Abstract: We describe the design of a lightweight library using MPI to support stream-processing on acyclic process structures. The design can be used to connect together arbitrary modules where each module can be its own parallel MPI program. We make extensive use of MPI groups and communicators to increase the flexibility of the library, and to make the library easier and safer to use. The notion of a communication context in MPI ensures that libraries do not conflict where a message from one library is mistakenly received by another. The library is not required to be part of any larger workflow environment and is compatible with existing MPI execution environments. The library is part of MarketMiner, a system for executing financial workflows.

Abstract: A link quality agent running in a computer embedded in a device, such as an optical communication transceiver, to monitor an optical signal quality of the link. In one embodiment, avalanche photodiode (APD) and filter wheel values on each side of the free space link as well as packet errors from a distribution switch are monitored. When the link quality agent determines that the free space link is marginal (based on the monitored optical signal quality), the link quality agent configures down the port between the distribution switch and the router on the receive end of the free space link, and forces customer traffic over a backup link. When both ends of the free space link are again functional, the link quality agent configures the port up and routes customer traffic to the free space link.

Abstract: A link quality agent running in a computer embedded in a device, such as an optical communication transceiver, to monitor avalanche photodiode (APD) and filter wheel values on each side of the free space link as well as packet errors from a distribution switch. When the link quality agent determines that the free space link is marginal, the link quality agent configures down the port between the distribution switch and the router on the receive end of the free space link, and forces customer traffic over a backup link. When both ends of the free space link are again functional, the link quality agent configures the port up and routes customer traffic to the free space link.

Abstract: A link quality agent running in a computer embedded in a device, such as an optical communication transceiver, to monitor avalanche photodiode (APD) and filter wheel values on each side of the free space link as well as packet errors from a distribution switch. When the link quality agent determines that the free space link is marginal, the link quality agent configures down the port between the distribution switch and the router on the receive end of the free space link, and forces customer traffic over a backup link. When both ends of the free space link are again functional, the link quality agent configures the port up and routes customer traffic to the free space link.