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Centralize implementation of delay code by creating a pg_usleep()

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subroutine in src/port/pgsleep.c.  Remove platform dependencies from
miscadmin.h and put them in port.h where they belong.  Extend recent
vacuum cost-based-delay patch to apply to VACUUM FULL, ANALYZE, and
non-btree index vacuuming.

By the way, where is the documentation for the cost-based-delay patch?
This commit is contained in:
Tom Lane
2004-02-10 03:42:45 +00:00
parent 87bd956385
commit 58f337a343
16 changed files with 138 additions and 154 deletions
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53
src/backend/commands/vacuum.c
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@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.272 2004/02/10 01:55:25 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.273 2004/02/10 03:42:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -181,6 +181,10 @@ vacuum(VacuumStmt *vacstmt)
if (vacstmt->vacuum)
PreventTransactionChain((void *) vacstmt, stmttype);
/* Turn vacuum cost accounting on or off */
VacuumCostActive = (VacuumCostNaptime > 0);
VacuumCostBalance = 0;
/*
* Send info about dead objects to the statistics collector
*/
@ -374,6 +378,9 @@ vacuum(VacuumStmt *vacstmt)
if (anl_context)
MemoryContextDelete(anl_context);
/* Turn off vacuum cost accounting */
VacuumCostActive = false;
}
/*
@ -1082,7 +1089,7 @@ scan_heap(VRelStats *vacrelstats, Relation onerel,
bool do_reap,
do_frag;
CHECK_FOR_INTERRUPTS();
vacuum_delay_point();
buf = ReadBuffer(onerel, blkno);
page = BufferGetPage(buf);
@ -1528,7 +1535,7 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
blkno > last_move_dest_block;
blkno--)
{
CHECK_FOR_INTERRUPTS();
vacuum_delay_point();
/*
* Forget fraged_pages pages at or after this one; they're no
@ -2311,7 +2318,8 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
i < vacuumed_pages;
i++, curpage++)
{
CHECK_FOR_INTERRUPTS();
vacuum_delay_point();
Assert((*curpage)->blkno < blkno);
if ((*curpage)->offsets_used == 0)
{
@ -2342,7 +2350,8 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
i < num_fraged_pages;
i++, curpage++)
{
CHECK_FOR_INTERRUPTS();
vacuum_delay_point();
Assert((*curpage)->blkno < blkno);
if ((*curpage)->blkno > last_move_dest_block)
break; /* no need to scan any further */
@ -2553,7 +2562,8 @@ vacuum_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages)
for (i = 0, vacpage = vacuum_pages->pagedesc; i < nblocks; i++, vacpage++)
{
CHECK_FOR_INTERRUPTS();
vacuum_delay_point();
if ((*vacpage)->offsets_free > 0)
{
buf = ReadBuffer(onerel, (*vacpage)->blkno);
@ -3164,3 +3174,34 @@ vac_show_rusage(VacRUsage *ru0)
return result;
}
/*
* vacuum_delay_point --- check for interrupts and cost-based delay.
*
* This should be called in each major loop of VACUUM processing,
* typically once per page processed.
*/
void
vacuum_delay_point(void)
{
/* Always check for interrupts */
CHECK_FOR_INTERRUPTS();
/* Nap if appropriate */
if (VacuumCostActive && !InterruptPending &&
VacuumCostBalance >= VacuumCostLimit)
{
int msec;
msec = VacuumCostNaptime * VacuumCostBalance / VacuumCostLimit;
if (msec > VacuumCostNaptime * 4)
msec = VacuumCostNaptime * 4;
pg_usleep(msec * 1000L);
VacuumCostBalance = 0;
/* Might have gotten an interrupt while sleeping */
CHECK_FOR_INTERRUPTS();
}
}