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2026 Monitoring
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One of the really nice features of Resque is the web interface that it ships with for monitoring your queues and jobs It can run standalone or be mounted with your Rails application using Rack::URLMap in your app s configru To run standalone, simply run resque-web from the command line If you prefer to mount with your Rails application, modify your configru to add the Resque server
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203 Rails Runner
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require "config/environment" require "resque/server" use Rails::Rack::LogTailer use Rails::Rack::Static run Rack::URLMapnew( "/" => ActionController::Dispatchernew, "/resque" => Resque::Servernew )
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2027 Summary
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Resque is recommended where a large number of jobs are in play with potential unwanted memory growth Completed child jobs release their memory on completing, so longrunning workers do not have the negative effect on system resources that you could potentially have with other frameworks It does not support priority queueing but does support multiple queues is advantageous when jobs can be categorized together and given pools of workers to run them With a Redis backend, Resque does not suffer from the potential database locking issues that can arise when using Delayed Job and has significantly better performance with respect to queue management Do note that Redis stores all of its data in memory, so if you are expecting a large amount of jobs but do not have a significant amount of RAM to spare, you may need to look at a different framework
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203 Rails Runner
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Rails comes with a built-in tool for running tasks independent of the web cycle The rails runner command simply loads the default Rails environment and then executes some specified Ruby code Popular uses include:
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Importing batch external data Executing any (class) method in your models Running intensive calculations, delivering e-mails in batches, or executing scheduled
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tasks Usages involving rails runner that you should avoid at all costs are:
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20: Background Processing
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2031 Getting Started
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For example, let us suppose that you have a model called Report The Report model has a class method called generate_rankings, which you can call from the command line using
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$ rails runner 'Reportgenerate_rankings'
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Since we have access to all of Rails, we can even use the Active Record finder methods to extract data from our application3
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$ rails runner 'Userallmap(&:email)each {|e| puts e }' charlesquinn@highgroovecom me@seebqcom billgates@microsoftcom obie@obiefernandezcom
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This example demonstrates that we have access to the User model and are able to execute arbitrary Rails code In this case, we ve collected some e-mail addresses that we can now spam to our heart s content (Just kidding!)
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2032 Usage Notes
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There are some things to remember when using rails runner You must specify the production environment using the -e option; otherwise, it defaults to development The rails runner help option tells us:
$ rails runner -h Usage: rails runner [options] ('Someruby(code)' or a filename) -e, --environment=name Specifies the environment for the runner to operate in (test/development/ production) Default: development #!/usr/bin/env/path/to/script/railsrunner
Using rails runner, we can easily script any batch operations that need to run using cron or another system scheduler For example, you might calculate the most popular or highest-ranking product in your e-commerce application every few minutes or nightly, rather than make an expensive query on every request:
$ rails runner e production 'Productcalculate_top_ranking'
A sample crontab to run that script might look like
0 */5 * * * root /usr/local/bin/ruby \ /apps/exampledotcom/current/script/rails runner -e production \ 'Productcalculate_top_ranking'
3 Be careful to escape any characters that have specific meaning to your shell
204 Conclusion
The script will run every five hours to update the Product model s top rankings
2033 Considerations
On the positive side, it doesn t get any easier and there are no additional libraries to install That s about it As for negatives the rails runner process loads the entire Rails environment For some tasks, particularly short-lived ones, that can be quite wasteful of resources Also, nothing prevents multiple copies of the same script from running simultaneously, which can be catastrophically bad, depending on the contents of the script Wilson says
Do not process incoming e-mail with rails runner It s a Denial of Service attack waiting to happen Use Fetcher (or something like it) instead: http://slantwisedesigncom/ rdoc/fetcher/
2034 Summary
The Rails Runner is useful for short tasks that need to run infrequently, but jobs that require more heavy lifting, reporting, and robust failover mechanisms are best handled by other libraries