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Memory-mapped I/O is now on by default. The "PRAGMA mmap_limit(N)" can be

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used to issue a hint to the VFS to limit mmap space to N bytes.  The VFS
is free to ignore that hint if desired.  However, if "PRAGMA mmap_limit(0)"
is used, xFetch is never called.

FossilOrigin-Name: 1b37c4effdd03aa2ea938a71b4f22ed27391689b
This commit is contained in:
drh
2013-03-25 23:09:28 +00:00
parent d1ab8065c1
commit 0d0614bdc6
18 changed files with 84 additions and 92 deletions
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test/mmap1.test
+10 -11
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@@ -23,16 +23,16 @@ proc nRead {db} {
return $stats(read)
}
foreach {t mmap_size nRead c2init} {
1.1 { PRAGMA mmap_size = -65536 } 4 {}
1.2 { PRAGMA mmap_size = -50 } 156 {}
1.3 { PRAGMA mmap_size = 0 } 344 {}
1.4 { PRAGMA mmap_size = -65536 } 4 {PRAGMA mmap_size = -65536}
1.5 { PRAGMA mmap_size = -50 } 156 {PRAGMA mmap_size = -65536}
1.6 { PRAGMA mmap_size = 0 } 344 {PRAGMA mmap_size = -65536}
foreach {t mmap_limit nRead c2init} {
1.1 { PRAGMA mmap_limit = 70000000 } 4 {}
1.2 { PRAGMA mmap_limit = 51200 } 156 {}
1.3 { PRAGMA mmap_limit = 0 } 344 {}
1.4 { PRAGMA mmap_limit = 70000000 } 4 {PRAGMA mmap_limit = 70000000 }
1.5 { PRAGMA mmap_limit = 51200 } 156 {PRAGMA mmap_limit = 70000000 }
1.6 { PRAGMA mmap_limit = 0 } 344 {PRAGMA mmap_limit = 70000000 }
} {
do_multiclient_test tn {
sql1 $mmap_size
sql1 $mmap_limit
sql2 $c2init
code2 {
@@ -78,7 +78,7 @@ foreach {t mmap_size nRead c2init} {
} {64 ok 149}
# Check that the number of pages read by connection 1 indicates that the
# "PRAGMA mmap_size" command worked.
# "PRAGMA mmap_limit" command worked.
do_test $t.$tn.5 { nRead db } $nRead
}
}
@@ -95,7 +95,7 @@ db func rblob rblob
do_execsql_test 2.1 {
PRAGMA auto_vacuum = 1;
PRAGMA mmap_size = -65536;
PRAGMA mmap_limit = 70000000;
PRAGMA journal_mode = wal;
CREATE TABLE t1(a, b, UNIQUE(a, b));
INSERT INTO t1 VALUES(rblob(500), rblob(500));
@@ -130,4 +130,3 @@ do_execsql_test 2.4 {
} {0 24 24}
finish_test