mirror of https://github.com/postgres/postgres
counts alongside the planner's estimates. By Martijn van Oosterhout, with some further work by Tom Lane.REL7_2_STABLE
Tom Lane
25 years ago
parent
27d2890b87
commit
89fa551808
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/*-------------------------------------------------------------------------
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* |
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* instrument.c |
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* functions for instrumentation of plan execution
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* |
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* |
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* Copyright (c) 2001, PostgreSQL Global Development Group |
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* |
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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/executor/instrument.c,v 1.1 2001/09/18 01:59:06 tgl Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#include "postgres.h" |
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#include <unistd.h> |
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#include "executor/instrument.h" |
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/* Allocate new instrumentation structure */ |
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Instrumentation * |
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InstrAlloc(void) |
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{ |
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Instrumentation *instr = palloc( sizeof(Instrumentation) ); |
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memset( instr, 0, sizeof(Instrumentation) ); |
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return instr; |
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} |
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/* Entry to a plan node */ |
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void |
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InstrStartNode(Instrumentation *instr) |
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{ |
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if (!instr) |
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return; |
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if (instr->starttime.tv_sec != 0 || instr->starttime.tv_usec != 0) |
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elog(DEBUG, "InstrStartTimer called twice in a row"); |
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else |
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gettimeofday(&instr->starttime, NULL); |
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} |
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/* Exit from a plan node */ |
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void |
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InstrStopNode(Instrumentation *instr, bool returnedTuple) |
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{ |
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struct timeval endtime; |
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if (!instr) |
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return; |
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if (instr->starttime.tv_sec == 0 && instr->starttime.tv_usec == 0) |
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{ |
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elog(DEBUG, "InstrStopNode without start"); |
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return; |
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} |
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gettimeofday(&endtime, NULL); |
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instr->counter.tv_sec += endtime.tv_sec - instr->starttime.tv_sec; |
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instr->counter.tv_usec += endtime.tv_usec - instr->starttime.tv_usec; |
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/* Normalize after each add to avoid overflow/underflow of tv_usec */ |
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while (instr->counter.tv_usec < 0) |
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{ |
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instr->counter.tv_usec += 1000000; |
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instr->counter.tv_sec--; |
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} |
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while (instr->counter.tv_usec >= 1000000) |
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{ |
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instr->counter.tv_usec -= 1000000; |
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instr->counter.tv_sec++; |
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} |
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instr->starttime.tv_sec = 0; |
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instr->starttime.tv_usec = 0; |
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/* Is this the first tuple of this cycle? */ |
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if (!instr->running) |
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{ |
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instr->running = true; |
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instr->firsttuple = (double) instr->counter.tv_sec + |
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(double) instr->counter.tv_usec / 1000000.0; |
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} |
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if (returnedTuple) |
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instr->tuplecount += 1; |
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} |
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/* Finish a run cycle for a plan node */ |
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void
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InstrEndLoop(Instrumentation *instr) |
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{ |
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double totaltime; |
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if (!instr) |
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return; |
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/* Skip if nothing has happened, or already shut down */ |
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if (!instr->running) |
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return; |
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/* Accumulate statistics */ |
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totaltime = (double) instr->counter.tv_sec + |
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(double) instr->counter.tv_usec / 1000000.0;
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instr->startup += instr->firsttuple; |
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instr->total += totaltime; |
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instr->ntuples += instr->tuplecount; |
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instr->nloops += 1; |
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/* Reset for next cycle (if any) */ |
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instr->running = false; |
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instr->starttime.tv_sec = 0; |
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instr->starttime.tv_usec = 0; |
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instr->counter.tv_sec = 0; |
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instr->counter.tv_usec = 0; |
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instr->firsttuple = 0; |
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instr->tuplecount = 0; |
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} |
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@ -0,0 +1,39 @@ |
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/*-------------------------------------------------------------------------
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* |
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* instrument.h |
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* definitions for run-time statistics collection |
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* |
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* |
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* Copyright (c) 2001, PostgreSQL Global Development Group |
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* |
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* $Id: instrument.h,v 1.1 2001/09/18 01:59:06 tgl Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef INSTRUMENT_H |
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#define INSTRUMENT_H |
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#include <sys/time.h> |
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typedef struct Instrumentation |
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{ |
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/* Info about current plan cycle: */ |
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bool running; /* TRUE if we've completed first tuple */ |
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struct timeval starttime; /* Start time of current iteration of node */ |
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struct timeval counter; /* Accumulates runtime for this node */ |
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double firsttuple; /* Time for first tuple of this cycle */ |
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double tuplecount; /* Tuples so far this cycle */ |
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/* Accumulated statistics across all completed cycles: */ |
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double startup; /* Total startup time (in seconds) */ |
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double total; /* Total total time (in seconds) */ |
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double ntuples; /* Total tuples produced */ |
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double nloops; /* # of run cycles for this node */ |
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} Instrumentation; |
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extern Instrumentation *InstrAlloc(void); |
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extern void InstrStartNode(Instrumentation *instr); |
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extern void InstrStopNode(Instrumentation *instr, bool returnedTuple); |
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extern void InstrEndLoop(Instrumentation *instr); |
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#endif /* INSTRUMENT_H */ |
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