[tor-relays] Status of NumCPUs >2 in 0.2.3.x?

Nick Mathewson nickm at freehaven.net
Mon Nov 5 02:57:48 UTC 2012

On Sun, Nov 4, 2012 at 9:55 PM, Steve Snyder <swsnyder at snydernet.net> wrote:

> In the Tor v0.2.2.x series it was said that it was pointless to set
> NumCPUs to a value greater than 2.  Due to poor scaling, I guess.
> Is that still the case with v0.2.3.24+ ?  Would NumCPUs value of 4 or 8
> (on systems with that many CPU cores) actually provide any benefit over a
> value of 2?

It might help circuit start-up latency a little, but other crypto still
isn't parallelized, so it won't help a ton.  I'd like to have that happen
in 0.2.4, but there are a lot of other features I want for 0.2.4 too, so
we'll have to see whether it gets done in time.  (The feature I want MOST
for 0.2.4 is "comes out on schedule.")

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