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of course you're welcome to come for any subinterval. </p>
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</abstract>
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</eventitem>
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<eventitem date="2011-07-04" time="1:30 PM" room="MC 5158" title="Our Troubles with Linux and Why You Should Care">
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<short>
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<p>
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A joint work between Professors Tim Brecht, Ashif Harji, and
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Peter Buhr, this talk describes experiences using the Linux
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kernel as a platform for conducting performance evaluations.
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</p>
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</short>
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<abstract>
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<p>
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Linux provides researchers with a full-fledged operating system that is
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widely used and open source. However, due to its complexity and rapid
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development, care should be exercised when using Linux for performance
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experiments, especially in systems research. The size and continual
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evolution of the Linux code-base makes it difficult to understand, and
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as a result, decipher and explain the reasons for performance
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improvements. In addition, the rapid kernel development cycle means
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that experimental results can be viewed as out of date, or meaningless,
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very quickly. We demonstrate that this viewpoint is incorrect because
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kernel changes can and have introduced both bugs and performance
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degradations.
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</p>
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<p>
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This talk describes some of our experiences using the Linux kernel as a
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platform for conducting performance evaluations and some performance
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regressions we have found. Our results show, these performance
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regressions can be serious (e.g., repeating identical experiments
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results in large variability in results) and long lived despite having
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a large negative impact on performance (one problem appears to have
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existed for more than 3 years). Based on these experiences, we argue
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that it is often reasonable to use an older kernel version,
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experimental results need careful analysis to explain why a change in
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performance occurs, and publishing papers that validate prior research
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is essential.
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</p>
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<p>
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This is joint work with Ashif Harji and Peter Buhr.
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</p>
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<p>
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This talk will be about 20-25 minutes long with lots of time for
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questions and discussion afterwards.
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</p>
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</abstract>
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</eventitem>
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<eventitem date="2011-06-24" time="7 PM" room="Comfy Lounge" title="Code Party 2">
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<short>
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<p>
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@ -112,7 +156,7 @@
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</p>
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</abstract>
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</eventitem>
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<eventitem date="2011-06-09" time="4:30 PM" room="MC 2054"
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<eventitem date="2011-06-09" time="4:30 PM" room="MC 2054"
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title="General Purpose Computing on Graphics Cards">
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<short>
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In the first of our member talks for the term, Katie Hyatt will give a
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