Hi there
Re: QScriptEngine vs. QJSEngine?
<https://forum.qt.io/topic/23077/qscriptengine-vs-qjsengine>
I was given a task to compare performance scripting solutions in Qt and
to my surprise QScriptEngine was the absolute winner of the contest,
especially with the ability of keeping pre-parsed script in QScriptProgram.
The evaluation of 30.000 expressions was 3-6 *times* better on first
evaluation round, 6-30 times on the repeated evaluation (depending on
formulae complexity reaching from simple calculation "100 + (5/1.23)" to
more complicated 2 line expressions with some variable bindings).
I was truly astonished that QJSEngine performed that miserably at simple
calculations as it is the engine powering QML. Maybe
QJSEngine-QQmlEngine is optimized toward property notifications/changes,
maybe this performance gap is the reason why QtScript was not yet been
phased out.
Maybe I am completely wrong in general. Anyone else experienced this?
Thank you for your insights!
Code involved is
hg clone https://ko...@bitbucket.org/kovis/qtscripting
hg clone https://ko...@bitbucket.org/kovis/qtscripting
hg up
501e8c4264cd124fd1ec6b82670d6f947c9c2859<https://bitbucket.org/kovis/qtscripting/commits/501e8c4264cd124fd1ec6b82670d6f947c9c2859?at=default>
or here in
https://bitbucket.org/kovis/qtscripting/commits/501e8c4264cd124fd1ec6b82670d6f947c9c2859?at=default
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