Failed to detect CPU frequency if run container (LXC) with fixed CPUs.

[roadk1ll]

Ran into this issue using coro inside of an lxc container when cpu resources of the container were fixed to something other than the first few cores.

When you assign the cpus to the container - they report back sequentially starting at , 0,1,2,3,4...depending on the number of cores assigned to the container ( in the /proc/cpuinfo file.)

However when you get the current_cpu_number = sched_getcpu(), this returns the actual cpu on which the program is running. They don't match up, so cpu-found remains false - and the error below is produced.

see tsc_time.pyx, lines 254-280

import coro
File "/root/traffic_gen/py27/local/lib/python2.7/site-packages/coro/init.py", line 25, in
from coro._coro import *
File "coro/clocks/tsc_time.pxd", line 25, in init coro._coro (coro/_coro.c:58161)
File "coro/clocks/tsc_time.pyx", line 308, in init coro.clocks.tsc_time (coro/clocks/tsc_time.c:15190)
File "coro/clocks/tsc_time.pyx", line 272, in coro.clocks.tsc_time.get_ticks_per_sec (coro/clocks/tsc_time.c:2119)
RuntimeError: failed to detect CPU frequency

[markpeek]

Thank you for the issue. Do you have repeatable steps you can share that show setting up the container and limiting the resources?