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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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6
src/backend/commands/dbcommands.c
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@@ -15,7 +15,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.151 2005/02/26 18:43:33 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.152 2005/03/04 20:21:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -339,7 +339,7 @@ createdb(const CreatedbStmt *stmt)
* up-to-date for the copy. (We really only need to flush buffers for
* the source database, but bufmgr.c provides no API for that.)
*/
BufferSync(-1, -1);
BufferSync();
/*
* Close virtual file descriptors so the kernel has more available for
@@ -1201,7 +1201,7 @@ dbase_redo(XLogRecPtr lsn, XLogRecord *record)
* up-to-date for the copy. (We really only need to flush buffers for
* the source database, but bufmgr.c provides no API for that.)
*/
BufferSync(-1, -1);
BufferSync();
#ifndef WIN32