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<p>Thank you Tim for your response. I am running Tor 0.2.9.11 on
ubuntu linux. I have not implemented a caching DNS at this point
and may not do so. I'm not sure how this problem progressed but I
notices that arm was slower and more difficult to call up in
recent weeks. This is not an old exit. It's been running about
10 weeks. A recent back down of bandwidth did little to resolve
the problem.</p>
<p>I get the sense that Tor will not use the second CPU since I
tried to reset the server recently. nothing else on the VPS uses
more that 0.8% of CPU.</p>
<p>Unlikely that it will help but the fingerprint of this relay is <br>
</p>
<pre>B06F093A3D4DFAD3E923F4F28A74901BD4F74EB1
Torexitmoldova.
Thanks so much for your interest.
Larry
</pre>
<br>
<div class="moz-cite-prefix">On 6/29/2017 6:11 PM, teor wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AA44359B-8CA6-49BD-9EF7-7C0FD0B7D53D@gmail.com">
<pre wrap="">
</pre>
<blockquote type="cite">
<pre wrap="">On 30 Jun 2017, at 04:52, Arisbe <a class="moz-txt-link-rfc2396E" href="mailto:arisbe@cni.net"><arisbe@cni.net></a> wrote:
I have a small Tor exit relay (VPS) running at +90% CPU capacity.
</pre>
</blockquote>
<pre wrap="">
What version of Tor?
Has this only happened recently?
Did you upgrade your Tor version?
Are you running a caching DNS server?
</pre>
<blockquote type="cite">
<pre wrap=""> Memory usage is negligible. I am unable to launch ARM as the single CPU cannot process both Tor and arm. Traffic is mostly high for a small node.
I have CPUsNum set at 2 in my torrc from its original setup.
</pre>
</blockquote>
<pre wrap="">
Have you tried removing this from your torrc?
</pre>
<blockquote type="cite">
<pre wrap="">However, pidstat 5 -p <pid> shows that only 1 CPU is employed. lscpu shows that the VPS is allotted 2 cpus.
</pre>
</blockquote>
<pre wrap="">
2 cores, or hyperthreading on the same core?
Do you have any CPU masking options set?
Tor uses threads, rather than using multiple processes.
</pre>
<blockquote type="cite">
<pre wrap="">CPU speed is around 2.44 M.
I'm hoping someone has some experience with this issue and can give me advice.
</pre>
</blockquote>
<pre wrap="">
This is what I'd expect for a relay.
Cryptography is expensive.
T
--
Tim Wilson-Brown (teor)
teor2345 at gmail dot com
PGP C855 6CED 5D90 A0C5 29F6 4D43 450C BA7F 968F 094B
ricochet:ekmygaiu4rzgsk6n
xmpp: teor at torproject dot org
------------------------------------------------------------------------
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