From: Stan Hu <firstname.lastname@example.org> To: email@example.com Subject: Sustained queuing on one listener can block requests from other listeners Date: Tue, 14 Apr 2020 22:06:15 -0700 [thread overview] Message-ID: <CAMBWrQ=Yh42MPtzJCEO7XryVknDNetRMuA87irWfqVuLdJmiBQ@mail.gmail.com> (raw) My unicorn.rb has two listeners: listen "127.0.0.1:8080", :tcp_nopush => false listen "/var/run/unicorn.socket", :backlog => 1024 We found that because of the greedy attempt to accept new connections before calling select() in https://github.com/defunkt/unicorn/blob/981f561a726bb4307d01e4a09a308edba8d69fe3/lib/unicorn/http_server.rb#L707-L714, listeners on another socket stall out until the first listener is drained. We would expect Unicorn to round-robin between the two listeners, but that doesn't happen as long as there is work to be done for the first listener. We've verified that deleting that `redo` block fixes the problem. What do you think about the various options? 1. Only running that redo block if there is one listener 2. Removing the redo block entirely
next reply other threads:[~2020-04-15 5:06 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-15 5:06 Stan Hu [this message] 2020-04-15 5:26 ` Eric Wong 2020-04-16 5:46 ` Stan Hu 2020-04-16 6:59 ` Eric Wong 2020-04-16 7:24 ` Stan Hu 2020-04-16 9:24 ` [PATCH] prevent single listener from monopolizing a worker Eric Wong
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