NSTX-U advances in real-time deterministic PCIe-based internode communication

Erickson, Keith G.; Boyer, M. Dan; Higgins, David

doi:10.1016/j.fusengdes.2018.02.055

Title: NSTX-U advances in real-time deterministic PCIe-based internode communication

Journal Article · Thu Jun 07 00:00:00 EDT 2018 · Fusion Engineering and Design

DOI:https://doi.org/10.1016/j.fusengdes.2018.02.055· OSTI ID:1460738

^[1]; Boyer, M. Dan ^[1]; Higgins, David ^[2]

Princeton Univ. Plasma Physics Lab, Princeton, NJ (United States)
Concurrent Real-Time, Pompano Beach, FL (United States)

Distributing control mechanisms across modern commercial off the shelf (COTS) GNU/Linux systems often introduces difficult to mitigate non-deterministic behavior. Existing methods to address this problem involve non-real-time technologies such as Remote Direct Memory Access (RDMA) over Infiniband or custom Ethernet solutions, such as RDMA over Converged Ethernet (RoCE) or userspace Ethernet drivers, that trade determinism for ease of use or lower cost. The National Spherical Torus Experiment Upgrade (NSTX-U) is pursuing a new design that allows direct communication between heterogeneous systems with scalable, microsecond latency with 1 μs of jitter on that latency, outside of the constant transmission delay at the physical layer. The future design of the NSTX-U Real-time Communication System will utilize direct PCIe-to-PCIe communication with kernel support tuned for low overhead, allowing two (or more, through a switch) real-time (RT) systems to communicate and share resources as one larger entity. As a result, this greatly increases the processing capability of the primary Plasma Control System (PCS), turning previously insurmountable computational challenges into a more manageable divide and conquer parallel task.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1460738

Alternate ID(s):: OSTI ID: 1582731

Journal Information:: Fusion Engineering and Design, Vol. 133, Issue C; ISSN 0920-3796

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Cited By (1)

Real-time capable modeling of neutral beam injection on NSTX-U using neural networks Boyer, M. D.; Kaye, S.; Erickson, K. Nuclear Fusion, Vol. 59, Issue 5 https://doi.org/10.1088/1741-4326/ab0762	journal	March 2019