While that is true, this is not the most efficient way to solve the problem if you have a lot of RAM. My point is merely that your laptop can compute PageRank for, roughly, any link graph that will fit on its hard disk, or that it can access at a reasonable speed over the network.
(At 30 links per web page and 5 bytes per link, you need about 160 bytes per web page to represent this link graph. That would allow you to store a 6-billion-page graph on a 1TB notebook hard disk. Unfortunately, making 8 passes over that terabyte will probably take more than a day.)
(At 30 links per web page and 5 bytes per link, you need about 160 bytes per web page to represent this link graph. That would allow you to store a 6-billion-page graph on a 1TB notebook hard disk. Unfortunately, making 8 passes over that terabyte will probably take more than a day.)