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	<title>sense-especificar &amp;laquo; WordPress.com Tag Feed</title>
	<link>http://en.wordpress.com/tag/sense-especificar/</link>
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	<pubDate>Sun, 27 Dec 2009 23:42:09 +0000</pubDate>

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<title><![CDATA[Reclamació oberta a Telefònica: PENDENT!]]></title>
<link>http://eiximenys.wordpress.com/2009/08/05/josep-anguera-i-saez-carta-enviada-al-president-i-al-director-general-de-telefonica-per-les-anteriors-reclamacions-no-solucionades-del-tot-encara/</link>
<pubDate>Wed, 05 Aug 2009 13:29:00 +0000</pubDate>
<dc:creator>eiximenys</dc:creator>
<guid>http://eiximenys.wordpress.com/2009/08/05/josep-anguera-i-saez-carta-enviada-al-president-i-al-director-general-de-telefonica-per-les-anteriors-reclamacions-no-solucionades-del-tot-encara/</guid>
<description><![CDATA[josep anguera i saez: CARTA ENVIADA AL PRESIDENT I AL DIRECTOR GENERAL DE TELEFÒNICA PER LES ANTERIO]]></description>
<content:encoded><![CDATA[<div class='snap_preview'><p style="text-align:justify;"><a href="http://josepanguerasaez.blogspot.com/2009/08/carta-enviada-al-president-i-al.html?zx=b90349b72f8cac4f">josep anguera i saez: CARTA ENVIADA AL PRESIDENT I AL DIRECTOR GENERAL DE TELEFÒNICA PER LES ANTERIORS RECLAMACIONS NO SOLUCIONADES DEL TOT ENCARA</a></p>
<div style="text-align:center;">&#8212;&#8211;</div>
<p>* <span style="font-style:italic;">jimisljo</span> afegeix: veure també <a href="http://www.timofonicas.com/">http://www.timofonicas.com/</a></p>
<p><span style="font-weight:bold;">Aquest enllaç d&#8217;aquí no surt fins que al Josep li solucionin el problema.</span></p>
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<item>
<title><![CDATA[El futur dels llenguatges dinàmics i del paral·lelisme…]]></title>
<link>http://mariasalamo.wordpress.com/2008/10/28/el-futur-dels-llenguatges-dinamics-i-del-paral%c2%b7lelisme%e2%80%a6/</link>
<pubDate>Tue, 28 Oct 2008 17:40:11 +0000</pubDate>
<dc:creator>mariasalamo</dc:creator>
<guid>http://mariasalamo.wordpress.com/2008/10/28/el-futur-dels-llenguatges-dinamics-i-del-paral%c2%b7lelisme%e2%80%a6/</guid>
<description><![CDATA[He fet una ullada a aquest article &#8220;Dynamic programming futures&#8221; JavaScript, Perl, PHP, ]]></description>
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<p>He fet una ullada a aquest article &#8220;<a href="http://www.infoworld.com/article/08/10/13/42TC-dynamic-futures_1.html">Dynamic programming futures</a>&#8221; <em>JavaScript, Perl, PHP, Python, Ruby, and other dynamic languages are remaking the Web and bringing programming to the masses. Where should developers place their bets?</em> i m&#8217;ha resultat interessant. Al final deixa caure la importància de la seva adaptació als multi-core i per extensió al paral·lelisme. No ho diu explícitament però fa referència la llibreria &#8220;<a href="http://docs.python.org/dev/library/multiprocessing.html">multiprocessing</a>&#8221; que ja ve de sèrie des de Python 2.6 (té la mateixa api que la de threads, però corre en diferents processos que poden estar en diferents cores&#8230;).</p>
<p>De fet, fa uns dies vaig cercar què hi havia sobre paral·lelisme a Python:</p>
<p>Fent una ullada a la <a href="http://wiki.python.org/moin/ParallelProcessing">documentació oficial</a>, apareixen <strong>moltes opcions</strong>, i em vaig fixar en 3: multiprocessing, parallelpython i pythonBSP.</p>
<p>Sobre les dos primeres aquest <a href="http://www.doughellmann.com/articles/CompletelyDifferent-2007-10-multiprocessing/index.html">article</a> en parla amb exemples:<br />
&#8220;&#8221;&#8221;<br />
Both the processing package and Parallel Python tackle the issues of multi-processing in Python head on, from different directions. Where the <strong>processing [multiprocessing] package tries to fit itself into existing threading designs</strong>, <strong>pp uses a more explicit distributed job model</strong>. Each approach has benefits and drawbacks, and neither is suitable for every situation. Both, however, save you a lot of time over the alternative of writing everything yourself with low-level libraries. What an age to be alive!<br />
&#8220;&#8221;&#8221;<br />
La de &#8220;<a href="http://www.parallelpython.com/content/view/17/31/#SUM_PRIMES">parallelpython</a>&#8221; és molt explícita pel que fa a &#8220;repartir feines entre màquines&#8221;, i la la de &#8220;<a href="http://www.computer.org/portal/site/cise/menuitem.92a12adebee18778161489108bcd45f3/index.jsp?&#38;pName=cise_level1_article&#38;TheCat=1001&#38;path=cise/2007/n6&#38;file=sci.xml&#38;;jsessionid=Lvknv1XggWZ5gRTpVHb7r4KpnykKrXDTgkJXk1yCj1R6l1h9R6rh!1912462927">pythonBSP</a>&#8221; aplica un paradigma diferent:<br />
&#8220;&#8221;&#8221;<br />
Message passing and multithreading aren’t the only models developed for parallel computing.<br />
[...]<br />
Synchronization is particularly unpleasant to deal with explicitly because bugs in synchronization handling are very hard to analyze.<br />
[...]<br />
In the rest of this article, I’ll try to convince you that a level-two model [Explicit: parallelism,comm; Implicit: sync] is much easier to work with, especially when combined with a high-level programming language such as Python.<br />
[...]<br />
<strong>BSP computations =  sequence of supersteps</strong><br />
<strong>superstep =</strong> computation(independent) + communication + barrier sync<br />
combining comm/sync = impossibility of deadlocks (BSP prefered versus MPI!!!)<br />
&#8220;&#8221;&#8221;</p>
<p>Finalment, veig que l&#8217;autor de &#8220;Programming Patterns&#8221; té una presentació sobre &#8220;<a href="http://herbsutter.wordpress.com/2008/09/25/ralph-johnson-on-parallel-programming-patterns/">Parallel Programming Patterns</a>&#8221; que comença a &#8220;sistematitzar&#8221; aquest tipus de programació&#8230;</p>
<p>Posted in Sense especificar&#160;&#160;&#160;&#160;&#160;&#160;<a rel="nofollow" href="http://feeds.wordpress.com/1.0/gocomments/guaita.wordpress.com/61/"></div>
<p> By &#124; <a href="http://guaita.wordpress.com/2008/10/15/el-futur-dels-llenguatges-dinamics-i-del-paral%c2%b7lelisme/">Guaita</a></p></p>
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