I thought merb would use a considerably less amount of memory to run than rails, but it turns out it’s pretty close.

My medium sized rails app is using around 40 MB of memory at the moment. My small merb app (a few models and one controller) is using 33 MB. If I remove datamapper and my models, it goes down to 22 MB.

However, the merb process is threaded, so technically I could run with just one and handle as much work as three or four (maybe more?) rails processes, so it’s a win in the end for this particular project I need it for.