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When a particular submission requires multiple files,
it may be that
some are accepted, while some are missing or rejected.
This leaves the system with a
partial submission.
Rather than require the user to send all files
again, the files are kept temporarily in a directory
under /tmp, until the user can send the remaining files.
When the submission is completed, these files
are moved to the instructor's submission area. However,
since there is no guarantee that the
user will eventually complete the submission, these
files must eventually be expired and removed.
These parameters control this process.
The PC_AGELIMIT is an age in seconds after which files are
considered old and removed. The PC_NUMLIMIT is the maximum number of
files which can be stored in the persist area. When adding a new file
would take the set over this limit, the oldest file is removed,
even if it is younger than PC_AGELIMIT.
Note that the contents of the persistent cache are expired only
when a file is to be added, so files may get much older than
PC_AGELIMIT. If a user attempts to complete a
partial submission from which some correct files have expired,
the expired files will have to be sent again, and the user will
receive a message to this effect.
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