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When possible, use memory mapping when appending new pages to a database file.

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FossilOrigin-Name: 14135da3cdbafd699563a29608f32347cda28338
This commit is contained in:
dan
2013-03-20 14:26:59 +00:00
parent eecc398374
commit eb97b29345
8 changed files with 70 additions and 24 deletions
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18
src/pager.c
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@@ -3854,7 +3854,7 @@ static int pagerSyncHotJournal(Pager *pPager){
*/
static int pagerUnmap(Pager *pPager){
if( pPager->pMap ){
sqlite3OsMremap(pPager->fd, 0, pPager->nMap, 0, &pPager->pMap);
sqlite3OsMremap(pPager->fd, 0, 0, pPager->nMap, 0, &pPager->pMap);
pPager->nMap = 0;
pPager->nMapValid = 0;
}
@@ -3864,7 +3864,7 @@ static int pagerUnmap(Pager *pPager){
/*
** Create, or recreate, the memory mapping of the database file.
*/
static int pagerMap(Pager *pPager){
static int pagerMap(Pager *pPager, int bExtend){
int rc = SQLITE_OK; /* Return code */
Pgno nPg; /* Size of mapping to request in pages */
i64 sz; /* Size of mapping to request in bytes */
@@ -3882,7 +3882,8 @@ static int pagerMap(Pager *pPager){
if( sz>pPager->nMapLimit ) sz = pPager->nMapLimit;
if( sz!=pPager->nMapValid ){
rc = sqlite3OsMremap(pPager->fd, 0, pPager->nMap, sz, &pPager->pMap);
int flags = (bExtend ? SQLITE_MREMAP_EXTEND : 0);
rc = sqlite3OsMremap(pPager->fd, flags, 0, pPager->nMap, sz, &pPager->pMap);
if( rc==SQLITE_OK ){
assert( pPager->pMap!=0 );
pPager->nMap = sz;
@@ -4246,10 +4247,17 @@ static int pager_write_pagelist(Pager *pPager, PgHdr *pList){
** file size will be.
*/
assert( rc!=SQLITE_OK || isOpen(pPager->fd) );
if( rc==SQLITE_OK && pPager->dbSize>pPager->dbHintSize ){
if( rc==SQLITE_OK
&& (pList->pDirty ? pPager->dbSize : pList->pgno+1)>pPager->dbHintSize
){
sqlite3_int64 szFile = pPager->pageSize * (sqlite3_int64)pPager->dbSize;
sqlite3OsFileControlHint(pPager->fd, SQLITE_FCNTL_SIZE_HINT, &szFile);
pPager->dbHintSize = pPager->dbSize;
if( pPager->nMmapOut==0 && pPager->nMapLimit>0 ){
pPager->dbFileSize = pPager->dbSize;
pagerMap(pPager, 1);
}
}
while( rc==SQLITE_OK && pList ){
@@ -5273,7 +5281,7 @@ int sqlite3PagerAcquire(
if( bMmapOk ){
if( pPager->pMap==0 || (pPager->bMapResize && pPager->nMmapOut==0) ){
rc = pagerMap(pPager);
rc = pagerMap(pPager, 0);
}
if( rc==SQLITE_OK && pPager->nMap>=((i64)pgno * pPager->pageSize) ){
if( pPager->eState>PAGER_READER ){