Comments on: Phusion Passenger, now with Global Queuing

By: Ta-da List on Rails 2.2, Passenger And EC2 | Castup

Ta-da List on Rails 2.2, Passenger And EC2 | Castup — Mon, 29 Dec 2008 16:52:17 +0000

[...] we comissioned Phusion to add global queueing to Passenger, we felt it was time to give it a try. Since we were already on Apache, it proved a simple [...]

By: Phusion Passenger 2.0.5 released; mentioned on live.37signals.com « Phusion Corporate Blog

Fri, 05 Dec 2008 13:12:07 +0000

[...] global queuing feature that was introduced in version 2.0.4 was found to cause deadlocks when used in combination [...]

By: InVisible Blog » Hosting fun

InVisible Blog » Hosting fun — Thu, 04 Dec 2008 19:47:30 +0000

[...] rails app had been running for weeks without problems. I installed mod_rails 2.0.4, enabled the global queue feature and have been watching the server all day. So far everything seems fine, but we’ll have to [...]

By: Phusion Passenger 2.0.4 released; 37signals’s Ta-da List now using Passenger « Phusion Corporate Blog

Mon, 01 Dec 2008 21:21:58 +0000

[...] recently announced that we’ve developed a feature called global queuing. This feature was requested by [...]

By: Paul Smith

Paul Smith — Mon, 01 Dec 2008 17:40:56 +0000

Awesome! Thanks for answering so quickly, and great job on passenger!

By: Ninh Bui

Ninh Bui — Fri, 28 Nov 2008 14:23:33 +0000

@Paul Smith:
No, not significantly thanks to copy-on-write semantics. Passenger in conjunction with Ruby Enterprise Edition act kind of like a threaded set-up in the sense that as much memory as possible is being shared across the processes: only when observable side effects occur through write operations, the memory will get copied (i.e. copied-on-write). In any other case, the memory can be shared, and in particular this means Rails framework code etc…

By: Paul Smith

Paul Smith — Fri, 28 Nov 2008 14:14:31 +0000

Memory usage would be lower right? I’m mostly wondering if that would help alleviate the problem that global queuing resolves? I’m guessing not. Thanks for replying so quickly

By: hongli

hongli — Fri, 28 Nov 2008 10:48:38 +0000

@Paul Smith: It is possible, yes. But as far as Phusion Passenger is concerned, there aren’t many advantages to using threads compared to using processes, as it does now.

By: Paul Smith

Paul Smith — Fri, 28 Nov 2008 05:31:37 +0000

With the introduction of Rails 2.2 thread safety would this help eleviate the problem? So you could have multiple requests come in on one process? I don’t think Passenger supports thread safety but that would be cool, and it might help out with this problem. I’m no expert on thread safety or anything like that so I’d love to hear what you guys have to say about it!

By: hongli

hongli — Sun, 16 Nov 2008 13:39:13 +0000

@mml It’ll be included in the next release.