[Question] Is the engine meant to be used as a singleton?

[smadurange]

I'm wondering if it's okay to just create instances of the engine as and when I need it or is it meant to be use as a singleton in the application?

[lahma]

Engine is not thread safe so you shouldn't have it as a singleton in multi-threaded application. It's OK to create multiple instances.

[ayende]

To add to that, while the engine isn't thread safe, is is fine (and expected) that you'll reuse the engine to execute scripts multiple times.
This allows you to save on the initialization costs, especially if you want to have some init scripts / environment to offer.

[lahma]

You might also want to keep an eye on #789 as there's probably going to be a default implementation for engine pool.