Re: please eat my data!

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+From: Jameson Rollins <jrollins@finestructure.net>\r
+To: Sebastian Spaeth <Sebastian@SSpaeth.de>, Notmuch list\r
+       <notmuch@notmuchmail.org>\r
+Subject: Re: please eat my data!\r
+In-Reply-To: <87633wlrrk.fsf@SSpaeth.de>\r
+References: <87633wlrrk.fsf@SSpaeth.de>\r
+Date: Mon, 12 Apr 2010 10:21:35 -0400\r
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+\r
+--=-=-=\r
+\r
+On Mon, 12 Apr 2010 15:33:35 +0200, "Sebastian Spaeth" <Sebastian@SSpaeth.de> wrote:\r
+> fsync is really killing xapian (and notmuch). What suffers, are the\r
+> boolean prefixes (tag, id, and thread). Using libeatmydata (which\r
+> disables fsync) shows a 10x speedup for tagging. The speedup is only\r
+> factor 2 for e.g. from: searches. This is ext4 on recent stock\r
+> Ubuntu. Given that search by tag and thread are performed really often\r
+> (each time I advance a thread, for example), that really hurts.\r
+\r
+Wow, this is really interesting, Sebastian.  For those of us not in the\r
+know, can you explain what libeatmydata is and how it's used?  It sounds\r
+like something I would *not* want to use!  So you didn't have to\r
+recompile here, and only had to set LD_PRELOAD=./libeatmydata.so?  Is\r
+there any drawback to what you're doing here?\r
+\r
+jamie.\r
+\r
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