Sorry, I have to amend my statement.&nbsp; I just ran an experiment which launched 10000 threads vs launching 4 threads and doing the same amount of work.&nbsp; Results seem to indicate that the former is quite expensive on Linux too -- about 2 orders of magnitude different in my test.<br>
<br>Note that some of this effect could also be from side effects from time slicing, etc... in the kernel scheduler.<br><br>&nbsp; Brian<br><br><div class="gmail_quote">On Jan 29, 2008 11:25 AM, Brian Budge &lt;<a href="mailto:brian.budge@gmail.com">brian.budge@gmail.com</a>&gt; wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi James -<br><br>My impression was that creating new threads on Windows can be quite expensive, but I don&#39;t have a lot of experience there.&nbsp; Creating threads in Linux using posix_threads (also via boost) seems to be quite fast.<br>

<br>However, I have noticed that thread_groups are much slower (factor of 4) than using my own vector&lt;boost::thread*&gt; and joining each individually.&nbsp; This is probably because I have only one controlling thread for my vector, so I don&#39;t need mutex.<br>
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<br>&nbsp; Brian</font><div><div></div><div class="Wj3C7c"><br><br><div class="gmail_quote">On Jan 29, 2008 10:28 AM, James Sutherland &lt;<a href="mailto:James.Sutherland@utah.edu" target="_blank">James.Sutherland@utah.edu</a>&gt; wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>On 1/29/08 9:54 AM, &quot;Sebastian Gesemann&quot; &lt;<a href="mailto:s.gesemann@gmail.com" target="_blank">s.gesemann@gmail.com</a>&gt; wrote:<br><br>&gt; You may want to try<br><a href="http://threadpool.sourceforge.net/" target="_blank">http://threadpool.sourceforge.net/</a><br>

<br></div>I was looking into that, but was wondering if anyone had experience to<br>suggest that creation/destruction of threads was a significant overhead<br>before I implement pools.<br><font color="#888888"><br>James<br>

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