- Python 2.7.3
- [twisted, version 13.1.0]
- xen-domU
`atop` shows that `carbon-relay` is eating 80, 90% USRCPU. From the `strace`:
accept(7, {sa_family=AF_INET, sin_port=htons(60649), sin_addr=inet_addr("192.237.222.81")}, [16]) = 257
accept(7, {sa_family=AF_INET, sin_port=htons(51564), sin_addr=inet_addr("166.78.1.48")}, [16]) = 257
accept(7, 0x7ffff4679550, [16]) = -1 EAGAIN (Resource temporarily unavailable)
accept(7, {sa_family=AF_INET, sin_port=htons(33654), sin_addr=inet_addr("198.61.194.248")}, [16]) = 257
accept(7, {sa_family=AF_INET, sin_port=htons(50037), sin_addr=inet_addr("166.78.181.204")}, [16]) = 257
accept(7, 0x7ffff4679550, [16]) = -1 EAGAIN (Resource temporarily unavailable)
The strange thing is: even restart the service, it seems stuck at fd 7 everytime running `strace`. Does it mean this fd is not being cleanup properly?
I have increased the number of open files:
**/proc/2891/limits**
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 15834 15834 processes
Max open files 16384 16384 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 15834 15834 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
then it decreases down to ~ 50%.
This is what I get when trying to start `carbon-relay` in debug mode:
26/11/2013 02:22:14 :: [listener] MetricPickleReceiver connection with
50.56.249.127:48772 lost: Connection to the other side was lost in a non-clean fashion: Connection lost.
26/11/2013 02:22:14 :: [listener] MetricPickleReceiver connection with
198.101.241.101:50672 lost: Connection to the other side was lost in a non-clean fashion: Connection lost.
26/11/2013 02:22:14 :: [listener] MetricPickleReceiver connection with
166.78.2.167:43346 lost: Connection to the other side was lost in a non-clean fashion: Connection lost.
This is from `twisted`:
class ConnectionLost(ConnectionClosed):
"""Connection to the other side was lost in a non-clean fashion"""
def __str__(self):
s = self.__doc__.strip().splitlines()[0]
if self.args:
s = '%s: %s' % (s, ' '.join(self.args))
s = '%s.' % s
return s