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31 To: notmuch@notmuchmail.org
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32 From: Olly Betts <olly@survex.com>
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33 Date: Tue, 9 Feb 2010 22:09:31 +0000 (UTC)
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44 Subject: Re: [notmuch] Notmuch performance problems on OSX
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59 On 2010-02-09, Oliver Charles wrote:
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60 > I just upgraded to xapian-core HEAD and notmuch master tip today, in
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61 > desparation to get away from GMail. Sadly it's still taking at least
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62 > 0.7s to tag a single thread (with one message). I'm really eager to
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63 > solve this, could anyone give me any pointers on how I could go about
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64 > profiling it or finding the cause of this problem?
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66 The first thing to try is disabling use of F_FULLFSYNC. You'll need to
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67 run this command in the xapian-core source tree to comment out the F_FULLFSYNC
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70 perl -pi -e 's/^#ifdef F_FULLFSYNC/#if 0/' backends/*/*_io.h
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72 Then run "make" and "make install".
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74 This makes you a bit more vulnerable to power failures, but no worse than
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75 a typical Unix system. There's some background here:
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77 http://lists.apple.com/archives/Darwin-dev/2005/Feb/msg00072.html
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79 Assuming that helps, then (a) you have a workaround, and (b) we'll know for
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80 sure it is F_FULLFSYNC to blame.
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82 I've created a ticket for a change to Xapian which should help here, but
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83 not had a chance to work on it yet:
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85 http://trac.xapian.org/ticket/426
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