1. Parallel Processing in ROSA II
Glenn Schrader / Sara Siegal
MIT Lincoln Laboratory
09/22/2009
Title page.
This work is sponsored by the Department of the Air Force under Air Force contract FA C Opinions, interpretations, conclusions and recommendations are those of the author and not necessarily endorsed by the United States Government.

2. Typical Parallel System
Parallel Processing
Parallel Processing
Parallel Processing
Inputs
Corner Turn
Corner Turn
Output
Collect
In the standard parallel programming “view of the world” an application consists of processors operating on and exchanging data to solve some problem.
e.g. MPI
Parallel Processing “View of the World”

3. HPEC Within A Larger System
Operator
Interfaces
System
Controller
e.g. DDS**
Sensor &
Controller
Subsystem
Interfaces
HPEC
System
External
System
Interfaces
In a real system a parallel processor is embedded into the system as a component. The parallel processor must interact with the other non-parallel system components in order to perform the system’s function.
Other
Controllers
“Traditional”
ROSA* II Distributed
System
HPEC Systems are usually a component within a larger system. The larger system tends to look more like a “distributed” system rather than a “parallel” system.
*Radar Open System Architecture
**Distributed Data Standard

4. Distributed/Parallel
Approach
This presentation shows results from a case where a LL developed system level middleware and another LL developed HPEC middleware were required to inter-operate
Distributed / parallel component interaction can be implemented via a communication bridge
Testing approach
Interaction between distributed and parallel components is a communication problem
Comm is typically described in terms of latency & bandwidth
Tests measure round-trip latency and max bandwidth
ROSA
Distributed
Component
Distributed/Parallel
Communication Bridge
PVL* Parallel
Components
This poster presentation shows an approach that was developed at LL for connecting a parallel processor into a larger system’s command and control messaging. Some messaging performance test results will also be presented.
*Parallel Vector Library