Re: [undertow-dev] Unable to concurrently use all available IO Threads under load on Red Hat

Backlog setting is 1000. Is this what you are interested in from netstat? This was for ab with a -c of 50. [barnett@apigateway_test ~]$ java -jar undertow-test-0.1.0-jar-with-dependencies.jar & [1] 7329 [barnett@apigateway_test ~]$ Jul 26, 2018 1:30:22 PM org.xnio.Xnio <clinit> INFO: XNIO version 3.3.8.Final Jul 26, 2018 1:30:23 PM org.xnio.nio.NioXnio <clinit> INFO: XNIO NIO Implementation Version 3.3.8.Final Server started on port 8080 1 2 3 4 [barnett@apigateway_test ~]$ netstat -t | grep apigateway_loadge | grep ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51580 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51614 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51622 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51626 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51612 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51578 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51636 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51616 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51582 ESTABLISHED tcp6 0 0 apigateway_tes:webcache apigateway_loadge:51556 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51588 ESTABLISHED tcp6 0 0 apigateway_tes:webcache apigateway_loadge:51558 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51586 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51648 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51632 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51652 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51654 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51574 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51640 ESTABLISHED tcp6 0 0 apigateway_tes:webcache apigateway_loadge:51564 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51590 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51610 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51594 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51592 ESTABLISHED tcp6 0 0 apigateway_tes:webcache apigateway_loadge:51568 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51620 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51598 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51600 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51584 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51630 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51596 ESTABLISHED tcp6 0 0 apigateway_tes:webcache apigateway_loadge:51566 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51650 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51656 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51624 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51662 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51642 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51604 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51608 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51634 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51658 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51628 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51660 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51572 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51606 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51602 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51638 ESTABLISHED tcp6 0 0 apigateway_tes:webcache apigateway_loadge:51570 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51618 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51646 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51644 ESTABLISHED tcp6 97 0 apigateway_tes:webcache apigateway_loadge:51576 ESTABLISHED On 7/25/2018 9:23 PM, Jason Greene wrote: Could you post a netstat output so we can see what port numbers your host is picking? Also is your backlog setting low by chance? On Jul 25, 2018, at 6:24 PM, Stuart Douglas <sdouglas(a)redhat.com&gt; wrote: The mapping is done by a hash of the remote IP+port. It sounds like maybe this machine is allocating ports in a way that does not map well to our hash. Because the remote IP is the same it is really only the port that comes into effect. The algorithm is in org.xnio.nio.QueuedNioTcpServer#handleReady and in this case would simplify down to: (((C1 * 23) + P) * 23 + C2) % 8 Where C1 is a hash of the remote IP, and C2 is a hash of the local IP+port combo. Stuart On Thu, Jul 26, 2018 at 3:52 AM R. Matt Barnett <barnett(a)rice.edu&gt; wrote: > I did. I set the concurrency level of ab to 128. I still see only 4 > overlaps: > > $ java -jar undertow-test-0.1.0-jar-with-dependencies.jar & > > Server started on port 8080 > 1 > 2 > 3 > 4 > > $ netstat -t | grep apigateway_loadge | grep -c ESTABLISHED > 126 > > > What is the algorithm for mapping connections to IO threads? As a new > Undertow user I had assumed round robin, but it sounds like this is not the > case. > > > -- Matt > > On 7/25/2018 11:49 AM, Bill O'Neil wrote: > > Did you try setting the concurrency level much higher than 8 like I > suggested earlier? You are probably having multiple connections assigned to > the same IO threads. > > On Wed, Jul 25, 2018 at 12:26 PM, R. Matt Barnett <barnett(a)rice.edu&gt; > wrote: > >> Corrected test to resolve test/set race. >> >> >> https://gist.github.com/rmbarnett-rice/1179c4ad1d3344bb247c8b8daed3e4fa >> >> >> I've also discovered this morning that I *can* see 1-8 printed on Red >> Hat when I generate load using ab from Windows, but only 1-4 when >> running ab on Red Hat (both locally and from a remote server). I'm >> wondering if perhaps there is some sort of connection reuse shenanigans >> going on. My assumption of the use of the -c 8 parameter was "make 8 >> sockets" but maybe not. I'll dig in and report back. >> >> >> -- Matt >> >> >> On 7/24/2018 6:56 PM, R. Matt Barnett wrote: >> > Hello, >> > >> > I'm experiencing an Undertow performance issue I fail to understand. I >> > am able to reproduce the issue with the code linked bellow. The problem >> > is that on Red Hat (and not Windows) I'm unable to concurrently process >> > more than 4 overlapping requests even with 8 configured IO Threads. >> > For example, if I run the following program (1 file, 55 lines): >> > >> > >> https://gist.github.com/rmbarnett-rice/668db6b4e9f8f8da7093a3659b6ae2b5 >> > >> > ... on Red Hat and then send requests to the server using Apache >> > Benchmark... >> > >> > > ab -n 1000 -c 8 localhost:8080/ >> > >> > I see the following output from the Undertow process: >> > >> > Server started on port 8080 >> > >> > 1 >> > 2 >> > 3 >> > 4 >> > >> > I believe this demonstrates that only 4 requests are ever processed in >> > parallel. I would expect 8. In fact, when I run the same experiment >> on >> > Windows I see the expected output of >> > >> > Server started on port 8080 >> > 1 >> > 2 >> > 3 >> > 4 >> > 5 >> > 6 >> > 7 >> > 8 >> > >> > Any thoughts as to what might explain this behavior? >> > >> > Best, >> > >> > Matt >> > >> > _______________________________________________ >> > undertow-dev mailing list >> > undertow-dev(a)lists.jboss.org >> > https://lists.jboss.org/mailman/listinfo/undertow-dev >> >> _______________________________________________ >> undertow-dev mailing list >> undertow-dev(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/undertow-dev >> > > > _______________________________________________ > undertow-dev mailing list > undertow-dev(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/undertow-dev _______________________________________________ undertow-dev mailing list undertow-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/undertow-dev