Multiple websites one CI base

[eluser]Matthew Lanham[/eluser]
Hey all,

I just wanted to ask a quick question before i spend some time messing with open_basedir to make this work, i'd like to put CI somewhere on my server for example /usr/local/CI-1.7/ and then just reference to the files in that location for all websites on that server, this would also make it much easier when an update was made to CI as i could keep back dated versions, let me know if you've tried this or if it would be possible, i'm not sure whether if 20 websites all used the same file at the same time if this would cause any IO problems???

Cheers for your help in advance..