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31 From: David Bremner <david@tethera.net>
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32 To: Robert Mast <beheerder@tekenbeetziekten.nl>, notmuch@notmuchmail.org
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33 Subject: Re: [PATCH] bitmap:improve memory usage using CHAR_BITS and unsigned
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35 In-Reply-To: <1360769577-4861-1-git-send-email-beheerder@tekenbeetziekten.nl>
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36 References: <1359917491-17178-1-git-send-email-beheerder@tekenbeetziekten.nl>
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37 <1360769577-4861-1-git-send-email-beheerder@tekenbeetziekten.nl>
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39 (x86_64-pc-linux-gnu)
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40 Date: Sat, 16 Feb 2013 07:37:37 -0400
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59 Robert Mast <beheerder@tekenbeetziekten.nl> writes:
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61 > Using char instead of int allows for simpler definitions of the
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62 > DOCIDSET macros so the code is easier to understand and consistent with
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63 > respect to memory-usage. Estimated reduction of memory-usage for
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64 > bitmap about 8 times.
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68 I did a bit of testing, and this yields about a 7% improvement in the
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69 total memory allocated on the medium corpus (running
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70 performance-tests/M00-new) and about a 3% speedup running the large
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71 corpus. These are definitely improvements worth having, but I think I
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72 won't push it to the bug fix release, but rather wait for the next
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