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Replace the BufMgrLock with separate locks on the lookup hashtable and

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the freelist, plus per-buffer spinlocks that protect access to individual
shared buffer headers.  This requires abandoning a global freelist (since
the freelist is a global contention point), which shoots down ARC and 2Q
as well as plain LRU management.  Adopt a clock sweep algorithm instead.
Preliminary results show substantial improvement in multi-backend situations.
This commit is contained in:
Tom Lane
2005-03-04 20:21:07 +00:00
parent 5592a6cf46
commit 5d5087363d
18 changed files with 1410 additions and 1932 deletions
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3
src/backend/commands/vacuum.c
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@@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.302 2005/02/26 18:43:33 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.303 2005/03/04 20:21:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -36,7 +36,6 @@
#include "commands/vacuum.h"
#include "executor/executor.h"
#include "miscadmin.h"
#include "storage/buf_internals.h"
#include "storage/freespace.h"
#include "storage/sinval.h"
#include "storage/smgr.h"