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ParPerOS: Parallel Persistency OS (DFG: DI 2840/2-1)

ParPerOS is a joint project with SRA (Co-PI: Daniel Lohmann) and part of the DFG Priority Program "Disruptive Memory Technologies" (SPP 2377, Speaker: Olaf Spinczyk).

The management of memory resources has always been a core task of the operating system. However, OS designers are now facing disruptive changes on the memory side: New memory types, such as high-bandwith memory (HBM) or non-volatile memory (NVM) have arrived and more types of processing elements, such as RDMA-capable NICs, GPGPUs, or FPGA-based accellerators, access virtual memory directly via the IO-MMU. These heterogenious memory systems (HMSs) put not only the suitability of the classical memory hierarchy and memory access patterns at question, but also challenge the way memory is managed inside the kernel.

In ParPerOS, we examine new abstractions for unified but efficient and optionally crash-consistent low-level memory management for data objects in heterogeneous memory systems that may consist of volatile, persistent, distributed and other types of main memory, accessed in parallel by a multitude of different processing elements (CPU, GPU, NIC, RDMA).

People

Publications

JSA Journal
Analyzing the memory ordering models of the Apple M1

Lars Wrenger, Dominik Töllner, Daniel LohmannJournal of Systems Architecture1492024.
PDF https://doi.org/10.1016/j.sysarc.2024.103102 [BibTex]

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BibTex Entry

@article{wrenger:24:jsa,
author = {Lars Wrenger and Dominik Töllner and Daniel Lohmann},
date = {2024-04},
doi = {https://doi.org/10.1016/j.sysarc.2024.103102},
entrysubtype = {Journal},
issn = {1383-7621},
journaltitle = {Journal of Systems Architecture},
keywords = {TSO, Memory ordering, Apple M1, ARM},
month = {apr},
pages = {103102},
title = {Analyzing the memory ordering models of the Apple M1},
url = {https://www.sciencedirect.com/science/article/pii/S1383762124000390},
volume = {149},
year = {2024},
}

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DIMES Workshop
The New Costs of Physical Memory Fragmentation

Alexander Halbuer, Illia Ostapyshyn, Lukas Steiner, Lars Wrenger, Matthias Jung, Christian Dietrich, Daniel LohmannProceedings of the 2nd Workshop on Disruptive Memory SystemsAssociation for Computing Machinery2024.
PDF 10.1145/3698783.3699378 [BibTex]

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BibTex Entry

@inproceedings{halbuer:24:dimes,
author = {Alexander Halbuer and Illia Ostapyshyn and Lukas Steiner and Lars Wrenger and Matthias Jung and Christian Dietrich and Daniel Lohmann},
booktitle = {Proceedings of the 2nd Workshop on Disruptive Memory Systems},
doi = {10.1145/3698783.3699378},
entrysubtype = {Workshop},
location = {Austin, Texas, USA},
publisher = {Association for Computing Machinery},
title = {The New Costs of Physical Memory Fragmentation},
year = {2024},
}

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DIMES Workshop
Morsels: Explicit Virtual Memory Objects

Alexander Halbuer, Christian Dietrich, Florian Rommel, Daniel LohmannProceedings of the 1st Workshop on Disruptive Memory SystemsAssociation for Computing Machinery2023.
PDF Slides 10.1145/3609308.3625267 [BibTex]

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BibTex Entry

@inproceedings{halbuer:23:dimes,
author = {Alexander Halbuer and Christian Dietrich and Florian Rommel and Daniel Lohmann},
booktitle = {Proceedings of the 1st Workshop on Disruptive Memory Systems},
date = {2023-10},
doi = {10.1145/3609308.3625267},
entrysubtype = {Workshop},
location = {Koblenz, Germany},
month = {October},
publisher = {Association for Computing Machinery},
series = {DIMES '23},
title = {Morsels: Explicit Virtual Memory Objects},
url = {https://doi.org/10.1145/3609308.3625267},
year = {2023},
}

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USENIX Conference A Distinguished Artifact Award
LLFree: Scalable and Optionally-Persistent Page-Frame Allocation

Lars Wrenger, Florian Rommel, Alexander Halbuer, Christian Dietrich, Daniel Lohmann2023 USENIX Annual Technical Conference (USENIX '23)USENIX Association2023Distinguished Artifact Award.
PDF Slides [BibTex]

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BibTex Entry

@inproceedings{wrenger:23:atc,
location = {Boston, MA},
author = {Wrenger, Lars and Rommel, Florian and Halbuer, Alexander and Dietrich, Christian and Lohmann, Daniel},
booktitle = {2023 USENIX Annual Technical Conference (USENIX '23)},
entrysubtype = {Conference},
isbn = {978-1-939133-35-9},
month = {jul},
pages = {897–914},
publisher = {USENIX Association},
title = {{LLFree}: Scalable and {Optionally-Persistent} {Page-Frame} Allocation},
url = {https://www.usenix.org/conference/atc23/presentation/wrenger},
year = {2023},
}

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USENIX Conference A
MELF: Multivariant Executables for a Heterogeneous World

Dominik Töllner, Christian Dietrich, Illia Ostapyshyn, Florian Rommel, Daniel Lohmann2023 USENIX Annual Technical Conference (USENIX '23)USENIX Association2023.
PDF [BibTex]

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BibTex Entry

@inproceedings{toellner:23:atc,
location = {Boston, MA},
author = {Töllner, Dominik and Dietrich, Christian and Ostapyshyn, Illia and Rommel, Florian and Lohmann, Daniel},
booktitle = {2023 USENIX Annual Technical Conference (USENIX '23)},
entrysubtype = {Conference},
isbn = {978-1-939133-35-9},
month = {July},
pages = {257–273},
publisher = {USENIX Association},
title = {{MELF}: Multivariant Executables for a Heterogeneous World},
url = {https://www.usenix.org/conference/atc23/presentation/tollner},
year = {2023},
}

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ARCS Conference Best Paper Award
TOSTING: Investigating Total Store Ordering on ARM

Lars Wrenger, Dominik Töllner, Daniel LohmannProceedings of the 36th GI/ITG International Conference on Architecture of Computing Systems (ARCS 23)Springer International Publishing2023Best Paper Award.
PDF Slides [BibTex]

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BibTex Entry

@inproceedings{wrenger:23:arcs,
location = {Athens, Greece},
author = {Wrenger, Lars and Töllner, Dominik and Lohmann, Daniel},
booktitle = {Proceedings of the 36th GI/ITG International Conference on Architecture of Computing Systems (ARCS 23)},
entrysubtype = {Conference},
month = {July},
publisher = {Springer International Publishing},
title = {{TOSTING}: Investigating Total Store Ordering on ARM},
year = {2023},
}

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SIGMOD Conference A*
Virtual-Memory Assisted Buffer Management

Viktor Leis, Adnan Alhomssi, Tobias Ziegler, Yannick Loeck, Christian DietrichProceedings of the ACM SIGMOD/PODS International Conference on Management of DataACM2023.
PDF 10.1145/3588687 [BibTex]

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BibTex Entry

@inproceedings{leis:23:sigmod,
location = {New York, NY, USA},
author = {Viktor Leis and Adnan Alhomssi and Tobias Ziegler and Yannick Loeck and Christian Dietrich},
booktitle = {Proceedings of the ACM SIGMOD/PODS International Conference on Management of Data},
doi = {10.1145/3588687},
entrysubtype = {Conference},
location = {Seattle, WA, USA},
month = {June},
publisher = {ACM},
title = {Virtual-Memory Assisted Buffer Management},
year = {2023},
}

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Theses

Open Topics

CXL.morsel: CXL-attached Virtual Memory

Typ: Bachelor-/Masterarbeit
Status: offen
Supervisors: Christian Dietrich
Make virtualized memory available via CXL

PhD Student/PostDoc for Disruptive Memory Technologies

Typ: Wiss. Mitarbeiter:in Stelle
Status: offen
Supervisors: Christian Dietrich
Research and Teaching in the Area of Reliable System Software

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