<div dir="ltr">The option to change the number of thread pools might very well go away in the future. I guess PHK wasn't sure how much locking and CPU affinity would influence the performance of the pools. In order to know you have to implement it. A lot of the tunables are like that, values based on guesses, not necessary exact measurements. </div>
<div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, May 3, 2013 at 12:34 AM, Stephen Wood <span dir="ltr"><<a href="mailto:smwood4@gmail.com" target="_blank">smwood4@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Are there any exceptions to the "2 is best" rule for this? I'm asking out of curiosity. It seems strange to me that Varnish would even provide the option to change it if any other value is detrimental to performance.</div>
<div class="HOEnZb"><div class="h5">
<div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, May 2, 2013 at 2:02 PM, Per Buer <span dir="ltr"><<a href="mailto:perbu@varnish-software.com" target="_blank">perbu@varnish-software.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">That is correct. We haven't been able to see any increase in performance when the number of pools is increased above 2.</div>
<div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>On Thu, May 2, 2013 at 4:31 PM, Rangel, Raul <span dir="ltr"><<a href="mailto:Raul.Rangel@disney.com" target="_blank">Raul.Rangel@disney.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I think someone recently commented that 2 thread pools is the ideal value. Anymore and you don’t see a performance increase.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Raul<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in">
<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""> <a href="mailto:varnish-misc-bounces@varnish-cache.org" target="_blank">varnish-misc-bounces@varnish-cache.org</a> [mailto:<a href="mailto:varnish-misc-bounces@varnish-cache.org" target="_blank">varnish-misc-bounces@varnish-cache.org</a>] <b>On Behalf Of </b><a href="mailto:lnsano@bol.com.br" target="_blank">lnsano@bol.com.br</a><br>
<b>Sent:</b> Wednesday, March 06, 2013 2:23 PM<br><b>To:</b> <a href="mailto:varnish-misc@varnish-cache.org" target="_blank">varnish-misc@varnish-cache.org</a><br><b>Subject:</b> varnish 3 - thread_pools<u></u><u></u></span></p>
</div><div><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">Hi,<u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">By the book, the thread_pools should be 2. However the server is multi-processed(8 cpus) and can handle more thread_pools.<u></u><u></u></p>
</div><div><p class="MsoNormal">This server handles more than 5000 requests/sec. <u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Is it a good ideia increasing the thread_pools to 8 and decreasing the thread_pool_max?<u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">regards,<u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Leandro Sano<u></u><u></u></p>
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