4 Search Results for "Nemitz, Catherine E."

Document
Artifact
DOI: 10.4230/DARTS.7.1.3
Light Reading: Optimizing Reader/Writer Locking for Read-Dominant Real-Time Workloads (Artifact)

Authors: Catherine E. Nemitz, Shai Caspin, James H. Anderson, and Bryan C. Ward

Published in: DARTS, Volume 7, Issue 1, Special Issue of the 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021)

Abstract
This paper is directed at reader/writer locking for read-dominant real-time workloads. It is shown that state-of-the-art real-time reader/writer locking protocols are subject to performance limitations when reads dominate, and that existing schedulability analysis fails to leverage the sparsity of writes in this case. A new reader/writer locking-protocol implementation and new inflation-free schedulability analysis are proposed to address these problems. Overhead evaluations of the new implementation show a decrease in overheads of up to 70% over previous implementations, leading to throughput for read operations increasing by up to 450%. Schedulability experiments are presented that show that the analysis results in schedulability improvements of up to 156.8% compared to the existing state-of-the-art approach.
Cite as

Catherine E. Nemitz, Shai Caspin, James H. Anderson, and Bryan C. Ward. Light Reading: Optimizing Reader/Writer Locking for Read-Dominant Real-Time Workloads (Artifact). In Special Issue of the 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021). Dagstuhl Artifacts Series (DARTS), Volume 7, Issue 1, pp. 3:1-3:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@Article{nemitz_et_al:DARTS.7.1.3,
  author =	{Nemitz, Catherine E. and Caspin, Shai and Anderson, James H. and Ward, Bryan C.},
  title =	{{Light Reading: Optimizing Reader/Writer Locking for Read-Dominant Real-Time Workloads (Artifact)}},
  pages =	{3:1--3:3},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2021},
  volume =	{7},
  number =	{1},
  editor =	{Nemitz, Catherine E. and Caspin, Shai and Anderson, James H. and Ward, Bryan C.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DARTS.7.1.3},
  URN =		{urn:nbn:de:0030-drops-139828},
  doi =		{10.4230/DARTS.7.1.3},
  annote =	{Keywords: Reader/writer, real-time, synchronization, spinlock, RMR complexity}
}
Document
DOI: 10.4230/LIPIcs.ECRTS.2021.6
Light Reading: Optimizing Reader/Writer Locking for Read-Dominant Real-Time Workloads

Authors: Catherine E. Nemitz, Shai Caspin, James H. Anderson, and Bryan C. Ward

Published in: LIPIcs, Volume 196, 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021)

Abstract
This paper is directed at reader/writer locking for read-dominant real-time workloads. It is shown that state-of-the-art real-time reader/writer locking protocols are subject to performance limitations when reads dominate, and that existing schedulability analysis fails to leverage the sparsity of writes in this case. A new reader/writer locking-protocol implementation and new inflation-free schedulability analysis are proposed to address these problems. Overhead evaluations of the new implementation show a decrease in overheads of up to 70% over previous implementations, leading to throughput for read operations increasing by up to 450%. Schedulability experiments are presented that show that the analysis results in schedulability improvements of up to 156.8% compared to the existing state-of-the-art approach.
Cite as

Catherine E. Nemitz, Shai Caspin, James H. Anderson, and Bryan C. Ward. Light Reading: Optimizing Reader/Writer Locking for Read-Dominant Real-Time Workloads. In 33rd Euromicro Conference on Real-Time Systems (ECRTS 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 196, pp. 6:1-6:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{nemitz_et_al:LIPIcs.ECRTS.2021.6,
  author =	{Nemitz, Catherine E. and Caspin, Shai and Anderson, James H. and Ward, Bryan C.},
  title =	{{Light Reading: Optimizing Reader/Writer Locking for Read-Dominant Real-Time Workloads}},
  booktitle =	{33rd Euromicro Conference on Real-Time Systems (ECRTS 2021)},
  pages =	{6:1--6:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-192-4},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{196},
  editor =	{Brandenburg, Bj\"{o}rn B.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2021.6},
  URN =		{urn:nbn:de:0030-drops-139378},
  doi =		{10.4230/LIPIcs.ECRTS.2021.6},
  annote =	{Keywords: Reader/writer, real-time, synchronization, spinlock, RMR complexity}
}
Document
DOI: 10.4230/LIPIcs.ECRTS.2018.25
Using Lock Servers to Scale Real-Time Locking Protocols: Chasing Ever-Increasing Core Counts

Authors: Catherine E. Nemitz, Tanya Amert, and James H. Anderson

Published in: LIPIcs, Volume 106, 30th Euromicro Conference on Real-Time Systems (ECRTS 2018)

Abstract
During the past decade, parallelism-related issues have been at the forefront of real-time systems research due to the advent of multicore technologies. In the coming years, such issues will loom ever larger due to increasing core counts. Having more cores means a greater potential exists for platform capacity loss when the available parallelism cannot be fully exploited. In this paper, such capacity loss is considered in the context of real-time locking protocols. In this context, lock nesting becomes a key concern as it can result in transitive blocking chains that force tasks to execute sequentially unnecessarily. Such chains can be quite long on a larger machine. Contention-sensitive real-time locking protocols have been proposed as a means of "breaking" transitive blocking chains, but such protocols tend to have high overhead due to more complicated lock/unlock logic. To ease such overhead, the usage of lock servers is considered herein. In particular, four specific lock-server paradigms are proposed and many nuances concerning their deployment are explored. Experiments are presented that show that, by executing cache hot, lock servers can enable reductions in lock/unlock overhead of up to 86%. Such reductions make contention-sensitive protocols a viable approach in practice.
Cite as

Catherine E. Nemitz, Tanya Amert, and James H. Anderson. Using Lock Servers to Scale Real-Time Locking Protocols: Chasing Ever-Increasing Core Counts. In 30th Euromicro Conference on Real-Time Systems (ECRTS 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 106, pp. 25:1-25:24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

Copy BibTex To Clipboard

@InProceedings{nemitz_et_al:LIPIcs.ECRTS.2018.25,
  author =	{Nemitz, Catherine E. and Amert, Tanya and Anderson, James H.},
  title =	{{Using Lock Servers to Scale Real-Time Locking Protocols: Chasing Ever-Increasing Core Counts}},
  booktitle =	{30th Euromicro Conference on Real-Time Systems (ECRTS 2018)},
  pages =	{25:1--25:24},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-075-0},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{106},
  editor =	{Altmeyer, Sebastian},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2018.25},
  URN =		{urn:nbn:de:0030-drops-89789},
  doi =		{10.4230/LIPIcs.ECRTS.2018.25},
  annote =	{Keywords: multiprocess locking protocols, nested locks, priority-inversion blocking, reader/writer locks, real-time locking protocols}
}
Document
DOI: 10.4230/DARTS.4.2.2
Using Lock Servers to Scale Real-Time Locking Protocols: Chasing Ever-Increasing Core Counts (Artifact)

Authors: Catherine E. Nemitz, Tanya Amert, and James H. Anderson

Published in: DARTS, Volume 4, Issue 2, Special Issue of the 30th Euromicro Conference on Real-Time Systems (ECRTS 2018)

Abstract
During the past decade, parallelism-related issues have been at the forefront of real-time systems research due to the advent of multicore technologies. In the coming years, such issues will loom ever larger due to increasing core counts. Having more cores means a greater potential exists for platform capacity loss when the available parallelism cannot be fully exploited. In this work, such capacity loss is considered in the context of real-time locking protocols. In this context, lock nesting becomes a key concern as it can result in transitive blocking chains that force tasks to execute sequentially unnecessarily. Such chains can be quite long on a larger machine. Contention-sensitive real-time locking protocols have been proposed as a means of ``breaking'' transitive blocking chains, but such protocols tend to have high overhead due to more complicated lock/unlock logic. To ease such overhead, the usage of lock servers is considered herein. In particular, four specific lock-server paradigms are proposed and many nuances concerning their deployment are explored. Experiments are presented that show that, by executing cache hot, lock servers can enable reductions in lock/unlock overhead of up to 86\%. Such reductions make contention-sensitive protocols a viable approach in practice. This artifact contains the implementation of two contention-sensitive locking protocol variants implemented with four proposed lock-server paradigms, as well as the experiments with which they were evaluated.
Cite as

Catherine E. Nemitz, Tanya Amert, and James H. Anderson. Using Lock Servers to Scale Real-Time Locking Protocols: Chasing Ever-Increasing Core Counts (Artifact). In Special Issue of the 30th Euromicro Conference on Real-Time Systems (ECRTS 2018). Dagstuhl Artifacts Series (DARTS), Volume 4, Issue 2, pp. 2:1-2:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@Article{nemitz_et_al:DARTS.4.2.2,
  author =	{Nemitz, Catherine E. and Amert, Tanya and Anderson, James H.},
  title =	{{Using Lock Servers to Scale Real-Time Locking Protocols: Chasing Ever-Increasing Core Counts (Artifact)}},
  pages =	{2:1--2:3},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2018},
  volume =	{4},
  number =	{2},
  editor =	{Nemitz, Catherine E. and Amert, Tanya and Anderson, James H.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.4.2.2},
  URN =		{urn:nbn:de:0030-drops-89704},
  doi =		{10.4230/DARTS.4.2.2},
  annote =	{Keywords: multiprocess locking protocols, nested locks, priority-inversion blocking, reader/writer locks, real-time locking protocols}
}
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