MongoDB Performance when connecting to multiple databases via parent-child connections

When connecting to a mongo server containing multiple dbs, what is more performant approach using node-mongodb-native driver.

Let's say I have 8 dbs(db1...db8) on the same Mongo Server. My node app needs to connect to all 8 depending on the queries received to it. What is a better option here for me

1) Create 8 separate connections (1 with each db)

OR

2) Create one parent connection to the server on test db and then call db.db 8 times to create 8 child connections under that parent. As I read in the doc(http://mongodb.github.io/node-mongodb-native/2.0/api/Db.html#db), all 8 child connections will be running on the same socket

Has anyone researched into this or has some background or thoughts that can help me determine the right course of action?

via tapsboy