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Make EXPLAIN sampling smarter, to avoid excessive sampling delay.

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Martijn van Oosterhout
This commit is contained in:
Bruce Momjian
2006-05-30 14:01:58 +00:00
parent 53d669e5c6
commit 87bd07d979
8 changed files with 149 additions and 54 deletions
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10
src/include/executor/instrument.h
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@@ -6,7 +6,7 @@
*
* Copyright (c) 2001-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/executor/instrument.h,v 1.13 2006/03/05 15:58:56 momjian Exp $
* $PostgreSQL: pgsql/src/include/executor/instrument.h,v 1.14 2006/05/30 14:01:58 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -61,17 +61,21 @@ typedef struct Instrumentation
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 */
double samplecount; /* Samples collected this cycle */
/* 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 */
double nsamples; /* # of samples taken */
/* Tracking for sampling */
bool sampling; /* Are we sampling this iteration */
double nextsample; /* The next tuplecount we're going to sample */
} Instrumentation;
extern Instrumentation *InstrAlloc(int n);
extern void InstrStartNode(Instrumentation *instr);
extern void InstrStopNode(Instrumentation *instr, bool returnedTuple);
extern void InstrStopNodeMulti(Instrumentation *instr, double nTuples);
extern void InstrStopNode(Instrumentation *instr, double nTuples);
extern void InstrEndLoop(Instrumentation *instr);
#endif /* INSTRUMENT_H */