Hi guys,
I have one question to you. Why new syntax of QObject::connect() improve
performance for a 5%.
I mean that if in code change
connect( sender, SIGNAL( signal() ), receiver, SLOT( slot() ) );
to
connect( sender, &Sender::signal, receiver, &Receiver::slot );
then code works faster... Why? May be somebody know the answer, I don’t want to
read Qt’s code for the answer on this question.
Thanks.
From: igor.mironc...@gmail.com
Sent: Monday, June 09, 2014 8:08 AM
To: interest@qt-project.org
Subject: Re: How to speed-up chameleons
Sorry guys, but in the code was error.
But this error did not affect the performance.
In the attachment code without error...
From: igor.mironc...@gmail.com
Sent: Monday, June 09, 2014 3:40 AM
To: interest@qt-project.org
Subject: How to speed-up chameleons
Hi. I did a comparison of Qt with another framework (SObjectizer). For this I
used a task named “Chameleons”:
* Need to create four competitive (in the sense of each lives in its own
thread) chameleons of different colors (blue, red, yellow, blue);
* Each chameleon should regularly come to the venue and meet there with another
chameleon. If a place of meeting, there is no one who comes first chameleon
should wait a second;
* At the meeting should be appropriately chameleons change their color. When
calculating the new color chameleon can not use arithmetic - only if / else,
switch / case or pattern-matching;
* After the on-site meeting formed N pairs, each chameleon should "dry up" (get
a special color FADED), report the number of chameleons met them personally and
to complete its work.
As a result of the work program should print the amount reported by each
chameleon meetings. For example, for N = 100 the result of the program should
be 200.
The result is terrible. Qt is 10 times slower.
In the attachment you can find my implementation of this task on Qt.
And my question is how to speed-up it?
Thanks.
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