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List: kde-panel-devel
Subject: Re: Review Request 108992: Simple optimizations in SignalPlotter
From: "Raul Fernandes" <rgfernandes () gmail ! com>
Date: 2013-02-19 13:47:37
Message-ID: 20130219134737.25498.39409 () vidsolbach ! de
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> On Feb. 18, 2013, 1:39 a.m., Aleix Pol Gonzalez wrote:
> > I don't see loosening the variables' scope as a codebase improvement. Mostly \
> > otherwise.
> > Also I'd like to know how you measured this 5% of improvement, which either way \
> > I'm unsure if it's worth it considering that this patch makes everything global, \
> > now.
I think it is the worst response that I can have.
Never in my entire life I saw anyone that complains about creating classes outside \
loops looses the scope because it is one of the most basic forms of optimizing the \
code. Creating classes inside loops is a great waste of resources. That why KDE4 is \
still bloat and slow. Is is so true that KDE3 is still alive.
I think some developers should learn how to write better and fast code and avoid some \
commentaries like this or "This is only one more full update. Who cares??" (I saw \
this insanity in some place in KDE's code). This patch is one of those that I should \
not put in review because it is so basic, but I do because I don't want to commit \
anything without approval.
- Raul
-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/108992/#review27607
-----------------------------------------------------------
On Feb. 17, 2013, 12:57 p.m., Raul Fernandes wrote:
>
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/108992/
> -----------------------------------------------------------
>
> (Updated Feb. 17, 2013, 12:57 p.m.)
>
>
> Review request for Plasma.
>
>
> Description
> -------
>
> - create variables and classes outside the loops
> - reserve space in QList if we know already how many items will be added (avoid \
> unnecessary reallocations)
> - use const_iterator when possible
> - remove a useless call (p->setPen(Qt::NoPen) - it will be set latter before be \
> used)
> - avoid multiplications (x3, x2, x1 and x0)
>
>
> Diffs
> -----
>
> plasma/widgets/signalplotter.cpp 8e9e294
>
> Diff: http://git.reviewboard.kde.org/r/108992/diff/
>
>
> Testing
> -------
>
> I have tested with KDE 4.10 with no problems.
> I have seen a improvement of about 5% in drawPlots() function, the most expensive \
> function in painting.
>
> Thanks,
>
> Raul Fernandes
>
>
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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/108992/">http://git.reviewboard.kde.org/r/108992/</a>
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<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: \
10px;"> <p style="margin-top: 0;">On February 18th, 2013, 1:39 a.m. UTC, <b>Aleix \
Pol Gonzalez</b> wrote:</p> <blockquote style="margin-left: 1em; border-left: 2px \
solid #d0d0d0; padding-left: 10px;"> <pre style="white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">I don't see loosening the variables' scope as a codebase \
improvement. Mostly otherwise.
Also I'd like to know how you measured this 5% of improvement, which either way \
I'm unsure if it's worth it considering that this patch makes everything \
global, now.</pre> </blockquote>
</blockquote>
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: \
-pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I think it is the worst \
response that I can have. Never in my entire life I saw anyone that complains about \
creating classes outside loops looses the scope because it is one of the most basic \
forms of optimizing the code. Creating classes inside loops is a great waste of \
resources. That why KDE4 is still bloat and slow.
Is is so true that KDE3 is still alive.
I think some developers should learn how to write better and fast code and avoid some \
commentaries like this or "This is only one more full update. Who cares??" \
(I saw this insanity in some place in KDE's code). This patch is one of those \
that I should not put in review because it is so basic, but I do because I don't \
want to commit anything without approval.</pre> <br />
<p>- Raul</p>
<br />
<p>On February 17th, 2013, 12:57 p.m. UTC, Raul Fernandes wrote:</p>
<table bgcolor="#fefadf" width="100%" cellspacing="0" cellpadding="8" \
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url('http://git.reviewboard.kde.org/static/rb/images/review_request_box_top_bg.ab6f3b1072c9.png'); \
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<div>Review request for Plasma.</div>
<div>By Raul Fernandes.</div>
<p style="color: grey;"><i>Updated Feb. 17, 2013, 12:57 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" \
style="border: 1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">- create variables and classes outside the loops
- reserve space in QList if we know already how many items will be added (avoid \
unnecessary reallocations)
- use const_iterator when possible
- remove a useless call (p->setPen(Qt::NoPen) - it will be set latter before be \
used)
- avoid multiplications (x3, x2, x1 and x0)</pre>
</td>
</tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
<table width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="10" style="border: \
1px solid #b8b5a0"> <tr>
<td>
<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: \
-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: \
break-word;">I have tested with KDE 4.10 with no problems. I have seen a improvement \
of about 5% in drawPlots() function, the most expensive function in painting.</pre> \
</td> </tr>
</table>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>plasma/widgets/signalplotter.cpp <span style="color: grey">(8e9e294)</span></li>
</ul>
<p><a href="http://git.reviewboard.kde.org/r/108992/diff/" style="margin-left: \
3em;">View Diff</a></p>
</td>
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