24
remote cache send process services the next request. The remote cache send process is
blocked when there is no request in the queue.
(a) PRESS model
(b) Coscheduled PRESS Model
Fig. 3.3. Flow Diagram for remote cache read Requests
Figure 3.3 (a) and (b) show the flow diagrams of the PRESS and the coscheduled
PRESS models in handling a remote cache read request, respectively. In both the figures,
the sequence of steps is given since the arrival of a request from the webswitch at the
initial node (step 1). Once the main process determines that the request needs a remote
cache access, the following 14 steps in the PRESS model and 9 steps in the coscheduled
PRESS model are depicted in the figures. As seen in the figures, a remote request in
PRESS requires several additional context switches between the main and send/receive
processes compared to that in the coscheduled PRESS model. In addition to the DCS












  

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