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Hello,<br>
<br>
See my responses in-line. <br>
<br>
On 07/08/2011 10:13 AM, dongwflj wrote:
<blockquote
cite="mid:af78bb.eff4.13108984b71.Coremail.dongwflj@163.com"
type="cite">Hi:<br>
I am not sure if here is the right place to ask, I just read why
need 2.0 design page, and as below said:<br>
<p class="vspace">The <strong>issues</strong> that the new design
tries to solve are:
</p>
<ul>
<li><strong>I/O blocking</strong> (transport, DB, applications)
</li>
<li><strong>scaling with the hardware</strong> resources (I/O
and parallel processing sync is a bottleneck with the current
design)
</li>
</ul>
So could anyone share more detail scenario about I/O blocking and
parallel processing sync? How much performance downgrade due to
these bottleneck in 1.X version?<br>
</blockquote>
<br>
The performance downgrade depends very much on the configuration
file. The more functionality that you integrate ( like accounting to
DB, etc ) that need to block for I/O, the bigger the performance
downgrade. There have been some tests done that show what is the
performance penalty you get when using various OpenSIPS features
like dialog support, DB authentication, DB accounting. See [1]<br>
<br>
<blockquote
cite="mid:af78bb.eff4.13108984b71.Coremail.dongwflj@163.com"
type="cite"><br>
As my understanding, server have multiple processes to handle
parallel incoming messages, the DB operation will block a
process's work stream, but how about transport and application as
mentioned above, how it can block the work stream?<br>
<br>
Best Regards<br>
Ewen<br>
</blockquote>
<br>
For transport, TCP can block. If the TCP stack buffers get filled
up, an attempt to send a message via TCP will block until there is
enough space. DNS will also block SIP processing, Radius
communication will do the same. <br>
<br>
[1] <a class="moz-txt-link-freetext" href="http://www.opensips.org/Resources/StressTests">http://www.opensips.org/Resources/StressTests</a><br>
<br>
<br>
Regards,<br>
<pre class="moz-signature" cols="72">--
Vlad Paiu
OpenSIPS Developer</pre>
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