Re: github mirror

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+Return-Path:\r
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+From: David Mazieres <dm-list-email-notmuch@scs.stanford.edu>\r
+To: Sam Halliday <sam.halliday@gmail.com>, notmuch@notmuchmail.org\r
+Subject: Re: github mirror\r
+In-Reply-To: <87bnvn111h.fsf@Samskara.home>\r
+References: <87bnvn111h.fsf@Samskara.home>\r
+Date: Sun, 27 Apr 2014 12:04:45 -0700\r
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+\r
+Sam Halliday <sam.halliday@gmail.com> writes:\r
+\r
+> Dear NotMuch,\r
+>\r
+> But in any case, my RFE/question was this: how hard would it be to have\r
+> an optional mode of behaviour where tags are stored in the message\r
+> itself, so that syncing with an IMAP server (e.g. via offlineimap)\r
+> would make the tags available on all devices. This would negate the need\r
+> for workarounds, such as shared notmuch databases, when users have\r
+> multiple machines.\r
+\r
+The problem is that different imap servers store tags in different\r
+ways.  Since notmuch does not use imap, it would be hard for notmuch to\r
+synchronize the tags, other than the standard ones (for which notmuch\r
+already has support).\r
+\r
+One thing you could do is build an external tool that synchronizes\r
+notmuch tags and spawns an imap server in preauth mode to sync the tags.\r
+(That would be yet another use for the ctime values we have discussed on\r
+this list.)\r
+\r
+> It would also allow applications like offlineimap to introduce a gmail\r
+> plugin that would copy the message into a folder according to its tags,\r
+> so gmail labels and notmuch tags would be in sync.\r
+\r
+Unfortunately, offlineimap is dog slow, especially when you have a ton\r
+of maildirs.  It just doesn't seem to pipeline very well at all.  Even\r
+when I run 5 or 10 threads, it still seems to take a whole bunch of\r
+round trip times.\r
+\r
+I used to want what you want.  But then it got to the point that\r
+offlineimap was taking 30 seconds to sync my 60 maildirs over 3G, even\r
+when there was no new mail.  Worse, one thread seems to busy-wait for\r
+the others to finish, so it often pegs the CPU and drains the battery on\r
+my laptop.\r
+\r
+As a result, I built a tool that synchronizes notmuch tags directly.\r
+Now my problem is waiting for "notmuch new" to run, but at least the\r
+synchronization part is really fast and pleasant.  I'll be releasing my\r
+tool in the next couple of months once I've kicked the tires a bit more\r
+and fixed up a few things.\r
+\r
+David\r