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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#DDFFDD">MultiThreader</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#DDFFDD">::</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#DDFFDD">MultiThreader</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#DDFFDD">()</span><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">:</span><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99"> m_ThreadPool</span><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">(</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#99FF99">ThreadPool</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">::</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#99FF99">New</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">()</span><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99">
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99"> m_ThreadPool</span><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">-></span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#99FF99">InitializeThreads</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">(</span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#99FF99">GetGlobalDefaultNumberOfThreads</span></b><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">()</span><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">*</span><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99">
</span><span style="font-size:8.0pt;font-family:"Courier New";color:#004444;background:#99FF99">2</span><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">);</span><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I was aware of this issue and had mentioned about this to Jim – If we demand too many simumtaneous pthreads to be started, the pthread_create call returns error
code 11 (<a href="http://pubs.opengroup.org/onlinepubs/7908799/xsh/pthread_create.html">http://pubs.opengroup.org/onlinepubs/7908799/xsh/pthread_create.html</a></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">). So if the above call returns the correct number of threads, I think we should be fine unless we are creating more than one “thread pools”.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Umang Brahmakshatriya</span></b><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Advanced Computing Lab</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">GE Global Research</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">1 Research Circle K1-3A37C</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Niskayuna, NY 12309</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Bradley Lowekamp [mailto:blowekamp@mail.nih.gov]
<br>
<b>Sent:</b> Monday, April 07, 2014 9:13 AM<br>
<b>To:</b> Miller, James V (GE Global Research)<br>
<b>Cc:</b> Brahmakshatriya, Umang (GE Global Research); insight-developers@itk.org<br>
<b>Subject:</b> Re: [ITK-dev] [ITK] Thread Pool patch<o:p></o:p></span></p>
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<p class="MsoNormal">Jim,<o:p></o:p></p>
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<p class="MsoNormal">Yes it was. But I set ITK_GLOBAL_DEFAULT_NUMBER_OF_THREADS to 8, and did ctest -j 8 initially, then I scaled back from there with lack of complete success in testing. There are thread management issue with the current patch. <o:p></o:p></p>
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<p class="MsoNormal">Brad<o:p></o:p></p>
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<p class="MsoNormal">On Apr 4, 2014, at 2:06 PM, Miller, James V (GE Global Research) <<a href="mailto:millerjv@ge.com">millerjv@ge.com</a>> wrote:<o:p></o:p></p>
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"Too many threads" is a bit odd. Umang does initialize the pool with a set of threads, then adds threads as needed. I believe the thread initialization is based on the number of cores. But in principle, the initialization could be as low as 0 or 1 threads.<o:p></o:p></p>
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<p class="MsoNormal">I missed that in the patch. This is what I saw:<o:p></o:p></p>
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<p class="MsoNormal"><span class="pln"><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99">m_Threadpool</span></span><span class="pun"><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">(</span></span><span class="pln"><span style="font-size:8.0pt;font-family:"Courier New";color:black;background:#99FF99">m_Threadpoolfactory</span></span><span class="pun"><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">.</span></span><span class="typ"><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#99FF99">GetSmartThreadPool</span></b></span><span class="pun"><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">(</span></span><span class="typ"><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#99FF99">GetGlobalDefaul</span></b></span><b><span style="font-size:8.0pt;font-family:"Courier New";color:#440044;background:#99FF99"><br>
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</span></span><span class="pun"><span style="font-size:8.0pt;font-family:"Courier New";color:#444400;background:#99FF99">)</span></span><span style="font-size:8.0pt;font-family:"Courier New";color:black"><o:p></o:p></span></p>
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Was this on one of your giant core machines?<br>
<br>
Jim<br>
<br>
Brad<br>
<br>
On Apr 4, 2014, at 10:42 AM, Brahmakshatriya, Umang (GE Global Research) <<a href="mailto:brahmaks@ge.com">brahmaks@ge.com</a><<a href="mailto:brahmaks@ge.com">mailto:brahmaks@ge.com</a>>> wrote:<br>
<br>
Hi All,<br>
<br>
My name is Umang, I am working to submit the Thread Pool patch. Can anyone help me through the final steps of submitting it? I had a few issues creating the patches.<br>
I am available next week at these times:<br>
Tuesday 4/8 – 2.30p to 5p EST<br>
Wednesday 4/9 - 9.30am to 12p EST<br>
Thursday 4/10 - 2.30p to 5p EST<br>
<br>
Let me know which time works best and I will setup a t-con and webex / google hangout.<br>
<br>
<br>
<br>
Umang Brahmakshatriya<br>
Advanced Computing Lab<br>
GE Global Research<br>
1 Research Circle K1-3A37C<br>
Niskayuna, NY 12309<br>
<br>
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