Multi-Core Intra-Process Clock Synchronization

James Coleman; Clark Newman; Yann Hang Lee

doi:10.1109/ISPCS49990.2021.9615343

Multi-Core Intra-Process Clock Synchronization

James Coleman, Clark Newman, Yann Hang Lee

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Real-Time applications require not only a precise understanding of now (what time it is), but also the ability to initiate an externally visible event at the correct time. We define this as Intra-process clock synchronization. Our findings show that in the latest commercial, off-The-shelf (COTS) multi-core systems running with preempt-RT Linux, the uncertainty in the software visible clock is nearly 5 μs and the precision of user-space software in controlling an externally visible event has a jitter of over 13 μs. By employing emerging hardware mechanisms, the uncertainty can be reduced to just over 200 ns, with the jitter lowered to just 65 ns.

Original language	English (US)
Title of host publication	ISPCS 2021 - International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings
Publisher	IEEE Computer Society
ISBN (Electronic)	9781728164847
DOIs	https://doi.org/10.1109/ISPCS49990.2021.9615343
State	Published - 2021
Externally published	Yes
Event	2021 Annual IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS 2021 - Virtual, Online, United States Duration: Oct 27 2021 → Oct 28 2021

Publication series

Name	IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS
ISSN (Print)	1949-0305
ISSN (Electronic)	1949-0313

Conference

Conference	2021 Annual IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS 2021
Country/Territory	United States
City	Virtual, Online
Period	10/27/21 → 10/28/21

Keywords

Real-Time cyber physical systems
Time Sensitive Networks
clock disciplining mechanisms
clock synchronization
software visible clock

ASJC Scopus subject areas

Computer Networks and Communications
Control and Systems Engineering

Access to Document

10.1109/ISPCS49990.2021.9615343

Cite this

Coleman, J., Newman, C., & Lee, Y. H. (2021). Multi-Core Intra-Process Clock Synchronization. In ISPCS 2021 - International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings (IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS). IEEE Computer Society. https://doi.org/10.1109/ISPCS49990.2021.9615343

Multi-Core Intra-Process Clock Synchronization. / Coleman, James; Newman, Clark; Lee, Yann Hang.
ISPCS 2021 - International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings. IEEE Computer Society, 2021. (IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Coleman, J, Newman, C & Lee, YH 2021, Multi-Core Intra-Process Clock Synchronization. in ISPCS 2021 - International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings. IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS, IEEE Computer Society, 2021 Annual IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS 2021, Virtual, Online, United States, 10/27/21. https://doi.org/10.1109/ISPCS49990.2021.9615343

Coleman J, Newman C, Lee YH. Multi-Core Intra-Process Clock Synchronization. In ISPCS 2021 - International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings. IEEE Computer Society. 2021. (IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS). doi: 10.1109/ISPCS49990.2021.9615343

Coleman, James ; Newman, Clark ; Lee, Yann Hang. / Multi-Core Intra-Process Clock Synchronization. ISPCS 2021 - International IEEE Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, Proceedings. IEEE Computer Society, 2021. (IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication, ISPCS).

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abstract = "Real-Time applications require not only a precise understanding of now (what time it is), but also the ability to initiate an externally visible event at the correct time. We define this as Intra-process clock synchronization. Our findings show that in the latest commercial, off-The-shelf (COTS) multi-core systems running with preempt-RT Linux, the uncertainty in the software visible clock is nearly 5 μs and the precision of user-space software in controlling an externally visible event has a jitter of over 13 μs. By employing emerging hardware mechanisms, the uncertainty can be reduced to just over 200 ns, with the jitter lowered to just 65 ns.",

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Multi-Core Intra-Process Clock Synchronization

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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