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[tor-bugs] #8002 [Tor]: Mis-count of CPUs
#8002: Mis-count of CPUs
-------------------------+--------------------------------------------------
Reporter: tmpname0901 | Owner:
Type: defect | Status: new
Priority: normal | Milestone: Tor: 0.2.3.x-final
Component: Tor | Version: Tor: 0.2.3.25
Keywords: SMP | Parent:
Points: | Actualpoints:
-------------------------+--------------------------------------------------
On start-up Tor v0.2.3.25/Linux says:
"[notice] Wow! I detected that you have 64 CPUs. I will not autodetect
any more than 16, though. If you want to configure more, set NumCPUs in
your torrc"
This is in a CentOS6/OpenVZ VPS with only a single virtual CPU. Tor
config param NumCPUs is not used.
It turns out that OpenVZ, since version rhel6/042stab061.2, lists all the
*host* CPUs in /sys/devices/system/cpu/. It is this number of processors
that is returned by the sysconf(_SC_NPROCESSORS_CONF) that Tor uses in
~/tor-0.2.3.25/src/common/compat.c to determine CPU count.
From the command line:
# getconf _NPROCESSORS_ONLN
1
Programmatically:
$ /tmp/main
sysconf() says: 64
Wow, too many CPUs: 64
I know that there's not much you can do about a sysconf() that lies. I
want to get this on the record, though, for the sake of Tor's future auto-
scaling.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8002>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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