I believe that the system would work better if the minimum short term debt
were 0 rather than the mean short term debt being 0.  Typically what
happens is that the task that has just completed has a negative STD.  If
this is the last one for the project, many of the tasks with higher STDs
are shifted to have a negative STD.  If the project then is allowed to
download a task immediately (and this does often happen) the project will
then have a STD of 0, effectively bypassing other projects that used to
have a higher STD.

If the minimum STD were kept at 0, this would not happen.  When the lowest
value STD project was removed from the STD, the next lowest value STD
project would then have a value of 0.  This starts all new tasks from
projects at the bottom, and they may have to wait for a while for their
turn.  However, it does mean that projects that have had work on the system
will eventually have the STD be high enough to actually run.

jm7

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