Lars Wrenger (M.Sc.)

Wissenschaftlicher Mitarbeiter

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Telefon

0511 762 19729

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E-mail

wrenger@sra.uni-hannover.de

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Adresse

Appelstraße 4
30167 Hannover

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Gebäude

3703

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Raum

Raum 119

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Appelstraße 4 Raum 119

Projects

ParPerOS: Parallel Persistency OS (DFG: LO 1719/8-1 and DI 2840/2-1)

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 consist of volatile, persistent, distributed and other types of main memory.

Publications

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 Details 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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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 Details 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},
}

Close

DIMES Workshop Best Paper Award
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 Systems (SOSP-DIMES '24)Association for Computing Machinery2024Best Paper Award.
PDF Details 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 (SOSP-DIMES '24)},
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},
}

Close

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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Teaching

Supervised Student Theses

Running Theses

AsyncZero: Latency Hiding of Page Zeroing in Linux

This thesis focuses on techniques to pre-zero pages or offload page zeroing to DMA devices.

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Typ

Masterarbeit

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Status

laufend

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Supervisors

Lars Wrenger
Daniel Lohmann

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Project

ParPerOS

LLMmap: Improving Memory Reclamation by Sharing the Allocation State in Linux

We want to give the kernel a better way to see which pages are used in processes so that it can reclaim unused memory more effectively.

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Typ

Bachelorarbeit

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Status

reserviert

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Supervisors

Lars Wrenger
Daniel Lohmann

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Project

ParPerOS

Finished Theses

Primitives and Abstractions for Self-Contained Virtual-Memory Areas in the Linux kernel

Implement the basic abstraction for self-contained virtual-address-space areas in Linux, by which we want to ease the allocation, the sharing, and the management of huge amounts of memory. [PDF]

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Typ

Masterarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Florian Rommel
Christian Dietrich
Daniel Lohmann

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Project

ParPerOS

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Bearbeiter

Alexander Halbuer (abgegeben: 16. Nov 2022)

Fast Memory Compaction for Page Allocators

Active memory defragmentation for page allocators.

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Typ

Bachelorarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Daniel Lohmann

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Project

ParPerOS

LLC: DeRUSTing the Lo(ck|g)-Free Allocator for a C-Based OS Integration

Porting the LLFree concept from Rust to C, to simplify the integration into C-based OSs.

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Typ

Bachelorarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Daniel Lohmann

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Project

ParPerOS

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Bearbeiter

Helge Misfeldt (abgegeben: 18. Aug 2023)

Investigating Suspend to Disk in Linux

Researching and optionally extending the Linux Suspend to Disk Mechanism.

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Typ

Bachelorarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Daniel Lohmann

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Project

ParPerOS

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Bearbeiter

Jannik Jahn (abgegeben: 25. Sep 2023)

Investigating Total Store Ordering on the ARM M1

Analyzing the performance impact of Total Store Ordering on the M1 ARM Processor.

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Typ

Masterarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Dominik Töllner
Daniel Lohmann

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Project

ParPerOS

Fast Memory Ballooning for Virtual Machines with LLFree

Implementing hypervisor memory overcommitment with shared LLFree allocators.

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Typ

Masterarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Daniel Lohmann

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Project

ParPerOS

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Bearbeiter

Marco Wurps (abgegeben: 02. May 2024)

Optimizing Memory Metadata: Dynamic Allocation of Struct Pages in the Linux Kernel

Dynamically allocate a struct page in cases where it is needed and omit the memory overhead in cases where it is not.

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Typ

Masterarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Alexander Halbuer
Daniel Lohmann

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Project

ParPerOS

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Bearbeiter

Paul Aumann (abgegeben: 14. Jun 2024)

LLFreeBSD: Integrating the LLFree Page Frame Allocator into FreeBSD

We now have a C-based LLFree implementation that can be integrated into other OS's. This topic focuses on the integration of LLFree into the FreeBSD operating system.

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Typ

Bachelorarbeit

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Status

abgeschlossen

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Supervisors

Lars Wrenger
Daniel Lohmann

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Project

ParPerOS

Own Thesis

Lo(ck|g)-free Page Allocator for Non-Volatile Memory in the Linux Kernel

Designing and implementing a lock-free and log-free page allocator for morsels, a new abstraction for the management of non-volatile memory in the linux kernel [PDF]

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Typ

Masterarbeit

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Status

abgeschlossen

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Supervisors

Florian Rommel
Christian Dietrich
Daniel Lohmann

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Project

ParPerOS

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Bearbeiter

Lars Wrenger (abgegeben: 04. Apr 2022)

How to trust the Snake: Extending the Chain of Trust to Interpreted Languages on Highly Embedded Systems

Extend Micropython so, that it can decide whether or not the code was put in place by the developer, not a hacker. Also the integrity of the code needs to be proven during execution.

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Typ

Bachelorarbeit

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Status

abgeschlossen

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Supervisors

Stefan Naumann
Daniel Lohmann

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Project

CADOS

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Bearbeiter

Lars Wrenger