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Support for Illumos/Solaris OS #181

hadret opened this Issue Oct 11, 2017 · 1 comment


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hadret commented Oct 11, 2017


first of all, many thanks for an awesome module. It works flawlessly on Linux so I wanted to try it out on different OS (SmartOS in particular, which is distribution of Illumos that derives from OpenSolaris). Long story short, the module doesn't work that well with different connection processing methods (on Linux it defaults to epoll). I tried two (/dev/poll & eventport) and ended up with two different issues:

  1. /dev/poll was draining CPU to the point where machine was no longer usable.
  2. eventport was cool with CPU, but connections were hanging and after a while it was no longer capable of serving any traffic whatsoever (likely pool of connections was drained).

Because SmartOS derives from Solaris world it shared most of its good and not-so-good parts. eventport is strongly discouraged by nginx (via connection processing methods documentation) and that's too bad as I had high hopes it will actually work (there's even some patch for nginx to fix its behavior when eventport is in use, but it didn't help in this case).

The good part though is that I could use dtrace to see what is actually happening under the hood. The best results I had were achieved whenever I was running nginx with single worker process as it was taking much more time for draining CPU or running out of connections. I'm sharing my findings via flamegraphs (more about concept can be found on Brendan Gregg's website):

/dev/poll (devpoll):

eventport (start and 10m in while running):

healthy instance for comparison (i.e. upsync module disabled):

I realize that SmartOS is rather niche in the market, but I was hoping that maybe the problem is not that big of a deal and could be easily fixed.

Many thanks for your great work!


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hadret commented Feb 6, 2018

I guess there won't be enough interest in this one... Too bad.

@hadret hadret closed this Feb 6, 2018

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