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Improve bulk-insert performance by keeping the current target buffer pinned

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(but not locked, as that would risk deadlocks).  Also, make it work in a small
ring of buffers to avoid having bulk inserts trash the whole buffer arena.

Robert Haas, after an idea of Simon Riggs'.
This commit is contained in:
Tom Lane
2008-11-06 20:51:15 +00:00
parent cdc197cf31
commit 85e2cedf98
12 changed files with 203 additions and 84 deletions
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6
src/backend/storage/buffer/README
View File

@ -1,4 +1,4 @@
$PostgreSQL: pgsql/src/backend/storage/buffer/README,v 1.14 2008/03/21 13:23:28 momjian Exp $
$PostgreSQL: pgsql/src/backend/storage/buffer/README,v 1.15 2008/11/06 20:51:14 tgl Exp $
Notes About Shared Buffer Access Rules
======================================
@ -235,6 +235,10 @@ buffers were sent to the freelist, which was effectively a buffer ring of 1
buffer, resulting in excessive WAL flushing. Allowing VACUUM to update
256KB between WAL flushes should be more efficient.
Bulk writes work similarly to VACUUM. Currently this applies only to
COPY IN and CREATE TABLE AS SELECT. (Might it be interesting to make
seqscan UPDATE and DELETE use the bulkwrite strategy?)
Background Writer's Processing
------------------------------

5
src/backend/storage/buffer/freelist.c
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/freelist.c,v 1.64 2008/01/01 19:45:51 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/freelist.c,v 1.65 2008/11/06 20:51:15 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -384,6 +384,9 @@ GetAccessStrategy(BufferAccessStrategyType btype)
case BAS_BULKREAD:
ring_size = 256 * 1024 / BLCKSZ;
break;
case BAS_BULKWRITE:
ring_size = 256 * 1024 / BLCKSZ;
break;
case BAS_VACUUM:
ring_size = 256 * 1024 / BLCKSZ;
break;