On Thu, 3 May 2007, Marc G. Fournier wrote:
'k, all I'm looking at right now is the Unix Domain Sockets, and the output
of netstat -> sockstat is growing since I first started counting both ..
This was shortly after reboot:
mars# netstat -A | grep stream | wc -l ; sockstat -u | wc -l
2705
2981
- From your explanation above, I'm guessing that the higher sockstat #s is where
you were talking about one socket being used by multiple processes? But, right
now:
mars# netstat -nA | grep stream | wc -l ; sockstat -u | wc -l
5025
2905
sockstat -u #s are *down*, but netstat -na is almost double ...
Again, based on what you state above: "Sockets can also exist without any
referencing process (if the application closes, but there is still data
draining on an open socket)."
Now, looking at another 6-STABLE server, but one that has been running for 2
months now, I'm seeing numbers more consistent with what mars looks like
shortly after all the jails start up:
venus# netstat -nA | grep stream | wc -l ; sockstat -u | wc -l
2126
2209
So, if those sockets on mars are 'still draining on an open socket', is
there some way of finding out where? If I'm understanding what you've said
above, these 'draining sockets' don't have any processes associated with
them anymore? So, its not like I can just kill off a process, correct?
The draining state cannot occur for UNIX domain sockets. The only cases I
know of in which UNIX domain sockets can have PCBs without a process
connection is if the UNIX domain socket is attached to a socket that is being
passed over another socket where the original socket has released all other
references to it, and in using FIFOs. The former is a relatively rare
occurence with almost all applications, since very few use explicit file
descriptor passing. Is there any chance that any of your applications is
using a large number of POSIX FIFOs?
BTW, when using sockstat as above, you need to sockstat -u | grep -c stream,
for the same reason you do it with netstat. Datagram UNIX domain sockets are
quite frequently used -- for example, with syslog, so need to be omitted from
the count if you are comparing only stream sockets.
Robert N M Watson
Computer Laboratory
University of Cambridge
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