issue376 introduced a 50MB soft limit on memory to get the python process to
consume less memory.
On my computer this leads to a bug where the portfolio starts a config which
almost instantly runs out of memory and terminates. This happens only when there
is no external memory limit, because in this case the soft limit is never
changed and remains at 50MB.
My suggestion is to change the preexec_fn of the subprocess call in portfolio.py
to explicitly set the hard and soft limit to -1 (unlimited) in cases where no
external hardlimit was set.
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