23
Requests 
Requests 
from Web 
from Web 
Switch 
Switch 
Coscheulded 
Main 
Main 
Remote 
Remote 
Cache 
Cache 
r 
Recv 
Send 
r 
e 
e 
y 
y 
a 
VIA 
a 
r   L 
r   L 
e s  Disk 
Disk 
e s 
U  Helper 
Coscheulded 
Helper  U 
Remote 
Remote 
Cache 
Cache 
Send 
Recv 
r 
r 
e 
e 
y 
y 
a 
a 
l   L 
Coscheduling Modules 
Coscheduling Modules 
l   L 
e 
e 
Linux Scheduler 
r n 
Linux Scheduler 
r n 
e 
e 
K 
K 
Fig. 3.2. Coscheduled PRESS Model
node, the corresponding process at that node is coscheduled with the hope that both the
sender and receiver are scheduled simultaneously for efficient communication. Thus, in
our model, whenever a remote cache read request arrives at the corresponding send queue
of the remote cache send process, the remote cache send process pushes this request to
the network using VIA and waits (spins) until the response arrives from the service node.
When the request arrives at the service node (actually in the NIC), the corresponding
remote cache recv process is scheduled using the DCS coscheduling policy.
Note that without this coscheduling scheme, in the PRESS model, the remote cache recv
process has to wait until the Linux scheduler assigns the CPU to it. The remote cache recv
process in the service node sends the requested file from its local cache to the initial node
whose remote cache send process is also coscheduled. If there is no jobs to process, the
remote cache recv process returns to the blocking state. After receiving the reply, the












  

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