I just did 1 billion digits, it took 1137 seconds and the mem count went from 5.75 gb to just over 7 gb however it did peak at over 12 gb at some point, so maybe 8 gb is a tad too little. the file created was just over 1 gb in size and is available here if you want to down load it. It is a txt file and will have a load of "/" line separators in it, so you will need to edit those out. The longest part was writing it to file and uploading it. From start to finish was an hour to get it into dropbox.
https://www.dropbox.com/s/fasudetu4vczho7/pibillion.txt?dl=0
Regards.
