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	<title>Morning Beans</title>
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		<title>Morning Beans</title>
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		<title>Distributed Mandelbrot computation with HTML5 workers</title>
		<link>http://bdup.wordpress.com/2010/11/11/mdbrot-with-html5-workers/</link>
		<comments>http://bdup.wordpress.com/2010/11/11/mdbrot-with-html5-workers/#comments</comments>
		<pubDate>Thu, 11 Nov 2010 20:34:41 +0000</pubDate>
		<dc:creator>Ben</dc:creator>
				<category><![CDATA[HTML5]]></category>

		<guid isPermaLink="false">http://bdup.wordpress.com/?p=22</guid>
		<description><![CDATA[Computing fractals usually requires lots of CPU cycles and taking advantage of today&#8217;s multicore processors allows us to speed-up the computation. The HTML5 specification defines a new API for parallel computation known as Web Workers. In the example available here, &#8230; <a href="http://bdup.wordpress.com/2010/11/11/mdbrot-with-html5-workers/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bdup.wordpress.com&amp;blog=10460192&amp;post=22&amp;subd=bdup&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Computing fractals usually requires lots of CPU cycles and taking advantage of today&#8217;s multicore processors allows us to speed-up the computation. The HTML5 specification defines a new API for parallel computation known as <a href="http://dev.w3.org/html5/workers/">Web Workers</a>. In the example available <a href="http://users.skynet.be/igloo/html5/workers/mandelbrot.html">here</a>, the Mandelbrot figure is computed with HTML5 workers and displayed using an HTML5 canvas.</p>
<div id="attachment_29" class="wp-caption aligncenter" style="width: 260px"><a href="http://bdup.files.wordpress.com/2010/11/mandelbrot.jpg"><img class="size-full wp-image-29 " title="The Mandelbrot" src="http://bdup.files.wordpress.com/2010/11/mandelbrot.jpg?w=640" alt=""   /></a><p class="wp-caption-text">The Mandelbrot fractal figure</p></div>
<p>The distributed computation is made according to the scheduler/worker scheme.</p>
<p>The scheduler is responsible for starting the workers, feeding them with the description of their task, and drawing a dot on the canvas for each result received from a worker. Assuming that the work is distributed among <em>n</em> workers, the drawing area is divided in <em>n</em> equal parts and each worker receives its part of the work. A worker iterates on the dots contained in its area and evaluates the Mandelbrot value for each dot. Each computed value is then communicated to the scheduler through the event handling system defined by the web workers API.</p>
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			<media:title type="html">The Mandelbrot</media:title>
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		<title>NetBeans mobile device emulator fails on x64 Linux system</title>
		<link>http://bdup.wordpress.com/2010/01/21/netbeans-mobile-device-emulator-fails-on-x64-linux-system/</link>
		<comments>http://bdup.wordpress.com/2010/01/21/netbeans-mobile-device-emulator-fails-on-x64-linux-system/#comments</comments>
		<pubDate>Thu, 21 Jan 2010 21:07:51 +0000</pubDate>
		<dc:creator>Ben</dc:creator>
				<category><![CDATA[Config]]></category>
		<category><![CDATA[Java]]></category>

		<guid isPermaLink="false">http://bdup.wordpress.com/?p=7</guid>
		<description><![CDATA[The mobile device emulator fails to start with this error: java.lang.UnsatisfiedLinkError: /home/myuser/WTK2.5.1/bin/sublime.so: /home/myuser/WTK2.5.1/bin/sublime.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch) My config: Ubuntu Karmic x64, OpenJDK-6 x64, NetBeans-6.8 The solution in my case is to change the &#8230; <a href="http://bdup.wordpress.com/2010/01/21/netbeans-mobile-device-emulator-fails-on-x64-linux-system/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bdup.wordpress.com&amp;blog=10460192&amp;post=7&amp;subd=bdup&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>The mobile device emulator fails to start with this error:</p>
<p><span style="font-family:verdana,sans-serif;color:#203025;">java.lang.UnsatisfiedLinkError: /home/myuser/WTK2.5.1/bin/sublime.so: /home/myuser/WTK2.5.1/bin/sublime.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch)</span></p>
<p>My config: Ubuntu Karmic x64, OpenJDK-6 x64, NetBeans-6.8</p>
<p>The solution in my case is to change the vm used by the emulator:</p>
<p>Install the 32 bits java vm:</p>
<div style="font-family:verdana,sans-serif;color:#203025;border:dashed 1px orange;padding:3px 3px 3px 15px;">$ sudo apt-get install ia32-sun-java6-bin</div>
<p>Then edit netbeans_home/mobility8/WTK2.5.2/bin/emulator and set</p>
<div style="font-family:verdana,sans-serif;color:#203025;border:dashed 1px orange;padding:3px 3px 3px 15px;">javapathtowtk=/usr/lib/jvm/ia32-java-6-sun/bin/</div>
<p>with the trailing slash!</p>
<p>Now it works.</p>
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		<title>A First Contact with JQuery</title>
		<link>http://bdup.wordpress.com/2009/11/28/a-first-contact-with-jquery/</link>
		<comments>http://bdup.wordpress.com/2009/11/28/a-first-contact-with-jquery/#comments</comments>
		<pubDate>Sat, 28 Nov 2009 09:31:13 +0000</pubDate>
		<dc:creator>Ben</dc:creator>
				<category><![CDATA[jQuery]]></category>

		<guid isPermaLink="false">http://bdup.wordpress.com/?p=4</guid>
		<description><![CDATA[JQuery is a javascript library based on a query+computation principle. A jQuery statement is made of two parts: a query on the DOM elements and a computation applied to all elements selected by the query. Some jQuery based libraries: the &#8230; <a href="http://bdup.wordpress.com/2009/11/28/a-first-contact-with-jquery/">Continue reading <span class="meta-nav">&#8594;</span></a><img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=bdup.wordpress.com&amp;blog=10460192&amp;post=4&amp;subd=bdup&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><a href="http://jquery.com/">JQuery</a> is a javascript library based on a query+computation principle. A jQuery statement is made of two parts: a query on the DOM elements and a computation applied to all elements selected by the query.</p>
<p>Some jQuery based libraries:</p>
<ul>
<li> the <a href="http://blog.flipbit.co.uk/2009/03/jquery-image-annotation-plugin.html">image annotation plugin</a>.</li>
<li><a href="http://jqueryui.com/">JQuery UI</a></li>
</ul>
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