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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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24
contrib/auto_explain/auto_explain.c
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@ -6,7 +6,7 @@
* Copyright (c) 2008-2009, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/contrib/auto_explain/auto_explain.c,v 1.9 2009/12/12 00:35:33 rhaas Exp $
* $PostgreSQL: pgsql/contrib/auto_explain/auto_explain.c,v 1.10 2009/12/15 04:57:46 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@ -22,6 +22,7 @@ PG_MODULE_MAGIC;
static int auto_explain_log_min_duration = -1; /* msec or -1 */
static bool auto_explain_log_analyze = false;
static bool auto_explain_log_verbose = false;
static bool auto_explain_log_buffers = false;
static int auto_explain_log_format = EXPLAIN_FORMAT_TEXT;
static bool auto_explain_log_nested_statements = false;
@ -93,6 +94,16 @@ _PG_init(void)
NULL,
NULL);
DefineCustomBoolVariable("auto_explain.log_buffers",
"Log buffers usage.",
NULL,
&auto_explain_log_buffers,
false,
PGC_SUSET,
0,
NULL,
NULL);
DefineCustomEnumVariable("auto_explain.log_format",
"EXPLAIN format to be used for plan logging.",
NULL,
@ -147,7 +158,11 @@ explain_ExecutorStart(QueryDesc *queryDesc, int eflags)
{
/* Enable per-node instrumentation iff log_analyze is required. */
if (auto_explain_log_analyze && (eflags & EXEC_FLAG_EXPLAIN_ONLY) == 0)
queryDesc->doInstrument = true;
{
queryDesc->instrument_options |= INSTRUMENT_TIMER;
if (auto_explain_log_buffers)
queryDesc->instrument_options |= INSTRUMENT_BUFFERS;
}
}
if (prev_ExecutorStart)
@ -167,7 +182,7 @@ explain_ExecutorStart(QueryDesc *queryDesc, int eflags)
MemoryContext oldcxt;
oldcxt = MemoryContextSwitchTo(queryDesc->estate->es_query_cxt);
queryDesc->totaltime = InstrAlloc(1);
queryDesc->totaltime = InstrAlloc(1, INSTRUMENT_ALL);
MemoryContextSwitchTo(oldcxt);
}
}
@ -219,8 +234,9 @@ explain_ExecutorEnd(QueryDesc *queryDesc)
ExplainState es;
ExplainInitState(&es);
es.analyze = (queryDesc->doInstrument && auto_explain_log_analyze);
es.analyze = (queryDesc->instrument_options && auto_explain_log_analyze);
es.verbose = auto_explain_log_verbose;
es.buffers = (es.analyze && auto_explain_log_buffers);
es.format = auto_explain_log_format;
ExplainBeginOutput(&es);