Details:

Instiki is a lightweight Ruby on Rails based wiki application.

Version 0.11.0 of Instiki is compatible with the (gs) Grid-Service, however there is one modification that must be made due to the way that Instiki 0.11.0 is packaged.

Instiki comes with a version of Ruby on Rails frozen in the vendor subdirectory. This version opened one database connection per thread, and since Mongrel is multi-threaded, after a few requests, Instiki has opened enough connections to cause the connection limit to be reached. When the connection limit is reached, Instiki begins to show "500 Server Error".

The solution is to disable database concurrency (which is now the default in Rails) by adding the following line to config/environment.rb:

ActiveRecord::Base.allow_concurrency = false

Note that this applies to version 0.11.0 of Instiki. Future versions may not have this issue.

Revisions:

07-20-2009: Minor Fixes