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45 Thu, 26 May 2011 14:47:45 -0700 (PDT)
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46 Subject: Re: one-time-iterators
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47 From: Patrick Totzke <patricktotzke@googlemail.com>
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48 To: Austin Clements <amdragon@mit.edu>
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49 In-reply-to: <BANLkTi=3mQYJft4s9jGaoqSbcJvqhmZXyQ@mail.gmail.com>
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50 References: <1306397849-sup-3304@brick> <877h9d9y5m.fsf@yoom.home.cworth.org>
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51 <BANLkTi=3mQYJft4s9jGaoqSbcJvqhmZXyQ@mail.gmail.com>
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52 Date: Thu, 26 May 2011 22:47:42 +0100
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79 hehe, did it again (dropping the list from cc). I need to stop
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80 using sup :P thanks Austin.
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82 Excerpts from Carl Worth's message of Thu May 26 18:20:21 +0100 2011:
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83 > On Thu, 26 May 2011 09:31:19 +0100, Patrick Totzke <patricktotzke@googl=
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85 > > Wow. This reads really complicated. All I want to say is:
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86 > > if I change tags in my search-results view, I get Xapian errors :)
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89 > Yes, that's frustrating. I wish that we had a more reliable interface a=
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91 > the notmuch library level. But I'm not entirely sure what would be the
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92 > best way to do this.
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93 Actually, I expected something like this. For this reason each sup instan=
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97 At the moment I'm going for custom wrapper classes around notmuch.Thread
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98 and notmuch.Messages that cache the result of the calls relevant for me.
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99 But the real issue seems to be the iterator:
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100 It takes an awful lot of time just to copy the thread ids of all threads =
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103 large a query result.
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105 I tried the following in ipython:
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106 q=3DDatabase().create_query('*')
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107 time tids =3D [t.get_thread_id() for t in q.search_threads()]
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110 CPU times: user 7.64 s, sys: 2.06 s, total: 9.70 s
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113 It would really help if the Query object could return an iterator
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114 of thread-ids that makes this copying unnecessary. Is it possible to
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115 implement this? Or would this require the same amount of copying to happe=
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118 I have not looked into the code for the bindings or the C code so far,
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119 but I guess the Query.search_threads() translates to some =
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121 "SELECT id,morestuff from threads"
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122 where for me a "SELECT is from threads" would totally suffice. Copying =
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124 (in the C code) only the ids so some list that yields an iterator should =
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127 > > The question: How do you solve this in the emacs code?
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128 > > do you store all tids of a query? =
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132 > The emacs code does not use the notmuch library interface like your
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133 > python bindings do. Instead, it uses the notmuch command-line tool, (an=
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135 > buffers up the text output by it). =
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137 Ahh ok. Thanks for the explanation.
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139 Excerpts from Austin Clements's message of Thu May 26 21:18:53 +0100 2011=
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141 > I proposed a solution to this problem a while ago
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142 > (id:"AANLkTi=3DKOx8aTJipkiArFVjEHE6zt_JypoASMiiAWBZ6@mail.gmail.com"),
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143 > though I haven't tried implementing it yet.
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144 Sorry, I wasn't on the list back then.
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146 > Though, Patrick, that solution doesn't address your problem.=C2=A0 On t=
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148 > other hand, it's not clear to me what concurrent access semantics
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149 > you're actually expecting.=C2=A0 I suspect you don't want the remaining=
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151 > iteration to reflect the changes, since your changes could equally
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152 > well have affected earlier iteration results.=C2=A0
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155 > But if you want a
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156 > consistent view of your query results, something's going to have to
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157 > materialize that iterator, and it might as well be you (or Xapian
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158 > would need more sophisticated concurrency control than it has).=C2=A0 B=
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160 > this shouldn't be expensive because all you need to materialize are
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161 > the document ids; you shouldn't need to eagerly fetch the per-thread
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164 I thought so, but it seems that Query.search_threads() already
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165 caches more than the id of each item. Which is as expected
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166 because it is designed to return thread objects, not their ids.
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167 As you can see above, this _is_ too expensive for me.
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169 > Have you tried simply calling list() on your thread
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170 > iterator to see how expensive it is? My bet is that it's quite cheap,
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171 > both memory-wise and CPU-wise.
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173 q=3DDatabase().create_query('*')
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174 time tlist =3D list(q.search_threads())
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175 raises a NotmuchError(STATUS.NOT_INITIALIZED) exception. For some reason
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176 the list constructor must read mere than once from the iterator.
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177 So this is not an option, but even if it worked, it would show
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178 the same behaviour as my above test..
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180 would it be very hard to implement a Query.search_thread_ids() ?
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181 This name is a bit off because it had to be done on a lower level.
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