Re: slowdown in notmuch perf suite with xapian 1.3.5

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org, xapian-discuss@lists.xapian.org\r
+Subject: Re: slowdown in notmuch perf suite with xapian 1.3.5\r
+In-Reply-To: <20160407232537.GB29434@survex.com>\r
+References: <87twjd639d.fsf@zancas.localnet>\r
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+\r
+Olly Betts <olly@survex.com> writes:\r
+\r
+>\r
+> So the T00-new.sh numbers make sense - there's more work to do, and\r
+> we need to read existing positional data more to insert the new stuff,\r
+> so the increased reads and writes make sense.\r
+>\r
+> But guessing at what the other two tests do, I wouldn't expect them to\r
+> be affected by this.\r
+\r
+The non-optimized-away cases of T02-tag just adding and deleting terms\r
+to each document with term Tmail\r
+\r
+> I'm also a bit puzzled by how glass can manage not to read any data\r
+> for "dump *", and several tests seem to not read or write anything\r
+> for either backend.  What exactly are the "In/Out" numbers?\r
+\r
+that's just the output from /usr/bin/time -f '%e\t%U\t%S\t%M\t%I/%O'\r
+\r
+The manual describes them as "number of file system\r
+inputs/outputs". From looking at the source, they correspond to\r
+ru_inblock and ru_oublock fields from the getrusage call. AFAIU, that\r
+means the number of non-cached read/writes.\r
+\r
+d\r
+\r