QuadPart;
}
#endif /* WIN32 */
typedef struct Instrumentation
{
/* Info about current plan cycle: */
bool running; /* TRUE if we've completed first tuple */
instr_time starttime; /* Start time of current iteration of node */
instr_time counter; /* Accumulated runtime for this node */
double firsttuple; /* Time for first tuple of this cycle */
double tuplecount; /* Tuples emitted so far this cycle */
/* Accumulated statistics across all completed cycles: */
double startup; /* Total startup time (in seconds) */
double total; /* Total total time (in seconds) */
double ntuples; /* Total tuples produced */
double nloops; /* # of run cycles for this node */
} Instrumentation;
extern Instrumentation *InstrAlloc(int n);
extern void InstrStartNode(Instrumentation *instr);
extern void InstrStopNode(Instrumentation *instr, double nTuples);
extern void InstrEndLoop(Instrumentation *instr);
#endif /* INSTRUMENT_H */
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