On May 17, 2015, at 5:57 PM, Thomas Munro <thomas.mu...@enterprisedb.com> wrote: >> On Sun, May 17, 2015 at 2:15 PM, Robert Haas <robertmh...@gmail.com> wrote: >> http://oldblog.antirez.com/post/fsync-different-thread-useless.html >> >> It suggests that an fsync in progress blocks out not only other >> fsyncs, but other writes to the same file, which for our purposes is >> just awful. More Googling around reveals that this is apparently >> well-known to Linux kernel developers and that they don't seem excited >> about fixing it. :-( > > He doesn't say, but I wonder if that is really Linux, or if it is the > ext2, 3 and maybe 4 filesystems specifically. This blog post talks > about the per-inode mutex that is held while writing with direct IO.
Good point. We should probably test ext4 and xfs on a newish kernel. ...Robert -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
