Hi Alexey,
probably I do not really understand how grizzly is working,
but this is what I observe: a selector thread has only
one connection in the selector. As a result, only events from a
single connection get processed.
Is it expected behavior?
Tigran.
----- Original Message -----
> From: "Tigran Mkrtchyan" <tigran.mkrtchyan_at_desy.de>
> To: dev_at_grizzly.java.net
> Sent: Monday, March 10, 2014 9:10:07 AM
> Subject: Re: closed connection under high load
>
>
>
> ----- Original Message -----
> > From: "Oleksiy Stashok" <oleksiy.stashok_at_oracle.com>
> > To: dev_at_grizzly.java.net
> > Sent: Friday, March 7, 2014 10:50:15 PM
> > Subject: Re: closed connection under high load
> >
> > Hi Tigran,
> >
> >
> > On 07.03.14 07:36, Mkrtchyan, Tigran wrote:
> > >
> > > It looks like that IO dominated by a single connection.
> > > I monitor three probes: onWriteEvent, onReadEvent and
> > > onIOEventReadyEvent. While I see ACCEPT from all clients,
> > > READ and WRITE comes only from a single client.
> > Looks like your app is made in a way, that it can't use
> > SameThreadStrategy. If you can share your code and prepare the test - I
> > can take a look and try to find out why it doesn't work with the
> > SameThreadStrategy.
>
> Hi Alexey,
>
> the code is available on the github:
>
> https://github.com/kofemann/oncrpc4j
>
> You probably need to have a look at
>
> https://github.com/kofemann/oncrpc4j/blob/master/oncrpc4j-core/src/main/java/org/dcache/xdr/OncRpcSvc.java
>
> and
>
> https://github.com/kofemann/oncrpc4j/blob/master/oncrpc4j-core/src/main/java/org/dcache/xdr/GrizzlyXdrTransport.java
>
> possibly
>
> https://github.com/kofemann/oncrpc4j/blob/master/oncrpc4j-core/src/main/java/org/dcache/xdr/RpcDispatcher.java
>
> I will try to prepare a simple client to produce a load without running full
> NFS server.
>
> Thanks,
> Tigran.
>
> >
> > WBR,
> > Alexey.
> >
> > >
> > > Tigran.
> > >
> > > ----- Original Message -----
> > >> From: "Oleksiy Stashok" <oleksiy.stashok_at_oracle.com>
> > >> To: dev_at_grizzly.java.net
> > >> Sent: Friday, March 7, 2014 2:39:22 AM
> > >> Subject: Re: closed connection under high load
> > >>
> > >>
> > >> On 06.03.14 01:29, Mkrtchyan, Tigran wrote:
> > >>> ----- Original Message -----
> > >>>> From: "Oleksiy Stashok" <oleksiy.stashok_at_oracle.com>
> > >>>> To: dev_at_grizzly.java.net
> > >>>> Sent: Thursday, March 6, 2014 2:35:00 AM
> > >>>> Subject: Re: closed connection under high load
> > >>>>
> > >>>> Hi Tigran,
> > >>>>
> > >>>>>> Hi Tigran,
> > >>>>>>
> > >>>>>> looks like the connection is getting closed because of IOException
> > >>>>>> or
> > >>>>>> -1
> > >>>>>> returned during channel.read(), which is expected.
> > >>>>>> So IMO it's nothing decided by Grizzly, it's either other side or
> > >>>>>> local
> > >>>>>> OS closed the connection.
> > >>>>> Yes, in did, the client closes the connection. But it looks like the
> > >>>>> reason
> > >>>>> of it
> > >>>>> that reply from server sent 15sec after request is arrived. The
> > >>>>> filter
> > >>>>> itself took
> > >>>>> max 800ms. Any ideas how to trace where rest of the time was spent?
> > >>>> You can register ConnectionProbe for each Connection:
> > >>>> / connection.getMonitoringConfig().addProbes(new
> > >>>> ConnectionProbe() {
> > >>>> .....
> > >>>> });/
> > >>>>
> > >>>> and monitor different Connection events and time when it happened.
> > >>>> It might be interesting to monitor onWriteEvent() and see if write
> > >>>> delay
> > >>>> occurs on Grizzly/Java or OS level. For example Grizzly reports the
> > >>>> socketChannel.write(ByteBuffer) had been accepted the ByteBuffer, but
> > >>>> the peer didn't get this data, which means the delay happens in OS
> > >>>> layer.
> > >>> I was logging in my code where I start to process the request and this
> > >>> was with quite a delay. Unfortunately, my work load nodes are turned
> > >>> off till the end of the week as we update cooling infrastructure in our
> > >>> data center. But I will continue investigations next week. Is there any
> > >>> best practice in which relations should be the number of selector and
> > >>> worker threads?
> > >> By default we'd suggest selector-threads-count=CPU-count and
> > >> worker-threads-count=CPU-count*2
> > >> I'd also recommend to use SameThreadStrategy (no worker threads), where
> > >> it's possible. For example if the app logic doesn't have any blocking,
> > >> waiting kind of code - there is no reason to pay for a thread context
> > >> switch.
> > >>
> > >>> BTW, what do you think about proposed change:
> > >>> https://github.com/GrizzlyNIO/grizzly-mirror/pull/1
> > >> Looks good.
> > >> Will apply it.
> > >>
> > >> Thank you!
> > >>
> > >> WBR,
> > >> Alexey.
> > >>
> > >>
> > >>> Tigran.
> > >>>
> > >>>> Thanks.
> > >>>>
> > >>>> WBR,
> > >>>> Alexey.
> > >>>>
> > >>>>> Looking at the requests log I can see that request processing is not
> > >>>>> equally distributed.
> > >>>>> Some connections processed quite active, while others are not. Is
> > >>>>> there
> > >>>>> a
> > >>>>> way how I can see
> > >>>>> selector threads activity?
> > >>>>>
> > >>>>> Tigran.
> > >>>>>
> > >>>>>> Thanks.
> > >>>>>>
> > >>>>>> WBR,
> > >>>>>> Alexey.
> > >>>>>>
> > >>>>>> On 26.02.14 14:06, Mkrtchyan, Tigran wrote:
> > >>>>>>> Hi,
> > >>>>>>>
> > >>>>>>> we observe that grizzly decides to close connection under high
> > >>>>>>> load.
> > >>>>>>> Any idea how to find the reason?
> > >>>>>>>
> > >>>>>>> Thanks,
> > >>>>>>> Tigran.
> > >>>>>>>
> > >>>>>>> java.io.IOException: Connection closed
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.asyncqueue.TaskQueue.onClose(TaskQueue.java:302)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.AbstractNIOAsyncQueueWriter.onClose(AbstractNIOAsyncQueueWriter.java:591)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.transport.TCPNIOTransport.closeConnection(TCPNIOTransport.java:389)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.NIOConnection$2.run(NIOConnection.java:439)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.DefaultSelectorHandler$RunnableTask.run(DefaultSelectorHandler.java:489)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.DefaultSelectorHandler.processPendingTaskQueue(DefaultSelectorHandler.java:295)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.DefaultSelectorHandler.processPendingTasks(DefaultSelectorHandler.java:286)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.DefaultSelectorHandler.preSelect(DefaultSelectorHandler.java:100)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.SelectorRunner.doSelect(SelectorRunner.java:326)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.SelectorRunner.run(SelectorRunner.java:271)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51]
> > >>>>>>> Caused by: java.lang.Exception: Close stack trace
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.NIOConnection.close0(NIOConnection.java:426)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.transport.TCPNIOConnection.close0(TCPNIOConnection.java:292)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.transport.TCPNIOTransport.read(TCPNIOTransport.java:648)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.transport.TCPNIOTransportFilter.handleRead(TCPNIOTransportFilter.java:75)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.filterchain.TransportFilter.handleRead(TransportFilter.java:173)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:546)
> > >>>>>>> [grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>>>>>> at
> > >>>>>>> org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
> > >>>>>>> ~[grizzly-framework-2.3.5.jar:2.3.5]
> > >>
> >
> >
>