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+Date: Mon, 9 Jul 2012 12:30:00 -0400\r
+From: Austin Clements <amdragon@MIT.EDU>\r
+To: Sebastien Binet <binet@cern.ch>\r
+Subject: Re: query on a subset of messages ?\r
+Message-ID: <20120709163000.GG18195@mit.edu>\r
+References: <871ukl5oj7.fsf@cern.ch>\r
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+\r
+Quoth Sebastien Binet on Jul 09 at 10:25 am:\r
+> \r
+> hi there,\r
+> \r
+> I was trying to reduce the I/O stress during my usual email\r
+> fetching+tagging by writing a little program using the go bindings to\r
+> notmuch.\r
+> \r
+> ie:\r
+> db, status := notmuch.OpenDatabase(db_path,\r
+> notmuch.DATABASE_MODE_READ_WRITE)\r
+> query := db.CreateQuery("(tag:new AND tag:inbox)")\r
+> msgs := query.SearchMessages()\r
+> for _,msg := range msgs {\r
+> tag_msg(msg, tagqueries)\r
+> }\r
+> \r
+> \r
+> where tagqueries is a subquery of the form:\r
+> [\r
+> {\r
+> "Cmd": "+to-me",\r
+> "Query": "(to:sebastien.binet@cern.ch and not tag:to-me)"\r
+> },\r
+> {\r
+> "Cmd": "+sci-notmuch",\r
+> "Query": "from:notmuch@notmuchmail.org or to:notmuch@notmuchmail.org or subject:notmuch"\r
+> }\r
+> ]\r
+> \r
+> \r
+> the idea being that I only need to crawl through the db only once and\r
+> then iteratively apply tags on those messages (instead of repeatedly\r
+> running "notmuch tag ..." for each and every of those many\r
+> 'tag-queries')\r
+> \r
+> I couldn't find any C-API to do such a thing using the notmuch library.\r
+> did I overlook something ?\r
+> \r
+> Is it something useful to add ?\r
+> \r
+> -s\r
+\r
+Have you tried a more direct translation of the multiple notmuch tag\r
+commands into Go, where you don't worry about subsetting the queries?\r
+Unless you're tagging a huge number of messages, the cost of notmuch\r
+tag is almost certainly the fsync that it does when it closes the\r
+database (which every call to notmuch tag must do). However, in Go,\r
+you can keep the database open across all of the tagging operations\r
+and then close and fsync it just once.\r
+\r
+Note that there is an important optimization in notmuch tag that you\r
+might have to replicate. It manipulates the original query to exclude\r
+messages that already have the desired tags, so that they get skipped\r
+very efficiently at the earliest stage possible.\r
projects / notmuch-archives.git / commitdiff