On 2013-10-19 03:50, I wrote:
Is there any utility in the very cheap VPSs with 128mb of ram?
I did some testing quite a while ago and found that 256MB was the minimum amount of RAM for a relay. It works for some time with 128MB, but it then runs out of memory, and it is not very good to have it restart all the time.
I say "was" because currently, with more than 3 million clients in the network, a relay might even run out of memory with 256MB RAM. I don't have any current data on that though.