Hi Dario, I just had a peek at the thread dump, and it appear that it was not captured during the frozen period. Is that correct? If captured when the system appears frozen, it will show information about what the threads are doing or waiting for.
Thanks, David On Wed, Apr 13, 2011 at 2:50 AM, Dario Rexin <dario.re...@xing.com> wrote: > Hi Tobias, > > I was already sending requests to the server in the last dump. Here is > another, hopefully this one is more helpful. The longer I request data, the > longer it takes for the server to answer. After some time it frequently > freezes for up to several seconds without answering to any of the requests. > > https://gist.github.com/917283 > > Cheers, > > Dario > > Am 13.04.11 11:14 schrieb "Tobias Ivarsson" unter > <tobias.ivars...@neotechnology.com>: > > > Hi Dario, > > > > This dump looks perfectly fine, the expected threads are there, but they > are > > all idle waiting for work. > > > > When I asked for a thread dump, I wanted one from when the server was > under > > load and you experienced problems. Sorry for not being clear about that. > > > > Cheers, > > Tobias > > > > On Wed, Apr 13, 2011 at 10:34 AM, Dario Rexin <dario.re...@xing.com> > wrote: > > > >> Hey, > >> > >> Somehow my attached files always get deleted. Heres the dump: > >> > >> https://gist.github.com/917199 > >> > >> > >> Cheers, > >> > >> Dario > >> > >> Am 13.04.11 10:30 schrieb "Dario Rexin" unter <dario.re...@xing.com>: > >> > >>> Hi Tobias, > >>> > >>> Here's the thread dump you asked for. Thank you for taking a look at > >> this. > >>> > >>> > >>> Cheers, > >>> > >>> Dario > >>> > >>> > >>> Am 12.04.11 22:16 schrieb "Tobias Ivarsson" unter > >>> <tobias.ivars...@neotechnology.com>: > >>> > >>>> Hi Dario, > >>>> > >>>> Looking at that picture it is indeed clear that a number of threads > are > >>>> waiting for something. What is not shown is the more important > >> information > >>>> about *what* they are waiting for. I would love to get information > like > >> that > >>>> in order to investigate the cause of the performance problem you are > >> seeing. > >>>> If you could send a thread dump instead of a screenshot that would be > a > >> lot > >>>> more useful, since that would contain information about contention > that > >> I > >>>> could actually analyze. The easiest way to get a thread dump is by > >> sending > >>>> the SIGQUIT signal (kill -3) to the JVM process running Neo4j. > >>>> > >>>> Cheers, > >>>> Tobias > >>>> > >>>> On Tue, Apr 12, 2011 at 6:35 PM, Dario Rexin <dario.re...@xing.com> > >> wrote: > >>>> > >>>>> Hi all, > >>>>> > >>>>> Due to huge performance issues with some of our neo queries I > profiled > >> my > >>>>> calls on the neo server. The profiling shows, that up to 85% of the > >> time the > >>>>> threads are waiting for other threads. I don¹t understand what¹s > going > >> on > >>>>> there. Hopefully someone with a deeper knowledge can help me. Am I > >> doing > >>>>> something wrong, or is it normal, that most of the time the threads > are > >>>>> blocking each other? Her is a screenshot, showing the results of my > >>>>> profiling: http://i.imgur.com/eIfam.jpg > >>>>> > >>>>> > >>>>> Thanks in advice, > >>>>> > >>>>> Dario > >>>>> _______________________________________________ > >>>>> Neo4j mailing list > >>>>> User@lists.neo4j.org > >>>>> https://lists.neo4j.org/mailman/listinfo/user > >>>>> > >>>> > >>>> > >> > >> -- > >> Dario Rexin > >> Junior Manager Engineering > >> dario.re...@xing.com > >> > >> XING AG > >> Gaensemarkt 43, 20354 Hamburg, Germany > >> > >> Commercial Reg. (Registergericht): Amtsgericht Hamburg, HRB 98807 > >> Exec. Board (Vorstand): Dr. Stefan Groß-Selbeck (Vorsitzender), Ingo > Chu, > >> Dr. Helmut Becker, Jens Pape > >> Chairman of the Supervisory Board (Aufsichtsratsvorsitzender): Dr. Neil > >> Sunderland > >> > >> Please join my network on XING: > >> https://www.xing.com/profile/Dario_Rexin > >> > >> This e-mail may contain confidential and/or privileged information. If > you > >> are not the intended recipient (or have received this e-mail in error) > >> please notify the sender immediately and destroy this e-mail. Any > >> unauthorised copying, disclosure or distribution of the material in this > >> e-mail is strictly forbidden and may be unlawful. > >> > >> _______________________________________________ > >> Neo4j mailing list > >> User@lists.neo4j.org > >> https://lists.neo4j.org/mailman/listinfo/user > >> > > > > > > -- > Dario Rexin > Junior Manager Engineering > dario.re...@xing.com > > XING AG > Gaensemarkt 43, 20354 Hamburg, Germany > > Commercial Reg. (Registergericht): Amtsgericht Hamburg, HRB 98807 > Exec. Board (Vorstand): Dr. Stefan Groß-Selbeck (Vorsitzender), Ingo Chu, > Dr. Helmut Becker, Jens Pape > Chairman of the Supervisory Board (Aufsichtsratsvorsitzender): Dr. Neil > Sunderland > > Please join my network on XING: > https://www.xing.com/profile/Dario_Rexin > > This e-mail may contain confidential and/or privileged information. If you > are not the intended recipient (or have received this e-mail in error) > please notify the sender immediately and destroy this e-mail. Any > unauthorised copying, disclosure or distribution of the material in this > e-mail is strictly forbidden and may be unlawful. > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > -- David Montag <david.mon...@neotechnology.com> Neo Technology, www.neotechnology.com Cell: 650.556.4411 Skype: ddmontag _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
