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Tweak trace_sort code to show the merge order (number of active input 

tapes) for each merge step.  This will give us some idea of how effective
the merge distribution algorithm is.
This commit is contained in:
Tom Lane 2006-03-08 16:59:03 +00:00
parent d233ec299c
commit c8cd76de28
1 changed files with 13 additions and 5 deletions
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18
src/backend/utils/sort/tuplesort.c
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@ -91,7 +91,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/sort/tuplesort.c,v 1.63 2006/03/07 19:06:50 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/sort/tuplesort.c,v 1.64 2006/03/08 16:59:03 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -296,6 +296,7 @@ struct Tuplesortstate
int *tp_runs; /* # of real runs on each tape */
int *tp_dummy; /* # of dummy runs for each tape (D[]) */
int *tp_tapenum; /* Actual tape numbers (TAPE[]) */
int activeTapes; /* # of active input tapes in merge pass */
/*
* These variables are used after completion of sorting to keep track of
@ -943,9 +944,15 @@ tuplesort_performsort(Tuplesortstate *state)
#ifdef TRACE_SORT
if (trace_sort)
elog(LOG, "performsort done%s: %s",
(state->status == TSS_FINALMERGE) ? " (except final merge)" : "",
pg_rusage_show(&state->ru_start));
{
if (state->status == TSS_FINALMERGE)
elog(LOG, "performsort done (except %d-way final merge): %s",
state->activeTapes,
pg_rusage_show(&state->ru_start));
else
elog(LOG, "performsort done: %s",
pg_rusage_show(&state->ru_start));
}
#endif
MemoryContextSwitchTo(oldcontext);
@ -1566,7 +1573,7 @@ mergeonerun(Tuplesortstate *state)
#ifdef TRACE_SORT
if (trace_sort)
elog(LOG, "finished merge step: %s",
elog(LOG, "finished %d-way merge step: %s", state->activeTapes,
pg_rusage_show(&state->ru_start));
#endif
}
@ -1614,6 +1621,7 @@ beginmerge(Tuplesortstate *state)
activeTapes++;
}
}
state->activeTapes = activeTapes;
/*
* Initialize space allocation to let each active input tape have an equal