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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Liyang,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">These questions are probably best asked in the Phoenix MapReduce mailing list (phoenix-users@lists.stanford.edu), rather than the Barrelfish list.
The Barrelfish behavior of Phoenix should be identical to the Linux one.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hope this helps,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Liyang [mailto:tangliyang921@gmail.com]
<br>
<b>Sent:</b> Samstag, 24. Dezember 2011 03:24<br>
<b>To:</b> barrelfish-users@lists.inf.ethz.ch<br>
<b>Subject:</b> [Barrelfish-users] questions about phoenix kmeans<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I've read the kmeans code here: <a href="http://www.lingrok.org/source/xref/barrelfish/usr/phoenix_tests/kmeans.c" target="_blank"><span style="color:#1155CC">http://www.lingrok.org/source/xref/barrelfish/usr/phoenix_tests/kmeans.c</span></a>.
I wonder if you maintain the code, but I don't know who else to contact.<o:p></o:p></p>
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<p class="MsoNormal">I do have some questions about using phoenix in kmeans.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<pre style="background:white;white-space:pre-wrap"><o:p> </o:p></pre>
<pre style="background:white"><o:p> </o:p></pre>
<pre style="background:white"><a href="http://www.lingrok.org/source/xref/barrelfish/usr/phoenix_tests/kmeans.c#map_reduce_args" target="_blank"><b><span style="color:#993366;text-decoration:none">map_reduce_args</span></b></a>.<a href="http://www.lingrok.org/source/s?defs=L1_cache_size&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">L1_cache_size</span></a> = <a href="http://www.lingrok.org/source/s?defs=atoi&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">atoi</span></a>(<a href="http://www.lingrok.org/source/s?defs=GETENV&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">GETENV</span></a>(<span style="color:green">"MR_L1CACHESIZE"</span>));<span style="color:#666666">//1024 * 8;</span><o:p></o:p></pre>
<pre style="background:white"><a href="http://www.lingrok.org/source/xref/barrelfish/usr/phoenix_tests/kmeans.c#map_reduce_args" target="_blank"><b><span style="color:#993366;text-decoration:none">map_reduce_args</span></b></a>.<a href="http://www.lingrok.org/source/s?defs=num_map_threads&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">num_map_threads</span></a> = <a href="http://www.lingrok.org/source/s?defs=atoi&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">atoi</span></a>(<a href="http://www.lingrok.org/source/s?defs=GETENV&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">GETENV</span></a>(<span style="color:green">"MR_NUMTHREADS"</span>));<span style="color:#666666">//8;</span><o:p></o:p></pre>
<pre style="background:white"><a href="http://www.lingrok.org/source/xref/barrelfish/usr/phoenix_tests/kmeans.c#map_reduce_args" target="_blank"><b><span style="color:#993366;text-decoration:none">map_reduce_args</span></b></a>.<a href="http://www.lingrok.org/source/s?defs=num_reduce_threads&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">num_reduce_threads</span></a> = <a href="http://www.lingrok.org/source/s?defs=atoi&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">atoi</span></a>(<a href="http://www.lingrok.org/source/s?defs=GETENV&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">GETENV</span></a>(<span style="color:green">"MR_NUMTHREADS"</span>));<span style="color:#666666">//16;</span><o:p></o:p></pre>
<pre style="background:white"><a href="http://www.lingrok.org/source/xref/barrelfish/usr/phoenix_tests/kmeans.c#map_reduce_args" target="_blank"><b><span style="color:#993366;text-decoration:none">map_reduce_args</span></b></a>.<a href="http://www.lingrok.org/source/s?defs=num_merge_threads&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">num_merge_threads</span></a> = <a href="http://www.lingrok.org/source/s?defs=atoi&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">atoi</span></a>(<a href="http://www.lingrok.org/source/s?defs=GETENV&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">GETENV</span></a>(<span style="color:green">"MR_NUMTHREADS"</span>));<span style="color:#666666">//8;</span><o:p></o:p></pre>
<pre style="background:white"><a href="http://www.lingrok.org/source/xref/barrelfish/usr/phoenix_tests/kmeans.c#map_reduce_args" target="_blank"><b><span style="color:#993366;text-decoration:none">map_reduce_args</span></b></a>.<a href="http://www.lingrok.org/source/s?defs=num_procs&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">num_procs</span></a> = <a href="http://www.lingrok.org/source/s?defs=atoi&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">atoi</span></a>(<a href="http://www.lingrok.org/source/s?defs=GETENV&project=barrelfish" target="_blank"><span style="color:#202062;text-decoration:none">GETENV</span></a>(<span style="color:green">"MR_NUMPROCS"</span>));<span style="color:#666666">//16;</span><o:p></o:p></pre>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">How could the above codes get the values for args? I mean, where are those MR_ environment variables defined? And what if they are not? Does the cache size variable has any connection with the splitter function? I know that phoenix schedules
threads according to cache size as chunk size, but how?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I would be much appreciated if you could help me with these questions.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards,<o:p></o:p></p>
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<p class="MsoNormal">- Liyang<o:p></o:p></p>
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