- 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%.
My problem looks like similar to this [thread](
http://twistedmatrix.com/pipermail/twisted-python/2008-September/018361.html)
but since we have a few sockets in TIME_WAIT state, I don't think that
enable the `tw_recycle` can help. About the `tcp_syncookies`, I don't see
any related message in the syslog.
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
I also have tried to [debug with `gdb`](
https://wiki.python.org/moin/DebuggingWithGdb) but `pystack` returns
nothing.
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