Comment 48 for bug 1178707

Hm, so that middle part looks a bit like Python documentation. Could it be part or a part of phantomjs? Btw, for Lucid/10.04, how is phantomjs obtained? At least it is not a separate package as of Precise/12.04 and later.
I wonder whether any part of that (or something else which is added to the stock instance) makes extensive use of async IO which IIRC is one of the things in the kernel that handles MAP_ANON pages. That alone probably does not explain why some instances have problems with that and others do not, but maybe if that comes together with less memory and/or a certain throughput to storage or network.