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Begin purging dirty pages from the cache once 90% of the cache is dirty (insteadof waiting until it is 100% dirty). This improves performance in some circumstances by effectively reserving 10% of the configured page-cache for frequently reused read-only pages. (CVS 6341)

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FossilOrigin-Name: 823fe7f5551e121e211d1ede606a7ce7487ffe0d
This commit is contained in:
danielk1977
2009-03-05 14:59:39 +00:00
parent c427740b78
commit 6fa0fe13f0
4 changed files with 25 additions and 23 deletions
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28
test/pcache.test
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@ -11,7 +11,7 @@
#
# This file is focused on testing the pcache module.
#
# $Id: pcache.test,v 1.3 2009/01/07 15:33:46 drh Exp $
# $Id: pcache.test,v 1.4 2009/03/05 14:59:40 danielk1977 Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
@ -30,11 +30,11 @@ do_test pcache-1.1 {
do_test pcache-1.2 {
sqlite3 db test.db
execsql {
PRAGMA cache_size=10;
PRAGMA cache_size=12;
PRAGMA auto_vacuum=0;
}
pcache_stats
} {current 1 max 10 min 10 recyclable 1}
} {current 1 max 12 min 10 recyclable 1}
do_test pcache-1.3 {
execsql {
@ -46,7 +46,7 @@ do_test pcache-1.3 {
CREATE TABLE t5(a, b, c);
}
pcache_stats
} {current 6 max 10 min 10 recyclable 0}
} {current 6 max 12 min 10 recyclable 0}
do_test pcache-1.4 {
execsql {
@ -56,13 +56,13 @@ do_test pcache-1.4 {
CREATE TABLE t9(a, b, c);
}
pcache_stats
} {current 10 max 10 min 10 recyclable 0}
} {current 10 max 12 min 10 recyclable 0}
do_test pcache-1.5 {
sqlite3 db2 test.db
execsql "PRAGMA cache_size=10" db2
pcache_stats
} {current 11 max 20 min 20 recyclable 1}
} {current 11 max 22 min 20 recyclable 1}
do_test pcache-1.6.1 {
execsql {
@ -70,7 +70,7 @@ do_test pcache-1.6.1 {
SELECT * FROM sqlite_master;
} db2
pcache_stats
} {current 11 max 20 min 20 recyclable 0}
} {current 11 max 22 min 20 recyclable 0}
# At this point connection db2 has a read lock on the database file and a
# single pinned page in its cache. Connection [db] is holding 10 dirty
@ -87,16 +87,18 @@ do_test pcache-1.6.2 {
CREATE INDEX i7 ON t7(a, b);
CREATE INDEX i8 ON t8(a, b);
CREATE INDEX i9 ON t9(a, b);
CREATE INDEX i10 ON t9(a, b);
CREATE INDEX i11 ON t9(a, b);
}
pcache_stats
} {current 20 max 20 min 20 recyclable 0}
} {current 23 max 22 min 20 recyclable 0}
do_test pcache-1.7 {
execsql {
CREATE TABLE t10(a, b, c);
}
pcache_stats
} {current 21 max 20 min 20 recyclable 0}
} {current 24 max 22 min 20 recyclable 0}
# Rolling back the transaction held by db2 at this point releases a pinned
# page. Because the number of allocated pages is greater than the
@ -106,22 +108,22 @@ do_test pcache-1.7 {
do_test pcache-1.8 {
execsql {ROLLBACK} db2
pcache_stats
} {current 20 max 20 min 20 recyclable 0}
} {current 23 max 22 min 20 recyclable 0}
do_test pcache-1.9 {
execsql COMMIT
pcache_stats
} {current 20 max 20 min 20 recyclable 20}
} {current 22 max 22 min 20 recyclable 22}
do_test pcache-1.10 {
db2 close
pcache_stats
} {current 10 max 10 min 10 recyclable 10}
} {current 12 max 12 min 10 recyclable 12}
do_test pcache-1.11 {
execsql { PRAGMA cache_size = 20 }
pcache_stats
} {current 10 max 20 min 10 recyclable 10}
} {current 12 max 20 min 10 recyclable 12}
do_test pcache-1.12 {
execsql {