Include information on buffer usage. Specifically, include the number of
shared blocks hit, read, dirtied, and written, the number of local blocks
hit, read, dirtied, and written, the number of temp blocks read and
- written, and the time spent reading and writing data file blocks
- (in milliseconds) if <xref linkend="guc-track-io-timing"/> is enabled.
- A <emphasis>hit</emphasis> means that a read was avoided because the block was
- found already in cache when needed.
+ written, and the time spent reading and writing data file blocks and
+ temporary file blocks (in milliseconds) if
+ <xref linkend="guc-track-io-timing"/> is enabled. A
+ <emphasis>hit</emphasis> means that a read was avoided because the block
+ was found already in cache when needed.
Shared blocks contain data from regular tables and indexes;
local blocks contain data from temporary tables and indexes;
- while temp blocks contain short-term working data used in sorts, hashes,
- Materialize plan nodes, and similar cases.
+ while temporary blocks contain short-term working data used in sorts,
+ hashes, Materialize plan nodes, and similar cases.
The number of blocks <emphasis>dirtied</emphasis> indicates the number of
previously unmodified blocks that were changed by this query; while the
number of blocks <emphasis>written</emphasis> indicates the number of
usage->temp_blks_written > 0);
bool has_timing = (!INSTR_TIME_IS_ZERO(usage->blk_read_time) ||
!INSTR_TIME_IS_ZERO(usage->blk_write_time));
+ bool has_temp_timing = (!INSTR_TIME_IS_ZERO(usage->temp_blk_read_time) ||
+ !INSTR_TIME_IS_ZERO(usage->temp_blk_write_time));
bool show_planning = (planning && (has_shared ||
- has_local || has_temp || has_timing));
+ has_local || has_temp || has_timing ||
+ has_temp_timing));
if (show_planning)
{
}
/* As above, show only positive counter values. */
- if (has_timing)
+ if (has_timing || has_temp_timing)
{
ExplainIndentText(es);
appendStringInfoString(es->str, "I/O Timings:");
- if (!INSTR_TIME_IS_ZERO(usage->blk_read_time))
- appendStringInfo(es->str, " read=%0.3f",
- INSTR_TIME_GET_MILLISEC(usage->blk_read_time));
- if (!INSTR_TIME_IS_ZERO(usage->blk_write_time))
- appendStringInfo(es->str, " write=%0.3f",
- INSTR_TIME_GET_MILLISEC(usage->blk_write_time));
+
+ if (has_timing)
+ {
+ appendStringInfoString(es->str, " shared/local");
+ if (!INSTR_TIME_IS_ZERO(usage->blk_read_time))
+ appendStringInfo(es->str, " read=%0.3f",
+ INSTR_TIME_GET_MILLISEC(usage->blk_read_time));
+ if (!INSTR_TIME_IS_ZERO(usage->blk_write_time))
+ appendStringInfo(es->str, " write=%0.3f",
+ INSTR_TIME_GET_MILLISEC(usage->blk_write_time));
+ if (has_temp_timing)
+ appendStringInfoChar(es->str, ',');
+ }
+ if (has_temp_timing)
+ {
+ appendStringInfoString(es->str, " temp");
+ if (!INSTR_TIME_IS_ZERO(usage->temp_blk_read_time))
+ appendStringInfo(es->str, " read=%0.3f",
+ INSTR_TIME_GET_MILLISEC(usage->temp_blk_read_time));
+ if (!INSTR_TIME_IS_ZERO(usage->temp_blk_write_time))
+ appendStringInfo(es->str, " write=%0.3f",
+ INSTR_TIME_GET_MILLISEC(usage->temp_blk_write_time));
+ }
appendStringInfoChar(es->str, '\n');
}
ExplainPropertyFloat("I/O Write Time", "ms",
INSTR_TIME_GET_MILLISEC(usage->blk_write_time),
3, es);
+ ExplainPropertyFloat("Temp I/O Read Time", "ms",
+ INSTR_TIME_GET_MILLISEC(usage->temp_blk_read_time),
+ 3, es);
+ ExplainPropertyFloat("Temp I/O Write Time", "ms",
+ INSTR_TIME_GET_MILLISEC(usage->temp_blk_write_time),
+ 3, es);
}
}
}
dst->temp_blks_written += add->temp_blks_written;
INSTR_TIME_ADD(dst->blk_read_time, add->blk_read_time);
INSTR_TIME_ADD(dst->blk_write_time, add->blk_write_time);
+ INSTR_TIME_ADD(dst->temp_blk_read_time, add->temp_blk_read_time);
+ INSTR_TIME_ADD(dst->temp_blk_write_time, add->temp_blk_write_time);
}
/* dst += add - sub */
add->blk_read_time, sub->blk_read_time);
INSTR_TIME_ACCUM_DIFF(dst->blk_write_time,
add->blk_write_time, sub->blk_write_time);
+ INSTR_TIME_ACCUM_DIFF(dst->temp_blk_read_time,
+ add->temp_blk_read_time, sub->temp_blk_read_time);
+ INSTR_TIME_ACCUM_DIFF(dst->temp_blk_write_time,
+ add->temp_blk_write_time, sub->temp_blk_write_time);
}
/* helper functions for WAL usage accumulation */
BufFileLoadBuffer(BufFile *file)
{
File thisfile;
+ instr_time io_start;
+ instr_time io_time;
/*
* Advance to next component file if necessary and possible.
file->curOffset = 0L;
}
+ thisfile = file->files[file->curFile];
+
+ if (track_io_timing)
+ INSTR_TIME_SET_CURRENT(io_start);
+
/*
* Read whatever we can get, up to a full bufferload.
*/
- thisfile = file->files[file->curFile];
file->nbytes = FileRead(thisfile,
file->buffer.data,
sizeof(file->buffer),
FilePathName(thisfile))));
}
+ if (track_io_timing)
+ {
+ INSTR_TIME_SET_CURRENT(io_time);
+ INSTR_TIME_SUBTRACT(io_time, io_start);
+ INSTR_TIME_ADD(pgBufferUsage.temp_blk_read_time, io_time);
+ }
+
/* we choose not to advance curOffset here */
if (file->nbytes > 0)
while (wpos < file->nbytes)
{
off_t availbytes;
+ instr_time io_start;
+ instr_time io_time;
/*
* Advance to next component file if necessary and possible.
bytestowrite = (int) availbytes;
thisfile = file->files[file->curFile];
+
+ if (track_io_timing)
+ INSTR_TIME_SET_CURRENT(io_start);
+
bytestowrite = FileWrite(thisfile,
file->buffer.data + wpos,
bytestowrite,
(errcode_for_file_access(),
errmsg("could not write to file \"%s\": %m",
FilePathName(thisfile))));
+
+ if (track_io_timing)
+ {
+ INSTR_TIME_SET_CURRENT(io_time);
+ INSTR_TIME_SUBTRACT(io_time, io_start);
+ INSTR_TIME_ADD(pgBufferUsage.temp_blk_write_time, io_time);
+ }
+
file->curOffset += bytestowrite;
wpos += bytestowrite;
int64 local_blks_written; /* # of local disk blocks written */
int64 temp_blks_read; /* # of temp blocks read */
int64 temp_blks_written; /* # of temp blocks written */
- instr_time blk_read_time; /* time spent reading */
- instr_time blk_write_time; /* time spent writing */
+ instr_time blk_read_time; /* time spent reading blocks */
+ instr_time blk_write_time; /* time spent writing blocks */
+ instr_time temp_blk_read_time; /* time spent reading temp blocks */
+ instr_time temp_blk_write_time; /* time spent writing temp blocks */
} BufferUsage;
/*
Execution Time: N.N ms
(3 rows)
-select explain_filter('explain (analyze, buffers, format json) select * from int8_tbl i8');
- explain_filter
-------------------------------------
- [ +
- { +
- "Plan": { +
- "Node Type": "Seq Scan", +
- "Parallel Aware": false, +
- "Async Capable": false, +
- "Relation Name": "int8_tbl",+
- "Alias": "i8", +
- "Startup Cost": N.N, +
- "Total Cost": N.N, +
- "Plan Rows": N, +
- "Plan Width": N, +
- "Actual Startup Time": N.N, +
- "Actual Total Time": N.N, +
- "Actual Rows": N, +
- "Actual Loops": 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 +
- }, +
- "Planning": { +
- "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 +
- }, +
- "Planning Time": N.N, +
- "Triggers": [ +
- ], +
- "Execution Time": N.N +
- } +
- ]
-(1 row)
-
select explain_filter('explain (analyze, buffers, format xml) select * from int8_tbl i8');
explain_filter
--------------------------------------------------------
]
(1 row)
+-- Check output including I/O timings. These fields are conditional
+-- but always set in JSON format, so check them only in this case.
+set track_io_timing = on;
+select explain_filter('explain (analyze, buffers, format json) select * from int8_tbl i8');
+ explain_filter
+------------------------------------
+ [ +
+ { +
+ "Plan": { +
+ "Node Type": "Seq Scan", +
+ "Parallel Aware": false, +
+ "Async Capable": false, +
+ "Relation Name": "int8_tbl",+
+ "Alias": "i8", +
+ "Startup Cost": N.N, +
+ "Total Cost": N.N, +
+ "Plan Rows": N, +
+ "Plan Width": N, +
+ "Actual Startup Time": N.N, +
+ "Actual Total Time": N.N, +
+ "Actual Rows": N, +
+ "Actual Loops": 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, +
+ "I/O Read Time": N.N, +
+ "I/O Write Time": N.N, +
+ "Temp I/O Read Time": N.N, +
+ "Temp I/O Write Time": N.N +
+ }, +
+ "Planning": { +
+ "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, +
+ "I/O Read Time": N.N, +
+ "I/O Write Time": N.N, +
+ "Temp I/O Read Time": N.N, +
+ "Temp I/O Write Time": N.N +
+ }, +
+ "Planning Time": N.N, +
+ "Triggers": [ +
+ ], +
+ "Execution Time": N.N +
+ } +
+ ]
+(1 row)
+
+set track_io_timing = off;
-- SETTINGS option
-- We have to ignore other settings that might be imposed by the environment,
-- so printing the whole Settings field unfortunately won't do.
select explain_filter('explain (analyze) select * from int8_tbl i8');
select explain_filter('explain (analyze, verbose) select * from int8_tbl i8');
select explain_filter('explain (analyze, buffers, format text) select * from int8_tbl i8');
-select explain_filter('explain (analyze, buffers, format json) select * from int8_tbl i8');
select explain_filter('explain (analyze, buffers, format xml) select * from int8_tbl i8');
select explain_filter('explain (analyze, buffers, format yaml) select * from int8_tbl i8');
select explain_filter('explain (buffers, format text) select * from int8_tbl i8');
select explain_filter('explain (buffers, format json) select * from int8_tbl i8');
+-- Check output including I/O timings. These fields are conditional
+-- but always set in JSON format, so check them only in this case.
+set track_io_timing = on;
+select explain_filter('explain (analyze, buffers, format json) select * from int8_tbl i8');
+set track_io_timing = off;
+
-- SETTINGS option
-- We have to ignore other settings that might be imposed by the environment,
-- so printing the whole Settings field unfortunately won't do.
projects / users / rhaas / postgres.git / commitdiff