Yes, [mmap] can be larger than physical memory. And what do you think about the new mapping way I mentioned ?
原始邮件 发件人:Stephan bealsgb...@googlemail.com 收件人:SQLite mailing listsqlite-us...@mailinglists.sqlite.org 发送时间:2016年8月31日(周三) 16:53 主题:Re: [sqlite] Why MMAP return ENOMEM in SQLite? On Wed, Aug 31, 2016 at 10:43 AM, Stephan Beal sgb...@googlemail.com wrote: On Wed, Aug 31, 2016 at 10:39 AM, sanhua.zh sanhua...@foxmail.com wrote: In my testcase, I can only [mmap] a db file at most 1.4GB size. But in this new way, I can map a file at most 3.2GB. The test device is iPhone 6S. According to google, the iPhone 6s only has 2GB of RAM, so you can't memmap 3.2G. Correction: you can map larger than physical memory, up to limits set by the OS environment. In your case, see: http://stackoverflow.com/questions/9184773/is-there-a-practical-limit-on-the-number-of-memory-mapped-files-in-ios In any case, as Simone said, _other apps_ require memory of their own as well. Correction 2: Simon, not Simone (my roommate's name, so i type the 'e' out of habit) -- ----- stephan beal http://wanderinghorse.net/home/stephan/ "Freedom is sloppy. But since tyranny's the only guaranteed byproduct of those who insist on a perfect world, freedom will have to do." -- Bigby Wolf _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
