As we have seen in Chapter 7 the agent needs some
information from the SeD to make an optimal scheduling. This
information is a performance prediction of the SeD. The agent will ask
the SeD to fill the data structure defined in Chapter 7
with the information it needs. The SeD returns the information and the
agent can make the scheduling.
Performance prediction can be based
on hardware information, the charge of the SeD (the charge of the CPU,
of the memory,...) or an advanced performance prediction can combine
a set of basic performance predictions. It is possible to use FAST in
the plug-in scheduler to obtain advanced performance predictions. A
second possibility to get performance prediction, called CoRI, is now
available. The aim of CoRI is to simplify the access to the
information. Inside of CoRI, FAST can be called, but it is only one
source of information among other sources (for example Cori-Easy).
FAST is described in Section 8.2, CoRI is described in
Section 8.3.
The default compiling is without FAST and
without CoRI. Note that if you compile with batch enabled, then CoRI
is also enabled. In the table 8.1 you can see which
information is available with each compiling option.