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Change the default chunk size on test_multiplex.c to 2147418112 bytes

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(formerly 1073741824 bytes) and make the default configurable at compile-time
using SQLITE_MULTIPLEX_CHUNK_SIZE and at run-time using the "chunksize"
URI query parameter.  Add support fo test_multiplex to the shell.

FossilOrigin-Name: e305b5a931374e2a1d2e66ea0a1248b9d4aecb19
This commit is contained in:
drh
2011-07-08 17:02:57 +00:00
parent da79cf0cc9
commit 6f25e89d27
4 changed files with 40 additions and 13 deletions
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21
src/test_multiplex.c
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@@ -45,6 +45,7 @@
#include "sqlite3.h"
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include "test_multiplex.h"
#ifndef SQLITE_CORE
@@ -78,20 +79,26 @@
/************************ Shim Definitions ******************************/
#define SQLITE_MULTIPLEX_VFS_NAME "multiplex"
#ifndef SQLITE_MULTIPLEX_VFS_NAME
# define SQLITE_MULTIPLEX_VFS_NAME "multiplex"
#endif
/* This is the limit on the chunk size. It may be changed by calling
** the xFileControl() interface. It will be rounded up to a
** multiple of MAX_PAGE_SIZE. We default it here to 1GB.
** multiple of MAX_PAGE_SIZE. We default it here to 2GiB less 64KiB.
*/
#define SQLITE_MULTIPLEX_CHUNK_SIZE (MAX_PAGE_SIZE*16384)
#ifndef SQLITE_MULTIPLEX_CHUNK_SIZE
# define SQLITE_MULTIPLEX_CHUNK_SIZE 2147418112
#endif
/* Default limit on number of chunks. Care should be taken
** so that values for chunks numbers fit in the SQLITE_MULTIPLEX_EXT_FMT
** format specifier. It may be changed by calling
** the xFileControl() interface.
*/
#define SQLITE_MULTIPLEX_MAX_CHUNKS 32
#ifndef SQLITE_MULTIPLEX_MAX_CHUNKS
# define SQLITE_MULTIPLEX_MAX_CHUNKS 32
#endif
/* If SQLITE_MULTIPLEX_EXT_OVWR is defined, the
** last SQLITE_MULTIPLEX_EXT_SZ characters of the
@@ -431,12 +438,18 @@ static int multiplexOpen(
}
if( rc==SQLITE_OK ){
const char *zChunkSize;
/* assign pointers to extra space allocated */
char *p = (char *)&pGroup[1];
pMultiplexOpen->pGroup = pGroup;
memset(pGroup, 0, sz);
pGroup->bEnabled = -1;
pGroup->nChunkSize = SQLITE_MULTIPLEX_CHUNK_SIZE;
zChunkSize = sqlite3_uri_parameter(zName, "chunksize");
if( zChunkSize ){
int n = atoi(zChunkSize);
if( n>0 ) pGroup->nChunkSize = (n+0xffff)&~0xffff;
}
pGroup->nMaxChunks = SQLITE_MULTIPLEX_MAX_CHUNKS;
pGroup->pReal = (sqlite3_file **)p;
p += (sizeof(sqlite3_file *)*pGroup->nMaxChunks);