On 22 jun, 19:58, Mark Hahn <m...@hahnca.com> wrote: > Node sounds like a fit to me. > > Why do you have workers? Doesn't rails automatically use threads/processes > to allow multiple things to happen at once? (I know nothing about how a > rails server works). >
On the contrary, Ryan used rails as an example of way node should exists, rails is single threaded. The why to rails can only answer one request at a time. The way rails is scaled is by starting/forking more servers, if your app uses 40MB in memory, and you can answer a request every 200ms you can handle 5 clients per second, so if you want responses you need more rails servers running(forked) 30 instances will answer to 150 concurrent request per second but will use 1.2 GB of ram. Also scaling with rails involve caching parts of the serve html so the app gets out of the way and lets the native servers (apache which is threaded or ngingx which is evented) handle serving the cached asset or peace of html. Any interaction with anything that can block (talking to an external service) will block that instance for all clients so if a client if sending several emails in one request, other clients cant be served by rails until the process ends. That is way background processes are used, you put the data in a queue(redis for example) for inter process communication and you have another instance of rails which usually doesnt do anything but process the background jobs pick up the data and do the jobs, that instance if usually performing a time based loop waiting for anything to appear in the queue. So trying to integrate rails with for example, an external web service or evented telephony is a REAL PAIN. -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
