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

(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

manifest

@@ -1,5 +1,5 @@
-C Fix\sfor\s[54844eea3f]:\sDo\snot\screate\sautomatic\sindexes\son\scorrelated\ssub-queries.
-D 2011-07-08T16:10:54.482
+C Change\sthe\sdefault\schunk\ssize\son\stest_multiplex.c\sto\s2147418112\sbytes\n(formerly\s1073741824\sbytes)\sand\smake\sthe\sdefault\sconfigurable\sat\scompile-time\nusing\sSQLITE_MULTIPLEX_CHUNK_SIZE\sand\sat\srun-time\susing\sthe\s"chunksize"\nURI\squery\sparameter.\s\sAdd\ssupport\sfo\stest_multiplex\sto\sthe\sshell.
+D 2011-07-08T17:02:57.508
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in c1d7a7f4fd8da6b1815032efca950e3d5125407e
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -180,7 +180,7 @@ F src/random.c cd4a67b3953b88019f8cd4ccd81394a8ddfaba50
 F src/resolve.c 36368f44569208fa074e61f4dd0b6c4fb60ca2b4
 F src/rowset.c 69afa95a97c524ba6faf3805e717b5b7ae85a697
 F src/select.c e9d74f943c195f2673990febd3a455b421964ca0
-F src/shell.c 0e0173b3e79d956368013e759f084caa7995ecb1
+F src/shell.c bbe7818ff5bc8614105ceb81ad67b8bdc0b671dd
 F src/sqlite.h.in 4b7255c10d39c5faf089dbd29cde7c367ff39f1f
 F src/sqlite3ext.h 1a1a4f784aa9c3b00edd287940197de52487cd93
 F src/sqliteInt.h ba4a6d6288efb25b84bc0d7d0aaf80f9b42523ba
@@ -213,7 +213,7 @@ F src/test_intarray.h 489edb9068bb926583445cb02589344961054207
 F src/test_journal.c 03313c693cca72959dcaaf79f8d76f21c01e19ff
 F src/test_loadext.c df586c27176e3c2cb2e099c78da67bf14379a56e
 F src/test_malloc.c 7ca7be34e0e09ef0ed6619544552ed95732e41f6
-F src/test_multiplex.c a7457a1ac46964b7f897d75ecfd447410ec067e6
+F src/test_multiplex.c 0585bb12a98521795344f67d17d77e258ea7b57f
 F src/test_multiplex.h e99c571bc4968b7a9363b661481f3934bfead61d
 F src/test_mutex.c a6bd7b9cf6e19d989e31392b06ac8d189f0d573e
 F src/test_onefile.c 40cf9e212a377a6511469384a64b01e6e34b2eec
@@ -951,7 +951,7 @@ F tool/symbols.sh caaf6ccc7300fd43353318b44524853e222557d5
 F tool/tostr.awk 11760e1b94a5d3dcd42378f3cc18544c06cfa576
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
 F tool/warnings.sh 2ebae31e1eb352696f3c2f7706a34c084b28c262
-P 18501dd1a8aa8299c091c36e35b9a10a29d4467b
-R f7d91718025095a30a469ac579a4e46b
-U dan
-Z fc4423411c04e2aaef6760d45d2bd142
+P 9f14fa56ba31afe3de8b0cf26ed09573a2cc2283
+R e83eed2583035b436dc963e6112fe3df
+U drh
+Z 8b9b6b1bb1eb76d53c04bd9c864821f0

manifest.uuid

@@ -1 +1 @@
-9f14fa56ba31afe3de8b0cf26ed09573a2cc2283
+e305b5a931374e2a1d2e66ea0a1248b9d4aecb19

src/shell.c

@@ -2632,6 +2632,9 @@ static const char zOptions[] =
 #ifdef SQLITE_ENABLE_VFSTRACE
   "   -vfstrace            enable tracing of all VFS calls\n"
 #endif
+#ifdef SQLITE_ENABLE_MULTIPLEX
+  "   -multiplex           enable the multiplexor VFS\n"
+#endif
 ;
 static void usage(int showDetail){
   fprintf(stderr,
@@ -2732,6 +2735,11 @@ int main(int argc, char **argv){
          int makeDefault
       );
       vfstrace_register("trace",0,(int(*)(const char*,void*))fputs,stderr,1);
+#endif
+#ifdef SQLITE_ENABLE_MULTIPLEX
+    }else if( strcmp(argv[i],"-multiplex")==0 ){
+      extern int sqlite3_multiple_initialize(const char*,int);
+      sqlite3_multiplex_initialize(0, 1);
 #endif
     }else if( strcmp(argv[i],"-vfs")==0 ){
       sqlite3_vfs *pVfs = sqlite3_vfs_find(argv[++i]);
@@ -2851,8 +2859,14 @@ int main(int argc, char **argv){
       i++;
     }else if( strcmp(z,"-vfs")==0 ){
       i++;
+#ifdef SQLITE_ENABLE_VFSTRACE
     }else if( strcmp(z,"-vfstrace")==0 ){
       i++;
+#endif
+#ifdef SQLITE_ENABLE_MULTIPLEX
+    }else if( strcmp(z,"-multiplex")==0 ){
+      i++;
+#endif
     }else if( strcmp(z,"-help")==0 || strcmp(z, "--help")==0 ){
       usage(1);
     }else{

src/test_multiplex.c

@@ -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);