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

[Milian Wolff]

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https://git.reviewboard.kde.org/r/119933/
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Review request for KDEPIM-Libraries.


Repository: kdepimlibs


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).


Diffs
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  akonadi/protocolhelper.cpp 3d496667fa622cac2dda7d5a0ca4c92b5a59d2fe 

Diff: https://git.reviewboard.kde.org/r/119933/diff/


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 :))


Thanks,

Milian Wolff

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