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Hello Fernando,<br>
<br>
thank you for your warm words about KDE and Cantor :-)<br>
<br>
The connection to and the initialization of a backend process takes
some time. The times are different for different backends.<br>
Your observations about the long evaluation times for the first
expression and almost instant evaluation of the subsequent
expressions<br>
is because of the recent improvement that was done in 17.12.
Previously, the initialization was done during the creation of a new
session.<br>
So, when opening a project file the user had to wait until the
initialization is done even in cases where he/she doesn't plan to
modify the worksheet at all.<br>
This was changed. The creation of a new session or opening of saved
project files is much faster now and the initialization of the
backend process is <br>
postponed to the point when the user really asks Cantor to evaluate
something.<br>
<br>
The recommended versions for R and Sage are missing, yes. But those
are minor issues compared to the crashes you have. Let's have a look
at them first.<br>
Which versions of Maxima and Sage are you using? Any chance to
install the debuginfo package for Cantor and to try again? Without
the debug symbols<br>
the crash dumps are not really useful...<br>
<br>
Connection to R is broken, the fix for this is "work in progress" at
the moment.<br>
<br>
Regards,<br>
Alexander<br>
<br>
<br>
<div class="moz-cite-prefix">On 12.01.2018 19:20, Fernando de Morais
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFReGtnTuGj9nUsaq1D89TOTsZsTQYiJhfwve=jbd+AXkDSoAA@mail.gmail.com">
<div dir="ltr">Hello Alexander,
<div><br>
</div>
<div>Thank you for a fast reply. I'll do my best to describe my
problems:</div>
<div><br>
</div>
<div>1 - The first strange behavior that I noticed is Cantor not
showing the recommended version for R and Sage (Pic 1 and 2) :</div>
<div><br>
</div>
<div><img src="cid:part1.05A66041.354101B5@web.de" class=""
width="472" height="241"><br>
<img src="cid:part2.3C31ED8B.E7B3A431@web.de" class=""
width="472" height="241"><br>
<br>
</div>
<blockquote style="margin:0px 0px 0px
40px;border:none;padding:0px">
<div>1.1 - It opposes for other backends (Pic 3 and 4):</div>
</blockquote>
<div><br>
</div>
<div>
<blockquote style="margin:0px 0px 0px
40px;border:none;padding:0px">
<div><img src="cid:part3.ACA6E796.D7259D7D@web.de" class=""
width="472" height="241"></div>
</blockquote>
<blockquote style="margin:0px 0px 0px
40px;border:none;padding:0px">
<div><img src="cid:part4.FF223921.D580AEA3@web.de" class=""
width="472" height="241"></div>
</blockquote>
<br>
</div>
<div>2 - When I choose Sage as my backend and try to calculate
any sheet I face a crash (Pic 5):</div>
<div><br>
</div>
<div><img src="cid:part5.B4836B6B.94AC59DD@web.de" class=""
width="472" height="236"><br>
<br>
</div>
<blockquote style="margin:0px 0px 0px
40px;border:none;padding:0px">
<div>2.1 - I generated the "backtrace" file using drkonqi tool
(attach_1).</div>
</blockquote>
<div><br>
</div>
<div>3 - The same behavior mentioned before occurs when I run
any calculation with Maxima backend (Pic 6):</div>
<div><br>
</div>
<div><img src="cid:part6.340530FC.DD22692A@web.de" class=""
width="472" height="236"><br>
<br>
</div>
<blockquote style="margin:0px 0px 0px
40px;border:none;padding:0px">
<div>3.1 - Again, I generated the "backtrace" file using
drkonqi tool (attach_2).</div>
</blockquote>
<div><br>
</div>
<div>4 - About the slowness, I tested all the backends and
marked the time (Ktimer) needed for Cantor show me the output.
I use a simple "2+2" operation:</div>
<div><br>
</div>
<div>
<ul>
<li>Julia: takes exactly 60 seconds to show the result
(every simple calculation that I've tried);</li>
<li>KAlgebra: instantly shows the result;</li>
<li>Lua (LuaJIT): instantly shows the result;</li>
<li>Maxima: crashes like I said in section 3 of this e-mail;</li>
<li>Octave: circa 15 seconds to show the result (only in the
first calculation of the section. Other simple
calculations are instantly load);</li>
<li>Python 2: circa 10~11 seconds to show the result (only
in the first calculation of the section. Other simple
calculations are instantly load);</li>
<li>Python 3: circa 5 seconds to show the result (only in
the first calculation of the section. Other simple
calculations are instantly load);</li>
<li>Qalculate!: instantly shows the result;</li>
<li>R: never shows the result. I waited about 15 minutes and
nothing. Cantor doesn't crash, but I have to close the
software to use it again.</li>
<li>Sage: crashes like I said in section 2 of this e-mail;</li>
<li>Scilab: I can't do any test with this backend because it
is still unstable on Arch Linux, so I did not install it.</li>
</ul>
</div>
<blockquote style="margin:0px 0px 0px
40px;border:none;padding:0px">
<div>4.1 - All backends used is properly installed on my
system (attach_3), with all dependencies satisfied; all
backends are properly configured in Cantor; and the follow
pic shows my system details (Pic 7):</div>
</blockquote>
<div><br>
</div>
<div>
<blockquote style="margin:0px 0px 0px
40px;border:none;padding:0px">
<div><img src="cid:part7.14112114.840557A1@web.de" class=""
width="472" height="243"><br>
<br>
</div>
</blockquote>
</div>
<div>Well, I think this is a more accurate report that I can do
by now.</div>
<div><br>
</div>
<div>I love KDE (Qt stuff in general) and its applications, and
I use them because I feel more productive with them. Cantor is
a tool that I love, and one of the reasons for me migrate to
KDE back in 2016. In that time I was using Debian GNU/Linux,
but since I met Arch, I can't leave him.</div>
<div><br>
</div>
<div>PS.: As I said before I'm a Arch Linux user, and I don't
know if its a system specific problem, but it may be difficult
for this to be the reason, because its a rolling release
distro, so I use the latest stable packages.</div>
<div><br>
</div>
<div>I like to thank all the support. Sorry for a long e-mail.</div>
<div><br>
</div>
<div>Best regards.</div>
<div class="gmail_extra">
<div class="gmail_quote"><br>
</div>
<div class="gmail_quote">-- <br>
</div>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div>
<div>
<div>
<div>
<div>Atenciosamente,<br>
</div>
<b>José Fernando de Morais Firmino.<br>
</b></div>
Graduando no Curso Superior de Tecnologia em
Automação Industrial.<br>
</div>
<span style="color:rgb(56,118,29)"><b>IFPB,</b></span>
Campus Cajazeiras.<br>
</div>
Currículo Lattes: <a
href="http://lattes.cnpq.br/0001199049062038"
target="_blank" moz-do-not-send="true">clique aqui</a>.<br>
</div>
Diretório de Grupos de Pesquisa: <a
href="http://dgp.cnpq.br/dgp/espelhorh/0001199049062038"
target="_blank" moz-do-not-send="true">clique aqui</a>.<br>
</div>
E-mail acadêmico: <a
href="mailto:fernando.morais@academico.ifpb.edu.br"
target="_blank" moz-do-not-send="true">fernando.morais@academico.ifpb.edu.br</a><br>
</div>
</div>
</div>
</div>
</blockquote>
<br>
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