[Yt-dev] proposal: turning off parameter file storage by default

[Sam Skillman]

Hi all,

There have been some recent issues that have popped up when parameter file
storage is used when accessing different parameter files at the same time
in a parallel job.  While the long term solution is to move to something
thread-safe like sqlite, I am of the opinion that for now we should turn
off this capability by default.  We would leave the capability in there,
and it would be turned on with:

from yt.config import ytcfg; ytcfg["yt", "storeparameterfiles"] = "True"

at the very top of a yt script.  Since this could disrupt some people's
workflows, I think a +/-1 would be helpful, along with any strong opinions.

Thanks,
Sam
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