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24 Fri, 08 Apr 2016 00:40:59 -0000
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25 From: David Bremner <david@tethera.net>
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26 To: notmuch@notmuchmail.org, xapian-discuss@lists.xapian.org
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27 Subject: Re: slowdown in notmuch perf suite with xapian 1.3.5
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28 In-Reply-To: <20160407232537.GB29434@survex.com>
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29 References: <87twjd639d.fsf@zancas.localnet>
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30 <20160407232537.GB29434@survex.com>
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31 User-Agent: Notmuch/0.21+99~gd93d377 (http://notmuchmail.org) Emacs/24.5.1
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32 (x86_64-pc-linux-gnu)
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33 Date: Thu, 07 Apr 2016 21:40:59 -0300
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51 Olly Betts <olly@survex.com> writes:
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54 > So the T00-new.sh numbers make sense - there's more work to do, and
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55 > we need to read existing positional data more to insert the new stuff,
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56 > so the increased reads and writes make sense.
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58 > But guessing at what the other two tests do, I wouldn't expect them to
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59 > be affected by this.
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61 The non-optimized-away cases of T02-tag just adding and deleting terms
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62 to each document with term Tmail
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64 > I'm also a bit puzzled by how glass can manage not to read any data
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65 > for "dump *", and several tests seem to not read or write anything
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66 > for either backend. What exactly are the "In/Out" numbers?
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68 that's just the output from /usr/bin/time -f '%e\t%U\t%S\t%M\t%I/%O'
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70 The manual describes them as "number of file system
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71 inputs/outputs". From looking at the source, they correspond to
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72 ru_inblock and ru_oublock fields from the getrusage call. AFAIU, that
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73 means the number of non-cached read/writes.
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