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Commite7fa73d

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committed
Integrate dynahash patch by Alexander Alexeev. This fix lock contension for shared memory
1 parent18a94a2 commite7fa73d

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9 files changed

+140
-87
lines changed

9 files changed

+140
-87
lines changed

‎contrib/pg_stat_statements/pg_stat_statements.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -495,7 +495,7 @@ pgss_shmem_startup(void)
495495
info.hash=pgss_hash_fn;
496496
info.match=pgss_match_fn;
497497
pgss_hash=ShmemInitHash("pg_stat_statements hash",
498-
pgss_max,pgss_max,
498+
pgss_max,
499499
&info,
500500
HASH_ELEM |HASH_FUNCTION |HASH_COMPARE);
501501

‎doc/src/sgml/release-pro-9.5.sgml‎

Lines changed: 7 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -103,11 +103,17 @@
103103
and queries which use large number of resoures
104104
-->
105105
<para>Resource owner optimisation for complicated queries: now
106-
107106
resource lists has constant access time, which improves performance
108107
for heavily partitioned tables and queries which use hundreds of
109108
tables.
110109
</para>
110+
</listitem>
111+
<listitem>
112+
<para>
113+
Fix lock contention for HASHHDR.mutex. (Alexander Alexeev). This
114+
prevents Postgres from waiting for lock up to several milliseconds
115+
when modifying state, shared between processes.
116+
</para>
111117
</listitem>
112118
</itemizedlist>
113119
</listitem>

‎src/backend/storage/buffer/buf_table.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -62,7 +62,7 @@ InitBufTable(int size)
6262
info.num_partitions=NUM_BUFFER_PARTITIONS;
6363

6464
SharedBufHash=ShmemInitHash("Shared Buffer Lookup Table",
65-
size,size,
65+
size,
6666
&info,
6767
HASH_ELEM |HASH_BLOBS |HASH_PARTITION);
6868
}

‎src/backend/storage/ipc/shmem.c‎

Lines changed: 2 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -240,7 +240,7 @@ InitShmemIndex(void)
240240
hash_flags=HASH_ELEM;
241241

242242
ShmemIndex=ShmemInitHash("ShmemIndex",
243-
SHMEM_INDEX_SIZE,SHMEM_INDEX_SIZE,
243+
SHMEM_INDEX_SIZE,
244244
&info,hash_flags);
245245
}
246246

@@ -258,17 +258,12 @@ InitShmemIndex(void)
258258
* exceeded substantially (since it's used to compute directory size and
259259
* the hash table buckets will get overfull).
260260
*
261-
* init_size is the number of hashtable entries to preallocate. For a table
262-
* whose maximum size is certain, this should be equal to max_size; that
263-
* ensures that no run-time out-of-shared-memory failures can occur.
264-
*
265261
* Note: before Postgres 9.0, this function returned NULL for some failure
266262
* cases. Now, it always throws error instead, so callers need not check
267263
* for NULL.
268264
*/
269265
HTAB*
270266
ShmemInitHash(constchar*name,/* table string name for shmem index */
271-
longinit_size,/* initial table size */
272267
longmax_size,/* max size of the table */
273268
HASHCTL*infoP,/* info about key and bucket size */
274269
inthash_flags)/* info about infoP */
@@ -302,7 +297,7 @@ ShmemInitHash(const char *name, /* table string name for shmem index */
302297
/* Pass location of hashtable header to hash_create */
303298
infoP->hctl= (HASHHDR*)location;
304299

305-
returnhash_create(name,init_size,infoP,hash_flags);
300+
returnhash_create(name,max_size,infoP,hash_flags);
306301
}
307302

308303
/*

‎src/backend/storage/lmgr/lock.c‎

Lines changed: 1 addition & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -373,16 +373,14 @@ void
373373
InitLocks(void)
374374
{
375375
HASHCTLinfo;
376-
longinit_table_size,
377-
max_table_size;
376+
longmax_table_size;
378377
boolfound;
379378

380379
/*
381380
* Compute init/max size to request for lock hashtables. Note these
382381
* calculations must agree with LockShmemSize!
383382
*/
384383
max_table_size=NLOCKENTS();
385-
init_table_size=max_table_size /2;
386384

387385
/*
388386
* Allocate hash table for LOCK structs. This stores per-locked-object
@@ -394,14 +392,12 @@ InitLocks(void)
394392
info.num_partitions=NUM_LOCK_PARTITIONS;
395393

396394
LockMethodLockHash=ShmemInitHash("LOCK hash",
397-
init_table_size,
398395
max_table_size,
399396
&info,
400397
HASH_ELEM |HASH_BLOBS |HASH_PARTITION);
401398

402399
/* Assume an average of 2 holders per lock */
403400
max_table_size *=2;
404-
init_table_size *=2;
405401

406402
/*
407403
* Allocate hash table for PROCLOCK structs. This stores
@@ -413,7 +409,6 @@ InitLocks(void)
413409
info.num_partitions=NUM_LOCK_PARTITIONS;
414410

415411
LockMethodProcLockHash=ShmemInitHash("PROCLOCK hash",
416-
init_table_size,
417412
max_table_size,
418413
&info,
419414
HASH_ELEM |HASH_FUNCTION |HASH_PARTITION);

‎src/backend/storage/lmgr/predicate.c‎

Lines changed: 0 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1115,7 +1115,6 @@ InitPredicateLocks(void)
11151115
info.num_partitions=NUM_PREDICATELOCK_PARTITIONS;
11161116

11171117
PredicateLockTargetHash=ShmemInitHash("PREDICATELOCKTARGET hash",
1118-
max_table_size,
11191118
max_table_size,
11201119
&info,
11211120
HASH_ELEM |HASH_BLOBS |
@@ -1143,7 +1142,6 @@ InitPredicateLocks(void)
11431142
info.num_partitions=NUM_PREDICATELOCK_PARTITIONS;
11441143

11451144
PredicateLockHash=ShmemInitHash("PREDICATELOCK hash",
1146-
max_table_size,
11471145
max_table_size,
11481146
&info,
11491147
HASH_ELEM |HASH_FUNCTION |
@@ -1224,7 +1222,6 @@ InitPredicateLocks(void)
12241222
info.entrysize=sizeof(SERIALIZABLEXID);
12251223

12261224
SerializableXidHash=ShmemInitHash("SERIALIZABLEXID hash",
1227-
max_table_size,
12281225
max_table_size,
12291226
&info,
12301227
HASH_ELEM |HASH_BLOBS |

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