database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-10-29 22:49:41 +03:00
Code Activity

Divide the lock manager's shared state into 'partitions', so as to

Browse Source 
reduce contention for the former single LockMgrLock.  Per my recent
proposal.  I set it up for 16 partitions, but on a pgbench test this
gives only a marginal further improvement over 4 partitions --- we need
to test more scenarios to choose the number of partitions.
This commit is contained in:
Tom Lane
2005-12-11 21:02:18 +00:00
parent be8100d64e
commit ec0baf949e
10 changed files with 643 additions and 415 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/include/storage/lock.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/lock.h,v 1.92 2005/12/09 01:22:04 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/lock.h,v 1.93 2005/12/11 21:02:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -19,6 +19,13 @@
#include "storage/shmem.h"
/*
* Number of partitions the shared lock tables are divided into.
*
* See LockTagToPartition() if you change this.
*/
#define NUM_LOCK_PARTITIONS 16
/* originally in procq.h */
typedef struct PROC_QUEUE
{
@@ -348,6 +355,7 @@ typedef struct LOCALLOCK
LOCK *lock; /* associated LOCK object in shared mem */
PROCLOCK *proclock; /* associated PROCLOCK object in shmem */
bool isTempObject; /* true if lock is on a temporary object */
int partition; /* ID of partition containing this lock */
int nLocks; /* total number of times lock is held */
int numLockOwners; /* # of relevant ResourceOwners */
int maxLockOwners; /* allocated size of array */
@@ -389,6 +397,7 @@ typedef enum
*/
extern void InitLocks(void);
extern LockMethod GetLocksMethodTable(const LOCK *lock);
extern int LockTagToPartition(const LOCKTAG *locktag);
extern LockAcquireResult LockAcquire(const LOCKTAG *locktag,
bool isTempObject,
LOCKMODE lockmode,
@@ -406,7 +415,7 @@ extern int LockCheckConflicts(LockMethod lockMethodTable,
LOCK *lock, PROCLOCK *proclock, PGPROC *proc);
extern void GrantLock(LOCK *lock, PROCLOCK *proclock, LOCKMODE lockmode);
extern void GrantAwaitedLock(void);
extern void RemoveFromWaitQueue(PGPROC *proc);
extern void RemoveFromWaitQueue(PGPROC *proc, int partition);
extern Size LockShmemSize(void);
extern bool DeadLockCheck(PGPROC *proc);
extern void DeadLockReport(void);