is it possible to run multiple blog with one typo process?

is it possible to run multiple blog with one typo process? each rails process takes 30-50MB memory, then several typo blogs takes quite a bit resources. so how to modify typo to run multi blog with minimal changes?

* each blog has own domain or subdomain name. * each blog has own directory for its own DB and theme files. * I know how to overwrite ActiveRecord connection() in a plugin * but I don't know how to handle theme and layout for multi blogs. overwrite layout() and detect domain name?

www.WuyaSea.com

Last time I checked, mephisto had better support for multi blogs.

from reading http://mephisto.stikipad.com/help/show/HostingMultipleSites , it seems that their support for multi site is an afterthought too.