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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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4
src/btree.c
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@@ -2134,11 +2134,11 @@ int sqlite3BtreeSetCacheSize(Btree *p, int mxPage){
** Change the limit on the amount of the database file that may be
** memory mapped.
*/
int sqlite3BtreeSetMmapSize(Btree *p, int nMap){
int sqlite3BtreeSetMmapLimit(Btree *p, sqlite3_int64 mxMmap){
BtShared *pBt = p->pBt;
assert( sqlite3_mutex_held(p->db->mutex) );
sqlite3BtreeEnter(p);
sqlite3PagerSetMmapsize(pBt->pPager, nMap);
sqlite3PagerSetMmapLimit(pBt->pPager, mxMmap);
sqlite3BtreeLeave(p);
return SQLITE_OK;
}