[Kde-pim] Review Request 119933: Optimize: Share set of \SEEN flag across items.

[Kevin Krammer]

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akonadi/protocolhelper.cpp
<https://git.reviewboard.kde.org/r/119933/#comment45606>

    just checking: this is still fine if multiple threads execute it simultantiously?


- Kevin Krammer


On Aug. 25, 2014, 6:29 nachm., Milian Wolff wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/119933/
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> (Updated Aug. 25, 2014, 6:29 nachm.)
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> 
> Review request for KDEPIM-Libraries.
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> Repository: kdepimlibs
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> Description
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> Most items just have a single \SEEN flag in their list of flags.
> Currently, we share the \SEEN flag, but not the list itself. By
> special-casing this extremely often occurring case, we can decrease
> the memory consumption easily. In my case it's a difference of ca.
> 7MB (171MB before vs. 164MB after).
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> 
> Diffs
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>   akonadi/protocolhelper.cpp 3d496667fa622cac2dda7d5a0ca4c92b5a59d2fe 
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> Diff: https://git.reviewboard.kde.org/r/119933/diff/
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> Testing
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> ran it before and after this patch and compared the memory consumption. That went down noticeably. Also added a static counter to compare cache hits/misses temporarily, which showed this cache is easily hit ca. 40k times and only missed 4k times (so a 10:1 ratio, not bad at all :))
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> Thanks,
> 
> Milian Wolff
> 
>

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