On 30 Jun 2017, at 04:52, Arisbe arisbe@cni.net wrote:

I have a small Tor exit relay (VPS) running at +90% CPU capacity.

What version of Tor? Has this only happened recently? Did you upgrade your Tor version? Are you running a caching DNS server?

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.

Have you tried removing this from your torrc?

However, pidstat 5 -p <pid> shows that only 1 CPU is employed. lscpu shows that the VPS is allotted 2 cpus.

2 cores, or hyperthreading on the same core? Do you have any CPU masking options set?

Tor uses threads, rather than using multiple processes.

CPU speed is around 2.44 M.

I'm hoping someone has some experience with this issue and can give me advice.

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 ------------------------------------------------------------------------