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29 Tue, 15 Nov 2011 08:46:07 -0800 (PST)
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30 From: Pieter Praet <pieter@praet.org>
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31 To: Austin Clements <amdragon@MIT.EDU>
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32 Subject: Re: [PATCH] emacs: Use a single buffer invisibility spec to fix
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33 quadratic search cost.
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34 In-Reply-To: <20111111045341.GS2658@mit.edu>
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35 References: <1320807328-13728-1-git-send-email-amdragon@mit.edu>
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36 <877h382jax.fsf@SSpaeth.de>
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37 <CAPFwwQgsqe2NE9vm2RJHHK+8hWR_uMWKLHcxm0xkjduFboAfPw@mail.gmail.com>
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38 <87d3czxsu9.fsf@praet.org> <20111111045341.GS2658@mit.edu>
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39 User-Agent: Notmuch/0.9+76~g2fd88e6 (http://notmuchmail.org) Emacs/23.3.1
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40 (x86_64-unknown-linux-gnu)
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41 Date: Tue, 15 Nov 2011 17:45:10 +0100
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46 Cc: notmuch@notmuchmail.org, servilio <servilio@gmail.com>
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61 On Thu, 10 Nov 2011 23:53:41 -0500, Austin Clements <amdragon@MIT.EDU> wrot=
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63 > Quoth Pieter Praet on Nov 11 at 4:04 am:
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64 > > On Thu, 10 Nov 2011 14:22:30 -0500, servilio <servilio@gmail.com> wrote:
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65 > > > On 10 November 2011 08:33, Sebastian Spaeth <Sebastian@sspaeth.de> wr=
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67 > > > > On Tue, =C2=A08 Nov 2011 21:55:28 -0500, Austin Clements <amdragon@=
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69 > > > >> =C2=A0emacs/notmuch.el | =C2=A0 11 +++--------
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70 > > > >> =C2=A01 files changed, 3 insertions(+), 8 deletions(-)
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73 > > > > Tested and works great here! +1 for quick inclusion.
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75 > > > I join the petition, I have been using for a couple of days and the
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76 > > > difference is noticeable.
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79 > > Subjectively, I'm not seeing any difference, but that may be due to a
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80 > > relatively recent machine, and Austin's recent rebase [1] of Istvan's
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81 > > database patch [2] no doubt makes a huge difference as well.
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83 > How many results? Since it's eliminating a quadratic factor, this
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84 > only affects large search result buffers (and only once they grow
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85 > large; the beginning of the buffer will come in just as quickly with
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89 About the same as with my review [1] of the database patch [2], so ~9540.
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91 > > I've tried getting some hard numbers using
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94 > > time emacs --eval '(progn
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96 > > (notmuch-search "*")
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97 > > (while (get-buffer-process (current-buffer))
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98 > > (sleep-for 0.1))
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102 > > ... but the results vary wildly on subsequent runs.
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104 > For me, this doesn't actually display the results buffer (though I
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105 > don't know why not), which means it won't test this, since the problem
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106 > lies in the Emacs redisplay logic. However, I think it does yield a
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107 > baseline of how long it takes to construct the buffer without
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108 > displaying it. This is interesting because, while this patch does not
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109 > achieve this baseline time, this patch combined with another one I
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110 > have waiting in the wings, does.
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113 That's it! I've been running the test unattended, so I failed to notice
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114 that the results buffer isn't always displayed (i.e. sometimes it is,
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115 causing the test to take quite a bit longer).
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117 > > How would one go about getting stable results?
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119 > The results are quite stable for me, both timing it manually and using
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120 > the command you gave above. The only non-obvious thing that comes to
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121 > mind is that you're probably testing on multiple cores, in which case
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122 > the kernel scheduler could introduce a lot of noise. You could try
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123 > running numactl -C 0 emacs ... to see if there's any merit to this
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126 Hmm, numactl isn't available on my system;
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128 I seem to have only a single node @ '/sys/devices/system/node/', and
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129 both cpu0 and cpu1 @ '/sys/devices/system/cpu/' contain a symlink to
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132 I'm guessing my kernel lacks support for NUMA policy?
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134 Either way, this works:
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135 echo 0 > /sys/devices/system/cpu/cpu1/online
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143 [1] id:"87obwjtpcd.fsf@praet.org"
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144 [2] id:"1320599856-24078-1-git-send-email-amdragon@mit.edu"
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