Jeremy Evans <[email protected]> wrote:
> On Sat, Nov 20, 2010 at 8:05 PM, Eric Wong <[email protected]> wrote:
> > Michael Guterl <[email protected]> wrote:
> >> We've been using Unicorn 1.x very successfully for some time with a
> >> Rails 2.3 application.  Would you recommend upgrading to Unicorn 3.x?
> >
> > Yes if you're running a recent Linux (>= 2.6.28), it might help somewhat
> > with performance (but may not be noticeable with a particular app).
> > I haven't done extensive benchmarking, but the reduction of syscalls
> > should help a bit, and newer versions will exploit some of that more.
<snip>
> > If you're willing to help iron out portability bugs to other kernels,
> > then please upgrade and report back :)
> 
> Just an anecdotal data point here, using OpenBSD-current.  Moving from
> Unicorn 1.0 to 2.0 sped up the scaffolding_extensions integration test
> suite by a factor of 3 (~10 seconds to ~3 seconds).  I'm guessing this
> is due mainly to the use of kgio.  Hoping to upgrade to Unicorn 3.0
> today.

Wow!  I didn't expect that kind of performance improvement![1]  What
is this test doing?  I'm actually suspicious there could be a bug
somewhere in Unicorn or kgio causing wrong results :)

Let us know how 3.0 goes, thanks!

[1] - dalli reported 10-20%, which is closer to what I expected
      (1-10%).

-- 
Eric Wong
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