how much memory a page is useing?

[thehigherentity]

I know there is a standard memory limmit of 8 in php and i know it can be changed in the ini file

but is there a way to see how much memory a page is useing?

I am loading up a lot of info from a text file and just to see how much i could load i loadedup the file with information until i got the memory error. but it would be nice to have some way of knowing how close you are to the limmit when making a site

also if this is posible i would like to make somthing that stops it from readin the file befor it hits the limmit.

has anyone every done this and how did they go about it?