Review Request 129859: Add benchmark for KTextToHTML::convertToHtml

[Milian Wolff]

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This is an automatically generated e-mail. To reply, visit:
https://git.reviewboard.kde.org/r/129859/
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Review request for KDE Frameworks, David Faure, Daniel Vrátil, and Laurent Montel.


Repository: kcoreaddons


Description
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On my machine, the initial output is as follows for RelWithDebInfo:

PASS   : KTextToHTMLTest::benchHtmlConvert(plain)
RESULT : KTextToHTMLTest::benchHtmlConvert():"plain":
     4.0 msecs per iteration (total: 65, iterations: 16)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces":
     3.4 msecs per iteration (total: 55, iterations: 16)
PASS   : KTextToHTMLTest::benchHtmlConvert(highlight-text)
RESULT : KTextToHTMLTest::benchHtmlConvert():"highlight-text":
     4.2 msecs per iteration (total: 68, iterations: 16)
PASS   : KTextToHTMLTest::benchHtmlConvert(replace-smileys)
RESULT : KTextToHTMLTest::benchHtmlConvert():"replace-smileys":
     4.1 msecs per iteration (total: 66, iterations: 16)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces+highlight-text)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces+highlight-text":
     3.6 msecs per iteration (total: 58, iterations: 16)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces+highlight-text+replace-smileys)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces+highlight-text+replace-smileys":
     3.5 msecs per iteration (total: 57, iterations: 16)

Replace heap-allocated list of chars with QStringLiteral

The main bottleneck in the benchmark for KTextToHTML was actually
constructing the temporary list of word-boundaries. Instead of
doing that all the time, use a QStringLiteral-constructed static
QString.

This improves the benchmarks by more than ~4x on my machine,
all compiled in RelWithDebInfo:

PASS   : KTextToHTMLTest::benchHtmlConvert(plain)
RESULT : KTextToHTMLTest::benchHtmlConvert():"plain":
     0.75 msecs per iteration (total: 96, iterations: 128)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces":
     0.71 msecs per iteration (total: 91, iterations: 128)
PASS   : KTextToHTMLTest::benchHtmlConvert(highlight-text)
RESULT : KTextToHTMLTest::benchHtmlConvert():"highlight-text":
     0.89 msecs per iteration (total: 57, iterations: 64)
PASS   : KTextToHTMLTest::benchHtmlConvert(replace-smileys)
RESULT : KTextToHTMLTest::benchHtmlConvert():"replace-smileys":
     0.75 msecs per iteration (total: 96, iterations: 128)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces+highlight-text)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces+highlight-text":
     0.79 msecs per iteration (total: 51, iterations: 64)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces+highlight-text+replace-smileys)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces+highlight-text+replace-smileys":
     0.79 msecs per iteration (total: 51, iterations: 64)

Remove temporary string allocations

Instead of calling .mid() to compare to a QLatin1String,
call .midRef() as that won't allocate.

Improves the performance of the unit test by ~2x on my
machine when compiling in RelWithDebInfo:

PASS   : KTextToHTMLTest::benchHtmlConvert(plain)
RESULT : KTextToHTMLTest::benchHtmlConvert():"plain":
     0.40 msecs per iteration (total: 52, iterations: 128)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces":
     0.36 msecs per iteration (total: 93, iterations: 256)
PASS   : KTextToHTMLTest::benchHtmlConvert(highlight-text)
RESULT : KTextToHTMLTest::benchHtmlConvert():"highlight-text":
     0.51 msecs per iteration (total: 66, iterations: 128)
PASS   : KTextToHTMLTest::benchHtmlConvert(replace-smileys)
RESULT : KTextToHTMLTest::benchHtmlConvert():"replace-smileys":
     0.41 msecs per iteration (total: 53, iterations: 128)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces+highlight-text)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces+highlight-text":
     0.44 msecs per iteration (total: 57, iterations: 128)
PASS   : KTextToHTMLTest::benchHtmlConvert(preserve-spaces+highlight-text+replace-smileys)
RESULT : KTextToHTMLTest::benchHtmlConvert():"preserve-spaces+highlight-text+replace-smileys":
     0.46 msecs per iteration (total: 59, iterations: 128)

Mark some methods as const


Diffs
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  autotests/ktexttohtmltest.h 3aaa5810d84ecb05b68b8a20b94bd281cfe3a6ba 
  autotests/ktexttohtmltest.cpp fa8bbf261acd7b77ac502f14ca7820d3aeed7b55 
  src/lib/text/ktexttohtml.cpp 9b15cb27c7b9998971e2efbc198c3f840bf34959 
  src/lib/text/ktexttohtml_p.h 5e343485b26eb03ce2805f3a9f178a395f9b46a3 

Diff: https://git.reviewboard.kde.org/r/129859/diff/


Testing
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the test still passes fine. note that the above is actually split into 4 commits locally


Thanks,

Milian Wolff

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