On 4/13/18, king3306 <1809860...@qq.com> wrote: > HI > > I use sqlite3 in embedded arm > > my memory is very small about 4M > > so i want to use MEMSYS5 to limit memory use > > i define DSQLITE_ENABLE_MEMSYS5 1 in sqlite3.c > > compile it > > in my code start i use > > > sqlite3_config(SQLITE_CONFIG_HEAP,malloc(2*1024*1024),2*1024*1024);
sqlite3_config() is a varargs function. SQLITE_CONFIG_HELP wants three additional arguments, but you only gave it two. It might better if you gave it the third argument. I suggest a value of 64. Also, make sure sqlite3_config() returns SQLITE_OK. > sqlite3_config(SQLITE_CONFIG_PAGECACHE,malloc(4*1024),4*1024); Again, you omitted the final argument. And even then, it seems kind of silly to configure a page cache that only holds one page. Start by omitting the SQLITE_CONFIG_PAGECACHE call. That will cause SQLite to you the 2MiB of HEAP that you configured for the cache it needs. > > before open database > > my purpose is to limit memory usage < 2M + 4K > > but i found sqlite3_memory_used=29126656 > > is use 27M?? i can"t understand why > > what sqlite3_memory_used mean ? > > > > > > -- > Sent from: http://sqlite.1065341.n5.nabble.com/ > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > -- D. Richard Hipp d...@sqlite.org _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
