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		<title>Mariasalamo's Blog</title>
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		<title>Ciencia de locos por ciencia loca</title>
		<link>http://mariasalamo.wordpress.com/2010/01/11/ciencia-de-locos-por-ciencia-loca/</link>
		<comments>http://mariasalamo.wordpress.com/2010/01/11/ciencia-de-locos-por-ciencia-loca/#comments</comments>
		<pubDate>Mon, 11 Jan 2010 16:49:57 +0000</pubDate>
		<dc:creator>mariasalamo</dc:creator>
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		<description><![CDATA[La ciencia loca por Victoria Gracia que public&#243; una foto: Hemos visto el mensajeEscrito en la paredY empezamos este viajePensando en no volver (La diferencia entre la fe y la ciencia &#8211; Fangoria) By &#124; Cargas de Victoria Gracia<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=mariasalamo.wordpress.com&amp;blog=5327322&amp;post=6&amp;subd=mariasalamo&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
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</p>
<p>        <a href="http://www.flickr.com/people/victoriagracia/">La ciencia loca         por Victoria Gracia</a> que public&#243; una foto:      </p>
<p>        <a title="Ciencia loca" href="http://www.flickr.com/photos/victoriagracia/4151234032/"><img height="240" alt="Ciencia loca" width="180" src="http://mariasalamo.files.wordpress.com/2010/01/wpid-4151234032_1e3203e79e_m.jpg?w=180&#038;h=240">        </a>      </p>
<p>        Hemos visto el mensaje<br />Escrito en la pared<br />Y empezamos este viaje<br />Pensando         en no volver</p>
<p>(<a rel="nofollow" href="http://www.goear.com/listen/0fea890/la-diferencia-entre-la-fe-y-la-ciencia-fangoria">La         diferencia entre la fe y la ciencia</a> &#8211; Fangoria)      </p>
<p> By | <a href="http://www.flickr.com/photos/victoriagracia/4151234032/">Cargas de Victoria Gracia</a></p></p>
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			<media:title type="html">Ciencia loca</media:title>
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		<title>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>
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		<pubDate>Tue, 28 Oct 2008 17:40:11 +0000</pubDate>
		<dc:creator>mariasalamo</dc:creator>
				<category><![CDATA[Sense especificar]]></category>

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		<description><![CDATA[He fet una ullada a aquest article &#8220;Dynamic programming futures&#8221; 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? i m&#8217;ha resultat interessant. Al final deixa caure la importància de la seva adaptació als multi-core i per extensió al [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=mariasalamo.wordpress.com&amp;blog=5327322&amp;post=3&amp;subd=mariasalamo&amp;ref=&amp;feed=1" width="1" height="1" />]]></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 | <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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		<title>Hello world!</title>
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		<pubDate>Tue, 28 Oct 2008 15:02:14 +0000</pubDate>
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