also stores previous mapping info in the lock file for debugging/data
collection. max_retries for reswap is also set high so we pretty much
go until some vnode gets mapped one-to-one and if that does not track
real-time, the experiment fails. There are also a couple of sleep
statements with times determined empirically so there is a chance for
as many pnodes to report ``violation'' as possible. All these changes
are for the ''doubling vnode weights'' method of sim auto-adaptation.