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Re: [Assp-test] Socket poll cycle
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From: Colin <col...@gm...> - 2015-01-28 10:01:35
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On 28/01/2015 09:48, Thomas Eckardt wrote: >> I was mainly asking about tracking down why connections are going > unanswered by ASSP > > > unanswered ? Yes, I have been dealing with a large mail provider investigating why there are delays on emails inbound to us. They have provided me with logs showing no response to their connections. I set iptables to log every SYN packet to port 25 so I have a record of every inbound connection. I see SYN packets logged that match the time of the logs from this provider. The ASSP logs show no evidence of an inbound connection within five minutes each side of the time logged by iptables. There are no connection debug logfiles written to the debug directory relating to it either. >> Warning: the operating system socket poll cycle has taken >> 3.10847902297974 seconds - this is very much is too long > This is only a warning. It tells you, that it has taken a long time > (typical are 0.01 to 1 seconds - accepted are up to 3.0 seconds) to query > the OS for the state of the current connected sockets - nothing else. The > OS has answered and everything is running well. > > btw. you see this warning (only), because 'ConnectionLog' is higher than > standard. > > Thomas > Thanks for the explanation, the logging setting is high because of trying to track down where these connections are going missing. If this isn't related to the missing connections then I have no evidence at all of where to start looking. I suspect that it isn't related as the timing doesn't coincide and this is logged far less frequently than the missing connections issue occurs. > > > > Von: cw <col...@gm...> > An: ASSP development mailing list <ass...@li...> > Datum: 28.01.2015 09:11 > Betreff: Re: [Assp-test] Socket poll cycle > > > > Thanks for the reply, > > I was mainly asking about tracking down why connections are going > unanswered by ASSP when the OS has already seen them and iptables has > logged them. I have connection debug set to highest and nothing shows up > relating to these connections. > > Is there any condition under which ASSP will hit a limit and not log > message stating so? > > The socket poll logs were something I saw in the logs maybe 20 times a day > whilst trying to find something relating to the first issue. Most of the > socket poll logs come from workers not the main thread and the system load > is quite low. > > CPU usage is less than 20% at peak and the load only gets up to 3 on an 8 > core CPU which is a little over 25%. I did increase to 12 cores to see if > extra power would help but it didn't. > On 28 Jan 2015 06:05, "Thomas Eckardt" <Tho...@th...> wrote: > >>> Warning: the operating system socket poll cycle >> Like stated - the call to an OS function - in this case socket->poll - > has >> too long. This may happen - but sould not happen too often. >> It could be caused, if the core where the MainThread is running on, is >> used extensive at the moment or the complete system is under havy load > for >> some seconds. >> There is nothing you do to track this down in assp >> >> Thomas >> >> >> >> Von: Colin <col...@gm...> >> An: ASSP development mailing list <ass...@li...> >> Datum: 27.01.2015 19:50 >> Betreff: [Assp-test] Socket poll cycle >> >> >> >> Hi, >> >> I've been trying to track down some performance issues lately. The load >> and CPU on the server is quite low so we have plenty of resources but I >> see this in the logs every day: >> >> Warning: the operating system socket poll cycle has taken >> 3.10847902297974 seconds - this is very much is too long >> >> I'm also seeing iptables log incoming syn packets on port 25 that never >> get answered by ASSP and there is no evidence of them in the logs. I'm >> presuming there must be a configuration issue or something that can be >> optimised within ASSP to track this down but I've not been able to find >> anything appropriate. >> >> Thanks for suggestions, >> Colin. >> >> >> >> > ------------------------------------------------------------------------------ >> Dive into the World of Parallel Programming. The Go Parallel Website, >> sponsored by Intel and developed in partnership with Slashdot Media, is >> your >> hub for all things parallel software development, from weekly thought >> leadership blogs to news, videos, case studies, tutorials and more. Take > a >> look and join the conversation now. http://goparallel.sourceforge.net/ >> _______________________________________________ >> Assp-test mailing list >> Ass...@li... >> https://lists.sourceforge.net/lists/listinfo/assp-test >> >> >> >> >> DISCLAIMER: >> ******************************************************* >> This email and any files transmitted with it may be confidential, > legally >> privileged and protected in law and are intended solely for the use of > the >> individual to whom it is addressed. >> This email was multiple times scanned for viruses. There should be no >> known virus in this email! >> ******************************************************* >> >> >> > ------------------------------------------------------------------------------ >> Dive into the World of Parallel Programming. The Go Parallel Website, >> sponsored by Intel and developed in partnership with Slashdot Media, is >> your >> hub for all things parallel software development, from weekly thought >> leadership blogs to news, videos, case studies, tutorials and more. Take > a >> look and join the conversation now. http://goparallel.sourceforge.net/ >> _______________________________________________ >> Assp-test mailing list >> Ass...@li... >> https://lists.sourceforge.net/lists/listinfo/assp-test >> > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming. The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is > your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net/ > _______________________________________________ > Assp-test mailing list > Ass...@li... > https://lists.sourceforge.net/lists/listinfo/assp-test > > > > > DISCLAIMER: > ******************************************************* > This email and any files transmitted with it may be confidential, legally > privileged and protected in law and are intended solely for the use of the > > individual to whom it is addressed. > This email was multiple times scanned for viruses. There should be no > known virus in this email! > ******************************************************* > > ------------------------------------------------------------------------------ > Dive into the World of Parallel Programming. The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net/ > _______________________________________________ > Assp-test mailing list > Ass...@li... > https://lists.sourceforge.net/lists/listinfo/assp-test |