When running this program with Apple's Instruments memory profiler leaks are
reported when the tree is balanced, stack crawls are related to the page cache.
1 sqlite3memtest sqlite3MemMalloc
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:21312
2 sqlite3memtest mallocWithAlarm
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:24996
3 sqlite3memtest sqlite3Malloc
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:25026
4 sqlite3memtest pcache1Alloc
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:45870
5 sqlite3memtest pcache1AllocPage
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:45966
6 sqlite3memtest pcache1FetchStage2
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:46436
7 sqlite3memtest pcache1FetchNoMutex
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:46540
8 sqlite3memtest pcache1Fetch
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:46582
9 sqlite3memtest sqlite3PcacheFetch
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:45045
10 sqlite3memtest getPageNormal
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:52859
11 sqlite3memtest sqlite3PagerGet
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:53043
12 sqlite3memtest btreeGetPage
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:61558
13 sqlite3memtest btreeGetUnusedPage
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:61687
14 sqlite3memtest allocateBtreePage
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:65510
15 sqlite3memtest balance_quick
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:66464
16 sqlite3memtest balance
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:67554
17 sqlite3memtest sqlite3BtreeInsert
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:67811
18 sqlite3memtest sqlite3VdbeExec
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:83397
19 sqlite3memtest sqlite3Step
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:77352
20 sqlite3memtest sqlite3_step
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:77416
21 sqlite3memtest sqlite3_exec
/KentDev/sqlite3memtest/sqlite3memtest/sqlite3.c:111930
22 sqlite3memtest main /KentDev/sqlite3memtest/sqlite3memtest/main.c:99
If I change the page_size pragma to 4096 (or leave it at the default) no leaks
are reported by Instruments.
A page_size of 16384 will also report leaks.
I tried running valgrind on the app and but it doesn't report leaks. I think I
see a similar leak if I interrupt the program. (valgrind reports them as a
possible leak in this case) This is starting to make me think it may be a
false positive but just thought I would check to make sure it isn't a leak.
I've included the project which has the 3.20.1 amalgamation included within it.
Thanks,
Kent Carlson
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "sqlite3.h"
static int showResults(void *notUsed, int argc, char **argv, char **colv){
int i;
for(i=0; i<argc; i++){
printf("%s = %s\n", colv[i], argv[i] ? argv[i] : "NULL");
}
return 0;
}
static void checkForError( char** errorMessage ) {
if( *errorMessage ) {
fprintf(stderr, "ERROR: %s\n", *errorMessage);
sqlite3_free(*errorMessage);
*errorMessage = 0;
}
}
#define MAX_BLOB_SIZE 20000
int main(int argc, char **argv){
for( int times=0; times < 200; times++) {
sqlite3 *db;
unlink("memtest.db");
int resultCode = sqlite3_open("memtest.db", &db);
if( resultCode != SQLITE_OK ){
fprintf(stderr, "cannot open 'memtest.db'\n");
return 1;
}
char *errorMessage = 0;
sqlite3_exec(db, "PRAGMA page_size = 8192;", showResults, 0,
&errorMessage );
checkForError( &errorMessage );
sqlite3_exec(db, "PRAGMA journal_mode = WAL;", showResults, 0,
&errorMessage );
checkForError( &errorMessage );
sqlite3_exec(db, "PRAGMA synchronous = 1;", showResults, 0,
&errorMessage );
checkForError( &errorMessage );
sqlite3_exec(db, "PRAGMA foreign_keys = true;", showResults, 0,
&errorMessage );
checkForError( &errorMessage );
sqlite3_exec(db,
"CREATE TABLE docs( localDocId INTEGER
PRIMARY KEY,"
" fullDocId TEXT UNIQUE NOT NULL,"
" winningRevSequence INTEGER
REFERENCES revs( sequence ) ON DELETE SET NULL,"
" mostRecentRevSequence INTEGER
REFERENCES revs( sequence ) ON DELETE SET NULL,"
" deleted BOOLEAN DEFAULT 0,"
" hasConflicts BOOLEAN DEFAULT 0,"
" annotation BLOB );", showResults, 0,
&errorMessage );
checkForError( &errorMessage );
sqlite3_exec(db,
"CREATE TABLE revs( sequence INTEGER
PRIMARY KEY AUTOINCREMENT,"
" localDocId INTEGER NOT NULL
REFERENCES docs( localDocId ) ON DELETE CASCADE,"
" revId TEXT NOT NULL COLLATE BINARY,"
" parentRevSequence INTEGER REFERENCES
revs( sequence ) ON DELETE SET NULL,"
" current BOOLEAN,"
" deleted BOOLEAN DEFAULT 0,"
" content BLOB );", showResults, 0,
&errorMessage );
checkForError( &errorMessage );
char blob[MAX_BLOB_SIZE];
memset( blob, 'a', MAX_BLOB_SIZE );
blob[8000] = 0;
int revLocalDocId = 1;
for( int localId = 1; localId < 200; localId++ ) {
char fullDocId[33];
char revId[33];
sprintf( fullDocId, "%032d", localId );
sprintf( revId, "%032d", revLocalDocId );
revLocalDocId = revLocalDocId + 1;
char insertStatement[1024+MAX_BLOB_SIZE];
sprintf( insertStatement, "INSERT INTO docs( fullDocId
) VALUES( '%s' )", fullDocId );
sqlite3_exec(db, insertStatement, showResults, 0,
&errorMessage);
checkForError( &errorMessage );
sprintf( insertStatement, "INSERT INTO revs(
localDocId, revId, parentRevSequence, current, deleted, content ) VALUES( %d,
'%s', NULL, 1,0, '%s');", localId, revId, blob );
sqlite3_exec(db, insertStatement, showResults, 0,
&errorMessage);
checkForError( &errorMessage );
}
sqlite3_close(db);
}
return 0;
}
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