added an article

added an article on ramdisks
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redoules 2018-12-24 12:18:02 +01:00
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@ -256,7 +256,7 @@ we call B the event "a blue ball is drawn" and R the event "a red ball is drawn"
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<li><a href="./linux/ramdisk.html">How to create a ramdisk?</a></li>
<li><a href="./linux/simple_bash_function.html">Create a simple bash function</a></li>
<li><a href="./linux/bashrc.html">What's inside my .bashrc ?</a></li>
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@ -172,7 +172,7 @@ USER;PID;%CPU;%MEM;VSZ;RSS;TTY;STAT;START;TIME;COMMAND</p>
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<h1>
How to create a ramdisk?
</h1>
<ol class="breadcrumb">
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<time class="published" datetime="2018-12-24T11:58:00+01:00">
24 décembre 2018
</time>
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<li>Linux</li>
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<div class='article_content'>
<h2>Writing to a SSD</h2>
<p>Let's first write 500Mo to a ssd with the command :</p>
<div class="highlight"><pre><span></span>dd <span class="k">if</span><span class="o">=</span>/dev/zero <span class="nv">of</span><span class="o">=</span>test.iso <span class="nv">bs</span><span class="o">=</span>1M <span class="nv">count</span><span class="o">=</span><span class="m">500</span>
</pre></div>
<p>On my machine with a ssd I get the following results</p>
<div class="highlight"><pre><span></span>500+0 records in
500+0 records out
524288000 bytes (524 MB, 500 MiB) copied, 10,153 s, 51,6 MB/s
</pre></div>
<h2>Writing to a ramdisk</h2>
<p>Let's now create a temporary ram disk and see how faster it is </p>
<div class="highlight"><pre><span></span>mkdir /mnt/ram
mount -t tmpfs tmpfs /mnt/ram -o <span class="nv">size</span><span class="o">=</span>600M
<span class="nb">cd</span> /mnt/ram
dd <span class="k">if</span><span class="o">=</span>/dev/zero <span class="nv">of</span><span class="o">=</span>test.iso <span class="nv">bs</span><span class="o">=</span>1M <span class="nv">count</span><span class="o">=</span><span class="m">500</span>
</pre></div>
<p>The results yield a faster write time : </p>
<div class="highlight"><pre><span></span>500+0 records in
500+0 records out
524288000 bytes (524 MB, 500 MiB) copied, 6,39849 s, 81,9 MB/s
</pre></div>
<p>on a machine with linux installed natively the results shoud be even faster.</p>
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@ -151,7 +151,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -208,7 +208,7 @@ The secret number is 126
<footer class="footer">
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -160,7 +160,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -234,7 +234,7 @@ Where Y=a+b*X
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -248,7 +248,7 @@ b_2\\
<footer class="footer">
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<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -1033,7 +1033,7 @@ Top dislike features:
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<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -196,7 +196,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -256,7 +256,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -233,7 +233,7 @@ So :
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -214,7 +214,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -195,7 +195,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -203,7 +203,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -197,7 +197,7 @@ and B are considered to be independent if event A has no effect on the probabili
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<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -221,7 +221,7 @@ where <span class="math">\(erf\)</span> is the error function:
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -206,7 +206,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -222,7 +222,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
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@ -223,7 +223,7 @@ $$</div>
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -145,7 +145,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -192,7 +192,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -241,7 +241,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -235,7 +235,7 @@ At line 5 there is a plum which is purple and contains 28 kcal
<footer class="footer">
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -378,7 +378,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -168,7 +168,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -192,7 +192,7 @@ If you try to open a non existing file in read mode 'r', a FileNotFoundError wil
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -176,7 +176,7 @@ conda install numpy --channel intel --override-channels
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<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -237,7 +237,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -186,7 +186,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -171,7 +171,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -339,7 +339,7 @@ However, exporting to a sql database can prove very useful. Indeed, having a wel
<footer class="footer">
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -181,7 +181,7 @@ The number 4 appears 1 times in the list
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -338,7 +338,7 @@ http://127.0.0.1:8787/status</p>
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -148,7 +148,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -232,7 +232,7 @@ The list of dependencies required to test, build and generate the doc are listed
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -164,7 +164,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -218,7 +218,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -177,7 +177,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -213,7 +213,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

View File

@ -248,7 +248,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -237,7 +237,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -156,7 +156,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -173,7 +173,7 @@ Reversed array : [4 3 2 1 0]
<footer class="footer">
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<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -192,7 +192,7 @@ Sorted array : [0.13876208 0.19939047 0.40021786 0.43734158 0.46015169]
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<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -381,7 +381,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
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@ -171,7 +171,7 @@ Numpy array with unique values : [10 20 30 40 50 60]
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<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -151,7 +151,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -112,7 +112,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -5,7 +5,7 @@ xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>redoules.github.io/</loc>
<lastmod>2018-12-16T11:43:13-00:00</lastmod>
<lastmod>2018-12-24T12:16:50-00:00</lastmod>
<changefreq>daily</changefreq>
<priority>0.5</priority>
</url>
@ -17,6 +17,13 @@ xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<priority>0.5</priority>
</url>
<url>
<loc>redoules.github.io/linux/ramdisk.html</loc>
<lastmod>2018-12-24T11:58:00+01:00</lastmod>
<changefreq>monthly</changefreq>
<priority>0.5</priority>
</url>
<url>
<loc>redoules.github.io/mathematics/KLD.html</loc>
<lastmod>2018-12-16T10:54:00+01:00</lastmod>

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@ -344,7 +344,7 @@ Done.
<footer class="footer">
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<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -631,7 +631,7 @@ Done.
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -216,7 +216,7 @@ Done.
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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@ -346,7 +346,7 @@ Done.
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 78 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 79 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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