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Add an EXPLAIN (BUFFERS) option to show buffer-usage statistics.

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This patch also removes buffer-usage statistics from the track_counts
output, since this (or the global server statistics) is deemed to be a better
interface to this information.

Itagaki Takahiro, reviewed by Euler Taveira de Oliveira.
This commit is contained in:
Robert Haas
2009-12-15 04:57:48 +00:00
parent 6f1bf75d50
commit cddca5ec13
25 changed files with 274 additions and 140 deletions
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28
src/include/executor/instrument.h
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@@ -6,7 +6,7 @@
*
* Copyright (c) 2001-2009, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/executor/instrument.h,v 1.20 2009/01/01 17:23:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/executor/instrument.h,v 1.21 2009/12/15 04:57:48 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,22 +16,46 @@
#include "portability/instr_time.h"
typedef struct BufferUsage
{
long shared_blks_hit; /* # of shared buffer hits */
long shared_blks_read; /* # of shared disk blocks read */
long shared_blks_written; /* # of shared disk blocks written */
long local_blks_hit; /* # of local buffer hits */
long local_blks_read; /* # of local disk blocks read */
long local_blks_written; /* # of local disk blocks written */
long temp_blks_read; /* # of temp blocks read */
long temp_blks_written; /* # of temp blocks written */
} BufferUsage;
typedef enum InstrumentOption
{
INSTRUMENT_TIMER = 1 << 0, /* needs timer */
INSTRUMENT_BUFFERS = 1 << 1, /* needs buffer usage */
INSTRUMENT_ALL = 0x7FFFFFFF
} InstrumentOption;
typedef struct Instrumentation
{
/* Info about current plan cycle: */
bool running; /* TRUE if we've completed first tuple */
bool needs_bufusage; /* TRUE if we need buffer usage */
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 */
BufferUsage bufusage_start; /* Buffer usage at start */
/* 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 */
BufferUsage bufusage; /* Total buffer usage */
} Instrumentation;
extern Instrumentation *InstrAlloc(int n);
extern BufferUsage pgBufferUsage;
extern Instrumentation *InstrAlloc(int n, int instrument_options);
extern void InstrStartNode(Instrumentation *instr);
extern void InstrStopNode(Instrumentation *instr, double nTuples);
extern void InstrEndLoop(Instrumentation *instr);