# SCGI and Concurrency **URL:** \ **Category:** Rails\ **Created:** [December 10, 2005, 12:44am UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071 "2005-12-10T00:44:55Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![lists](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/cdc98d/32.png) [@lists](https://www.ruby-forum.com/u/lists)\ **Post date:** [December 10, 2005, 12:44am UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071/1 "2005-12-10T00:44:55Z")
A potentially dumb SCGI question here… I am trying out SCGI. It’s a great departure from the complexity of FastCGI. Anyway, with FCGI I am used to seeing multiple dispatcher.fcgi processes in my ‘ps aux’ output. With SCGI I see only a single entry. I assume then that SCGI is doing internal threading instead of process forking? The only thing that threw me is that with FCGI I would see multiple database connections open and I only see a single connection with my SCGI setup. Did I miss a flag to have multiple listeners? Looking at the doco, I didn’t see anything. If anyone has any info, it is appreciated. Cheers. ---
**Author:** ![lists](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/cdc98d/32.png) [@lists](https://www.ruby-forum.com/u/lists)\ **Post date:** [December 10, 2005, 2:34am UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071/2 "2005-12-10T02:34:59Z")
Hi ! 2005/12/9, Hunter’s Lists [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > A potentially dumb SCGI question here… Nope, never. What you want is an SCGI cluster. Works mostly the same way, except you replace scgi\_ctrl with scgi\_cluster. Configuration example: scgi\_cluster config -c 3 -e production -p 2049 -h 127.0.0.1 Configure 3 children (-c 3) in production environment (-e production), listening on consecutive ports starting at 2049 (-p 2049), and bind only on 127.0.0.1 (-h 127.0.0.1). Then, you start the cluster like this: scgi\_cluster start Hope that helps ! ---
**Author:** ![lists](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/cdc98d/32.png) [@lists](https://www.ruby-forum.com/u/lists)\ **Post date:** [December 10, 2005, 3:36am UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071/3 "2005-12-10T03:36:22Z")
Excellent! I did see that in the documentation. Now, on to my next question - do I have to change my Apache 2 config? I have a single SCGIMount directive: SCGIMount / 127.0.0.1:9999 Do I need to do anything to tell Apache to hand off to the extra instances? Thanks again, Hunter > From: Francois B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > Reply-To: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > Date: Fri, 9 Dec 2005 20:33:05 -0500 > To: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > Subject: Re: [Rails] SCGI and Concurrency > > Hi ! 2005/12/9, Hunter’s Lists [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > A potentially > dumb SCGI question here… Nope, never. What you want is an SCGI > cluster. Works mostly the same way, except you replace scgi\_ctrl with > scgi\_cluster. Configuration example: scgi\_cluster config -c 3 -e production > -p 2049 -h 127.0.0.1 Configure 3 children (-c 3) in production environment > (-e production), > listening on consecutive ports starting at 2049 (-p 2049), > and bind > only on 127.0.0.1 (-h 127.0.0.1). Then, you start the cluster like > this: > scgi\_cluster start ## Hope that helps ! François > Beausoleil > [http://blog.teksol.info/](http://blog.teksol.info/) ---
**Author:** ![lists](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/cdc98d/32.png) [@lists](https://www.ruby-forum.com/u/lists)\ **Post date:** [December 10, 2005, 4:49am UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071/4 "2005-12-10T04:49:54Z")
Hi ! 2005/12/9, Hunter’s Lists [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Now, on to my next question - do I have to change my Apache 2 config? Eh, I have the same problem. Seems Apache does not play well with SCGI clusters… See the thread entitled “SCGI cluster configuration example for Apache”. I can’t provide you with a link, unfortunately, because I can’t find it in the gmane archive… There were two solutions in there. Haven’t tried any of them yet. Bye ! ---
**Author:** ![lists](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/cdc98d/32.png) [@lists](https://www.ruby-forum.com/u/lists)\ **Post date:** [December 10, 2005, 11:07pm UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071/5 "2005-12-10T23:07:59Z")
Yeah, I can’t find the thread either… Does anyone have a link? > From: Francois B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > Reply-To: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > Date: Fri, 9 Dec 2005 22:46:18 -0500 > To: [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > Subject: Re: [Rails] SCGI and Concurrency > > Hi ! 2005/12/9, Hunter’s Lists [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Now, on to my > next question - do I have to change my Apache 2 config? Eh, I have the same > problem. Seems Apache does not play well with > SCGI clusters… See the > thread entitled “SCGI cluster configuration > example for Apache”. I can’t > provide you with a link, unfortunately, > because I can’t find it in the gmane > archive… There were two solutions in there. Haven’t tried any of them > yet. ## Bye ! François Beausoleil [http://blog.teksol.info/](http://blog.teksol.info/) ---
**Author:** ![lists](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/cdc98d/32.png) [@lists](https://www.ruby-forum.com/u/lists)\ **Post date:** [December 11, 2005, 9:24am UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071/6 "2005-12-11T09:24:37Z")
2005/12/10, Hunter’s Lists [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > Yeah, I can’t find the thread either… > > Does anyone have a link? Here it is : [http://article.gmane.org/gmane.comp.lang.ruby.rails/33836](http://article.gmane.org/gmane.comp.lang.ruby.rails/33836) ---
**Author:** ![lists](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/cdc98d/32.png) [@lists](https://www.ruby-forum.com/u/lists)\ **Post date:** [December 11, 2005, 9:57pm UTC](https://www.ruby-forum.com/t/scgi-and-concurrency/97071/7 "2005-12-11T21:57:13Z")
Thanks. So, is anyone using this method or using an SCGI cluster with Apache 2? Does this uber hack work? Hunter