Hi, On Mon, 26 Nov 2018 at 15:22, Yijie Zhong <yijiezhong12@xxxxxxxxx> wrote: > > I have learned that glibc emulate POSIX AIO via thread pool on Linux > and only one thread would service for one open file > (https://github.com/bminor/glibc/blob/glibc-2.28/sysdeps/pthread/aio_misc.c#L359). > > I want to use fio to validate it, so I want to know how to set up fio > working with multiple files simultaneously? I'm not too sure on this one. You could ask fio to use multiple threads/processes itself via things like numjobs bigger than 1 (and then you could put the iodepth down) and hope round robin sends each I/O to a different file but perhaps this is not what you're after. I suppose the other thing to try is having as many files as your iodepth but the big snag is this I/O is going to start looking more random rather than sequential the more files you use. You might just be hitting a Linux glibc POSIX AIO weakness... -- Sitsofe | http://sucs.org/~sits/
