On 31 Aug 2016, at 4:40am, sanhua.zh <sanhua...@foxmail.com> wrote: > Is it caused by mmap file too big that the address space is not enough?
Yes. Under iOS, memory maps can only be as big as the available physical memory. You're working on a tiny multi-tasking device and memory is at a premium. You can't afford to hog memory. Nor can you do data-handling so fast that it runs down the battery or overheats the device. Also, iDevices before the iPhone 5S in 2013 ran a 32-bit version of iOS, limiting them to 4GB of memory per App. > If yes, then how can I get the allowed mmap file size? This figure would be useless since available physical memory varies depending on things your application cannot prevent. For instance, you may find out how much free memory there is, but then there may be in incoming phonecall. iOS will then allocate some of that memory to the process dealing with the phonecall. And, of course you cannot do anything to interfere with a phonecall because that is more important than an App. Why are you trying to do memory-mapping on a portable device ? Is it for speed ? Do you absolutely need it ? Won't the standard SQLite API do the job well enough ? Simon. _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
