[ANN] unicorn 3.0.0 - disable rewindable input!

[ANN] unicorn 3.0.0 - disable rewindable input!

[Eric Wong]

Changes:

Rewindable "rack.input" may be disabled via the
"rewindable_input false" directive in the configuration file.
This will violate Rack::Lint for Rack 1.x applications, but can
reduce I/O for applications that do not need a rewindable
input.

This release updates us to the Kgio 2.x series which should play
more nicely with other libraries and applications.  There are
also internal cleanups and improvements for future versions of
Rainbows!

The Unicorn 3.x series supercedes the 2.x series
while the 1.x series will remain supported indefinitely.

* http://unicorn.bogomips.org/
* mongrel-unicorn@rubyforge.org
* git://git.bogomips.org/unicorn.git

-- 
Eric Wong
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Re: [ANN] unicorn 3.0.0 - disable rewindable input!

[Michael Guterl]

On Fri, Nov 19, 2010 at 9:47 PM, Eric Wong <normalperson@yhbt.net> wrote:
> Changes:
>
> Rewindable "rack.input" may be disabled via the
> "rewindable_input false" directive in the configuration file.
> This will violate Rack::Lint for Rack 1.x applications, but can
> reduce I/O for applications that do not need a rewindable
> input.
>
> This release updates us to the Kgio 2.x series which should play
> more nicely with other libraries and applications.  There are
> also internal cleanups and improvements for future versions of
> Rainbows!
>
> The Unicorn 3.x series supercedes the 2.x series
> while the 1.x series will remain supported indefinitely.
>
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?

Best,
Michael Guterl
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Re: [ANN] unicorn 3.0.0 - disable rewindable input!

[Eric Wong]

Michael Guterl <mguterl@gmail.com> 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.

I don't expect (m)any regressions on recent Linux, and any will be found
and fixed quickly (usually within 24-48 hours).

If you're willing to help iron out portability bugs to other kernels,
then please upgrade and report back :)


On the other hand, if you're going to be losing a lot of
money/users/lives in case of failure, stick to what works for you :)

-- 
Eric Wong
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Re: [ANN] unicorn 3.0.0 - disable rewindable input!

[Jeremy Evans]

On Sat, Nov 20, 2010 at 8:05 PM, Eric Wong <normalperson@yhbt.net> wrote:
> Michael Guterl <mguterl@gmail.com> 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.
>
> I don't expect (m)any regressions on recent Linux, and any will be found
> and fixed quickly (usually within 24-48 hours).
>
> If you're willing to help iron out portability bugs to other kernels,
> then please upgrade and report back :)
>
>
> On the other hand, if you're going to be losing a lot of
> money/users/lives in case of failure, stick to what works for you :)

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.

Jeremy
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Re: [ANN] unicorn 3.0.0 - disable rewindable input!

[Eric Wong]

Jeremy Evans <jeremyevans0@gmail.com> wrote:
> On Sat, Nov 20, 2010 at 8:05 PM, Eric Wong <normalperson@yhbt.net> wrote:
> > Michael Guterl <mguterl@gmail.com> 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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Re: [ANN] unicorn 3.0.0 - disable rewindable input!

[Jeremy Evans]

On Sun, Nov 21, 2010 at 3:49 PM, Eric Wong <normalperson@yhbt.net> wrote:
> Jeremy Evans <jeremyevans0@gmail.com> wrote:
>> On Sat, Nov 20, 2010 at 8:05 PM, Eric Wong <normalperson@yhbt.net> wrote:
>> > Michael Guterl <mguterl@gmail.com> 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%).

Looks like it must have been some other change that caused this speed
up, as after testing again with 1.x, I'm getting about the same in
terms of performance.  Sorry for the misinformation.

Jeremy
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Re: [ANN] unicorn 3.0.0 - disable rewindable input!

[Michael Guterl]

On Sat, Nov 20, 2010 at 11:05 PM, Eric Wong <normalperson@yhbt.net> wrote:
> Michael Guterl <mguterl@gmail.com> 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.
>
> I don't expect (m)any regressions on recent Linux, and any will be found
> and fixed quickly (usually within 24-48 hours).
>
> If you're willing to help iron out portability bugs to other kernels,
> then please upgrade and report back :)
>
>
> On the other hand, if you're going to be losing a lot of
> money/users/lives in case of failure, stick to what works for you :)

Thanks Eric, we'll probably stick with 1.x for the time being.
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