impromptu Rainbows!/Zbatery user survey

James Tucker jftucker at
Thu Jun 17 15:46:35 EDT 2010

On 16 Jun 2010, at 16:08, Eric Wong wrote:

> Eric Wong <normalperson at> wrote:
>> Hi all,
>> Since Rainbows! can be configured so many different ways, I'm
>> wondering about how (or even if :) people use it in production.
> One more question:
> * What proxies, if any, run in front?  Either to distribute
>  load between machines, handle failover for a dead machine, to serve
>  static files, etc...

I do know of a bunch of folks using async Thin in production for relatively high concurrency levels (1-4k open connections) serving through nginx. I personally can't verify the numbers, as the boxes are behind doors to which I don't have keys. I don't know if this info is useful to you.

>> Behind the scenes, I've privately helped some folks deploy a few
>> production apps using ThreadSpawn (REE 2010.01), FiberSpawn
>> (1.9.1-p378), and EventMachine (REE 2010.01).  I can't say more than
>> that due to confidentiality issues, but I suspect WEBrick would've been
>> more than adequate for those applications :)
> _None_ of these are proxied behind nginx.  They only need a load
> balancer to distribute load between multiple machines and to handle
> failover if a box goes down.
> They either use haproxy or a similar, but overpriced black-box[1].  They
> either do pass-through (Layer 4, TCP-only) or only buffer (and possibly
> rewrite) HTTP headers (Layer 7).  I forget which apps used which, but
> Rainbows! works great in all of those configurations.
> [1] not my decision to use it, of course :)
> -- 
> Eric Wong
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