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Cost based vacuum delay feature.

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Jan
This commit is contained in:
Jan Wieck
2004-02-06 19:36:18 +00:00
parent 687d7cf355
commit f425b605f4
9 changed files with 189 additions and 8 deletions
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67
src/backend/commands/vacuumlazy.c
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@@ -31,7 +31,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.34 2004/02/03 17:34:02 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.35 2004/02/06 19:36:17 wieck Exp $
*
*-------------------------------------------------------------------------
*/
@@ -148,6 +148,11 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
vac_open_indexes(onerel, &nindexes, &Irel);
hasindex = (nindexes > 0);
/* Turn on vacuum cost accounting */
if (VacuumCostNaptime > 0)
VacuumCostActive = true;
VacuumCostBalance = 0;
/* Do the vacuuming */
lazy_scan_heap(onerel, vacrelstats, Irel, nindexes);
@@ -168,6 +173,9 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt)
/* Update shared free space map with final free space info */
lazy_update_fsm(onerel, vacrelstats);
/* Turn off vacuum cost accounting */
VacuumCostActive = false;
/* Update statistics in pg_class */
vac_update_relstats(RelationGetRelid(onerel), vacrelstats->rel_pages,
vacrelstats->rel_tuples, hasindex);
@@ -228,6 +236,25 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
CHECK_FOR_INTERRUPTS();
/*
* Do the napping in a cost based vacuum.
*/
if (VacuumCostActive && !InterruptPending &&
VacuumCostBalance >= VacuumCostLimit)
{
int msec;
msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
if (msec < VacuumCostNaptime * 4)
PG_MSLEEP(msec);
else
PG_MSLEEP(VacuumCostNaptime * 4);
VacuumCostBalance = 0;
CHECK_FOR_INTERRUPTS();
}
/*
* If we are close to overrunning the available space for
* dead-tuple TIDs, pause and do a cycle of vacuuming before we
@@ -469,6 +496,25 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats)
CHECK_FOR_INTERRUPTS();
/*
* Do the napping in a cost based vacuum.
*/
if (VacuumCostActive && !InterruptPending &&
VacuumCostBalance >= VacuumCostLimit)
{
int msec;
msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
if (msec < VacuumCostNaptime * 4)
PG_MSLEEP(msec);
else
PG_MSLEEP(VacuumCostNaptime * 4);
VacuumCostBalance = 0;
CHECK_FOR_INTERRUPTS();
}
tblk = ItemPointerGetBlockNumber(&vacrelstats->dead_tuples[tupindex]);
buf = ReadBuffer(onerel, tblk);
LockBufferForCleanup(buf);
@@ -800,6 +846,25 @@ count_nondeletable_pages(Relation onerel, LVRelStats *vacrelstats)
CHECK_FOR_INTERRUPTS();
/*
* Do the napping in a cost based vacuum.
*/
if (VacuumCostActive && !InterruptPending &&
VacuumCostBalance >= VacuumCostLimit)
{
int msec;
msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
if (msec < VacuumCostNaptime * 4)
PG_MSLEEP(msec);
else
PG_MSLEEP(VacuumCostNaptime * 4);
VacuumCostBalance = 0;
CHECK_FOR_INTERRUPTS();
}
blkno--;
buf = ReadBuffer(onerel, blkno);