On 1/13/17, Kim Gräsman <kim.gras...@gmail.com> wrote: > > In an effort to reduce memory usage/fragmentation, we're trying to > configure SQLite to allocate as much memory as necessary up-front > (based on the excellent information in > https://www.sqlite.org/malloc.html). >
The easiest way to do this is to compile with SQLITE_ENABLE_MEMSYS5 then give SQLite 10 or 20MB of memory to use at start-time by invoking sqlite3_config(SQLITE_CONFIG_HEAP, malloc(10000000), 10000000, 64); or similar. The page-cache and scratch memory will both be automatically served from this pool if you take no further actions, and this usually works just fine. Use sqlite3_memory_highwater(0) to see how close you are getting to memory exhaustion so that you can judge if 10MB is too little or too much and make appropriate changes. Note that you cannot increase or decrease the amount of memory available to memsys5 at runtime, except by completely closing all SQLite database connections and interfaces, running sqlite3_shutdown() and then redoing the sqlite3_config() call above with the new memory size. -- 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
