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For bulk write operations (eg COPY IN), use a ring buffer of 16MB instead

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of the 256KB limit originally enforced by a patch committed 2008-11-06.
Per recent test results, the smaller size resulted in an undesirable decrease
in bulk data loading speed, due to COPY processing frequently getting blocked
for WAL flushing.  This area might need more tweaking later, but this setting
seems to be good enough for 8.4.
This commit is contained in:
Tom Lane
2009-06-22 20:04:28 +00:00
parent 3f1e529e78
commit 6382448cf9
2 changed files with 10 additions and 7 deletions
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8
src/backend/storage/buffer/freelist.c
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@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/freelist.c,v 1.66 2009/01/01 17:23:47 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/freelist.c,v 1.67 2009/06/22 20:04:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -368,9 +368,7 @@ GetAccessStrategy(BufferAccessStrategyType btype)
int ring_size;
/*
* Select ring size to use. See buffer/README for rationales. (Currently
* all cases are the same size, but keep this code structure for
* flexibility.)
* Select ring size to use. See buffer/README for rationales.
*
* Note: if you change the ring size for BAS_BULKREAD, see also
* SYNC_SCAN_REPORT_INTERVAL in access/heap/syncscan.c.
@@ -385,7 +383,7 @@ GetAccessStrategy(BufferAccessStrategyType btype)
ring_size = 256 * 1024 / BLCKSZ;
break;
case BAS_BULKWRITE:
ring_size = 256 * 1024 / BLCKSZ;
ring_size = 16 * 1024 * 1024 / BLCKSZ;
break;
case BAS_VACUUM:
ring_size = 256 * 1024 / BLCKSZ;