137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/*-------------------------------------------------------------------------
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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) 2001-2010, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/executor/instrument.c,v 1.25 2010/02/26 02:00:41 momjian 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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BufferUsage pgBufferUsage;
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static void BufferUsageAccumDiff(BufferUsage *dst,
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const BufferUsage *add, const BufferUsage *sub);
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/* Allocate new instrumentation structure(s) */
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Instrumentation *
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InstrAlloc(int n, int instrument_options)
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{
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Instrumentation *instr;
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/* timer is always required for now */
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Assert(instrument_options & INSTRUMENT_TIMER);
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instr = palloc0(n * sizeof(Instrumentation));
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if (instrument_options & INSTRUMENT_BUFFERS)
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{
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int i;
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for (i = 0; i < n; i++)
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instr[i].needs_bufusage = true;
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}
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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_TIME_IS_ZERO(instr->starttime))
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INSTR_TIME_SET_CURRENT(instr->starttime);
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else
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elog(DEBUG2, "InstrStartNode called twice in a row");
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/* initialize buffer usage per plan node */
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if (instr->needs_bufusage)
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instr->bufusage_start = pgBufferUsage;
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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, double nTuples)
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{
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instr_time endtime;
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/* count the returned tuples */
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instr->tuplecount += nTuples;
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if (INSTR_TIME_IS_ZERO(instr->starttime))
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{
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elog(DEBUG2, "InstrStopNode called without start");
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return;
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}
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INSTR_TIME_SET_CURRENT(endtime);
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INSTR_TIME_ACCUM_DIFF(instr->counter, endtime, instr->starttime);
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INSTR_TIME_SET_ZERO(instr->starttime);
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/* Adds delta of buffer usage to node's count. */
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if (instr->needs_bufusage)
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BufferUsageAccumDiff(&instr->bufusage,
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&pgBufferUsage, &instr->bufusage_start);
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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 = INSTR_TIME_GET_DOUBLE(instr->counter);
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}
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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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/* 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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if (!INSTR_TIME_IS_ZERO(instr->starttime))
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elog(DEBUG2, "InstrEndLoop called on running node");
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/* Accumulate per-cycle statistics into totals */
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totaltime = INSTR_TIME_GET_DOUBLE(instr->counter);
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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_TIME_SET_ZERO(instr->starttime);
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INSTR_TIME_SET_ZERO(instr->counter);
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instr->firsttuple = 0;
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instr->tuplecount = 0;
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}
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static void
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BufferUsageAccumDiff(BufferUsage *dst,
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const BufferUsage *add,
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const BufferUsage *sub)
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{
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/* dst += add - sub */
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dst->shared_blks_hit += add->shared_blks_hit - sub->shared_blks_hit;
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dst->shared_blks_read += add->shared_blks_read - sub->shared_blks_read;
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dst->shared_blks_written += add->shared_blks_written - sub->shared_blks_written;
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dst->local_blks_hit += add->local_blks_hit - sub->local_blks_hit;
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dst->local_blks_read += add->local_blks_read - sub->local_blks_read;
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dst->local_blks_written += add->local_blks_written - sub->local_blks_written;
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dst->temp_blks_read += add->temp_blks_read - sub->temp_blks_read;
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dst->temp_blks_written += add->temp_blks_written - sub->temp_blks_written;
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}
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