Re: [notmuch] Notmuch performance problems on OSX

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+From: Stewart Smith <stewart@flamingspork.com>\r
+To: Olly Betts <olly@survex.com>, notmuch@notmuchmail.org\r
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+Date: Tue, 16 Feb 2010 14:53:26 +1100\r
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+Subject: Re: [notmuch] Notmuch performance problems on OSX\r
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+\r
+On Fri, 15 Jan 2010 03:58:50 +0000 (UTC), Olly Betts <olly@survex.com> wrote:\r
+> One difference between OS X and other systems is that OS X supports the\r
+> F_FULLSYNC ioctl, and other systems don't (currently, at least AFAIK)\r
+> and Xapian uses that if it is available to ensure that changes have\r
+> actually made it to disk:\r
+> \r
+> http://trac.xapian.org/ticket/288\r
+> \r
+> On other systems, it uses fdatasync() or fsync(), which typically just\r
+> ensure that the data has left the OS - it can sit in disk controller or\r
+> drive caches for potentially seconds longer.  This call happens once\r
+> per table for every (explicit or implicit) flush on a database.\r
+\r
+At least if you OS and file system don't hate you (e.g. XFS on Linux),\r
+then fsync() really does flush the drive cache.\r
+\r
+Also keep in mind that the OSX file system (HFS+) was great for\r
+1985. It's essentially single threaded :/\r
+\r
+-- \r
+Stewart Smith\r