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Include information on buffer usage during planning phase, in EXPLAIN output, take two.

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When BUFFERS option is enabled, EXPLAIN command includes the information
on buffer usage during each plan node, in its output. In addition to that,
this commit makes EXPLAIN command include also the information on
buffer usage during planning phase, in its output. This feature makes it
easier to discern the cases where lots of buffer access happen during
planning.

This commit revives the original commit ed7a509571 that was reverted by
commit 19db23bcbd. The original commit had to be reverted because
it caused the regression test failure on the buildfarm members prion and
dory. But since commit c0885c4c30 got rid of the caues of the test failure,
the original commit can be safely introduced again.

Author: Julien Rouhaud, slightly revised by Fujii Masao
Reviewed-by: Justin Pryzby
Discussion: https://postgr.es/m/16109-26a1a88651e90608@postgresql.org
This commit is contained in:
Fujii Masao 2020-04-04 03:13:17 +09:00
parent e41955faf0
commit ce77abe63c
4 changed files with 95 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/backend/commands/explain.c
View File

@ -372,7 +372,11 @@ ExplainOneQuery(Query *query, int cursorOptions,
PlannedStmt *plan;
instr_time planstart,
planduration;
BufferUsage bufusage_start,
bufusage;
if (es->buffers)
bufusage_start = pgBufferUsage;
INSTR_TIME_SET_CURRENT(planstart);
/* plan the query */
@ -381,9 +385,16 @@ ExplainOneQuery(Query *query, int cursorOptions,
INSTR_TIME_SET_CURRENT(planduration);
INSTR_TIME_SUBTRACT(planduration, planstart);
/* calc differences of buffer counters. */
if (es->buffers)
{
memset(&bufusage, 0, sizeof(BufferUsage));
BufferUsageAccumDiff(&bufusage, &pgBufferUsage, &bufusage_start);
}
/* run it (if needed) and produce output */
ExplainOnePlan(plan, into, es, queryString, params, queryEnv,
&planduration);
&planduration, (es->buffers ? &bufusage : NULL));
}
}
@ -476,7 +487,8 @@ ExplainOneUtility(Node *utilityStmt, IntoClause *into, ExplainState *es,
void
ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into, ExplainState *es,
const char *queryString, ParamListInfo params,
QueryEnvironment *queryEnv, const instr_time *planduration)
QueryEnvironment *queryEnv, const instr_time *planduration,
const BufferUsage *bufusage)
{
DestReceiver *dest;
QueryDesc *queryDesc;
@ -560,6 +572,9 @@ ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into, ExplainState *es,
/* Create textual dump of plan tree */
ExplainPrintPlan(es, queryDesc);
if (es->summary && (planduration || bufusage))
ExplainOpenGroup("Planning", "Planning", true, es);
if (es->summary && planduration)
{
double plantime = INSTR_TIME_GET_DOUBLE(*planduration);
@ -567,6 +582,19 @@ ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into, ExplainState *es,
ExplainPropertyFloat("Planning Time", "ms", 1000.0 * plantime, 3, es);
}
/* Show buffer usage */
if (es->summary && bufusage)
{
if (es->format == EXPLAIN_FORMAT_TEXT)
es->indent++;
show_buffer_usage(es, bufusage);
if (es->format == EXPLAIN_FORMAT_TEXT)
es->indent--;
}
if (es->summary && (planduration || bufusage))
ExplainCloseGroup("Planning", "Planning", true, es);
/* Print info about runtime of triggers */
if (es->analyze)
ExplainPrintTriggers(es, queryDesc);

13
src/backend/commands/prepare.c
View File

@ -616,7 +616,11 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, IntoClause *into, ExplainState *es,
EState *estate = NULL;
instr_time planstart;
instr_time planduration;
BufferUsage bufusage_start,
bufusage;
if (es->buffers)
bufusage_start = pgBufferUsage;
INSTR_TIME_SET_CURRENT(planstart);
/* Look it up in the hash table */
@ -654,6 +658,13 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, IntoClause *into, ExplainState *es,
INSTR_TIME_SET_CURRENT(planduration);
INSTR_TIME_SUBTRACT(planduration, planstart);
/* calc differences of buffer counters. */
if (es->buffers)
{
memset(&bufusage, 0, sizeof(BufferUsage));
BufferUsageAccumDiff(&bufusage, &pgBufferUsage, &bufusage_start);
}
plan_list = cplan->stmt_list;
/* Explain each query */
@ -663,7 +674,7 @@ ExplainExecuteQuery(ExecuteStmt *execstmt, IntoClause *into, ExplainState *es,
if (pstmt->commandType != CMD_UTILITY)
ExplainOnePlan(pstmt, into, es, query_string, paramLI, queryEnv,
&planduration);
&planduration, (es->buffers ? &bufusage : NULL));
else
ExplainOneUtility(pstmt->utilityStmt, into, es, query_string,
paramLI, queryEnv);

3
src/include/commands/explain.h
View File

@ -89,7 +89,8 @@ extern void ExplainOneUtility(Node *utilityStmt, IntoClause *into,
extern void ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into,
ExplainState *es, const char *queryString,
ParamListInfo params, QueryEnvironment *queryEnv,
const instr_time *planduration);
const instr_time *planduration,
const BufferUsage *bufusage);
extern void ExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc);
extern void ExplainPrintTriggers(ExplainState *es, QueryDesc *queryDesc);

55
src/test/regress/expected/explain.out
View File

@ -105,7 +105,19 @@ select explain_filter('explain (analyze, buffers, format json) select * from int
"Temp Read Blocks": N, +
"Temp Written Blocks": N +
}, +
"Planning Time": N.N, +
"Planning": { +
"Planning Time": N.N, +
"Shared Hit Blocks": N, +
"Shared Read Blocks": N, +
"Shared Dirtied Blocks": N, +
"Shared Written Blocks": N, +
"Local Hit Blocks": N, +
"Local Read Blocks": N, +
"Local Dirtied Blocks": N, +
"Local Written Blocks": N, +
"Temp Read Blocks": N, +
"Temp Written Blocks": N +
}, +
"Triggers": [ +
], +
"Execution Time": N.N +
@ -142,7 +154,19 @@ select explain_filter('explain (analyze, buffers, format xml) select * from int8
<Temp-Read-Blocks>N</Temp-Read-Blocks> +
<Temp-Written-Blocks>N</Temp-Written-Blocks> +
</Plan> +
<Planning-Time>N.N</Planning-Time> +
<Planning> +
<Planning-Time>N.N</Planning-Time> +
<Shared-Hit-Blocks>N</Shared-Hit-Blocks> +
<Shared-Read-Blocks>N</Shared-Read-Blocks> +
<Shared-Dirtied-Blocks>N</Shared-Dirtied-Blocks>+
<Shared-Written-Blocks>N</Shared-Written-Blocks>+
<Local-Hit-Blocks>N</Local-Hit-Blocks> +
<Local-Read-Blocks>N</Local-Read-Blocks> +
<Local-Dirtied-Blocks>N</Local-Dirtied-Blocks> +
<Local-Written-Blocks>N</Local-Written-Blocks> +
<Temp-Read-Blocks>N</Temp-Read-Blocks> +
<Temp-Written-Blocks>N</Temp-Written-Blocks> +
</Planning> +
<Triggers> +
</Triggers> +
<Execution-Time>N.N</Execution-Time> +
@ -176,7 +200,18 @@ select explain_filter('explain (analyze, buffers, format yaml) select * from int
Local Written Blocks: N +
Temp Read Blocks: N +
Temp Written Blocks: N +
Planning Time: N.N +
Planning: +
Planning Time: N.N +
Shared Hit Blocks: N +
Shared Read Blocks: N +
Shared Dirtied Blocks: N +
Shared Written Blocks: N +
Local Hit Blocks: N +
Local Read Blocks: N +
Local Dirtied Blocks: N +
Local Written Blocks: N +
Temp Read Blocks: N +
Temp Written Blocks: N +
Triggers: +
Execution Time: N.N
(1 row)
@ -366,9 +401,21 @@ select jsonb_pretty(
"Shared Dirtied Blocks": 0, +
"Shared Written Blocks": 0 +
}, +
"Planning": { +
"Planning Time": 0.0, +
"Local Hit Blocks": 0, +
"Temp Read Blocks": 0, +
"Local Read Blocks": 0, +
"Shared Hit Blocks": 0, +
"Shared Read Blocks": 0, +
"Temp Written Blocks": 0, +
"Local Dirtied Blocks": 0, +
"Local Written Blocks": 0, +
"Shared Dirtied Blocks": 0, +
"Shared Written Blocks": 0 +
}, +
"Triggers": [ +
], +
"Planning Time": 0.0, +
"Execution Time": 0.0 +
} +
]