2,189 research outputs found
Performance study of synthetic AER generation on CPUs for Real-Time Video based on Spikes
Address-Event-Representation (AER) is a neuromorphic interchip communication protocol that allows for real-time virtual massive connectivity between huge number neurons located on different chips. When building multi-chip muti-layered AER systems it is absolutely necessary to have a computer interface that allows (a) to read AER interchip traffic into the computer and visualize it on screen, and (b) convert conventional frame-based video stream in the computer into AER and inject it at some point of the AER structure. This is necessary for test and debugging of complex AER systems. Previous work presented several software methods for converting digital frames into AER format. Those methods were not feasible for real-time conversion those days because the processor performance was insufficient. Nowadays, Multi-core processor architectures and cache hierarchies have evolved and the performance is much better than Pentium 4 Mobile of those years. In this paper we study frame-to-AER methods for realtime video applications (40ms per frame) using modern processor architectures, compilers, and processors oriented for stand-alone applications (mini-PC processors
Understand Your Chains: Towards Performance Profile-based Network Service Management
Allocating resources to virtualized network functions and services to meet
service level agreements is a challenging task for NFV management and
orchestration systems. This becomes even more challenging when agile
development methodologies, like DevOps, are applied. In such scenarios,
management and orchestration systems are continuously facing new versions of
functions and services which makes it hard to decide how much resources have to
be allocated to them to provide the expected service performance. One solution
for this problem is to support resource allocation decisions with performance
behavior information obtained by profiling techniques applied to such network
functions and services.
In this position paper, we analyze and discuss the components needed to
generate such performance behavior information within the NFV DevOps workflow.
We also outline research questions that identify open issues and missing pieces
for a fully integrated NFV profiling solution. Further, we introduce a novel
profiling mechanism that is able to profile virtualized network functions and
entire network service chains under different resource constraints before they
are deployed on production infrastructure.Comment: Submitted to and accepted by the European Workshop on Software
Defined Networks (EWSDN) 201
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Multi-core processors and the future of parallelism in software
The purpose of this thesis is to examine multi-core technology. Multi-core architecture provides benefits such as less power consumption, scalability, and improved application performance enabled by thread-level parallelism
POWER-SUPPLaY: Leaking Data from Air-Gapped Systems by Turning the Power-Supplies Into Speakers
It is known that attackers can exfiltrate data from air-gapped computers
through their speakers via sonic and ultrasonic waves. To eliminate the threat
of such acoustic covert channels in sensitive systems, audio hardware can be
disabled and the use of loudspeakers can be strictly forbidden. Such audio-less
systems are considered to be \textit{audio-gapped}, and hence immune to
acoustic covert channels.
In this paper, we introduce a technique that enable attackers leak data
acoustically from air-gapped and audio-gapped systems. Our developed malware
can exploit the computer power supply unit (PSU) to play sounds and use it as
an out-of-band, secondary speaker with limited capabilities. The malicious code
manipulates the internal \textit{switching frequency} of the power supply and
hence controls the sound waveforms generated from its capacitors and
transformers. Our technique enables producing audio tones in a frequency band
of 0-24khz and playing audio streams (e.g., WAV) from a computer power supply
without the need for audio hardware or speakers. Binary data (files,
keylogging, encryption keys, etc.) can be modulated over the acoustic signals
and sent to a nearby receiver (e.g., smartphone). We show that our technique
works with various types of systems: PC workstations and servers, as well as
embedded systems and IoT devices that have no audio hardware at all. We provide
technical background and discuss implementation details such as signal
generation and data modulation. We show that the POWER-SUPPLaY code can operate
from an ordinary user-mode process and doesn't need any hardware access or
special privileges. Our evaluation shows that using POWER-SUPPLaY, sensitive
data can be exfiltrated from air-gapped and audio-gapped systems from a
distance of five meters away at a maximal bit rates of 50 bit/sec
Advanced Topics in Systems Safety and Security
This book presents valuable research results in the challenging field of systems (cyber)security. It is a reprint of the Information (MDPI, Basel) - Special Issue (SI) on Advanced Topics in Systems Safety and Security. The competitive review process of MDPI journals guarantees the quality of the presented concepts and results. The SI comprises high-quality papers focused on cutting-edge research topics in cybersecurity of computer networks and industrial control systems. The contributions presented in this book are mainly the extended versions of selected papers presented at the 7th and the 8th editions of the International Workshop on Systems Safety and Security—IWSSS. These two editions took place in Romania in 2019 and respectively in 2020. In addition to the selected papers from IWSSS, the special issue includes other valuable and relevant contributions. The papers included in this reprint discuss various subjects ranging from cyberattack or criminal activities detection, evaluation of the attacker skills, modeling of the cyber-attacks, and mobile application security evaluation. Given this diversity of topics and the scientific level of papers, we consider this book a valuable reference for researchers in the security and safety of systems
Thermal Benchmark and Power Benchmark Software
Power consumption and heat dissipation become key elements in the field of
high-end integrated circuits, especially those used in mobile and high-speed
applications, due to their increase of transistor count and clock frequencies.
Dynamic thermal management strategies have been proposed and implemented in
order to mitigate heat dissipation. However, there is a lack of a tool that can
be used to evaluate DTM strategies and thermal response of real life systems.
Therefore, in this paper we introduce and define the concepts of thermal
benchmark software and power benchmark software as a software application for
run-time system level thermal and power characterizationComment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
H.264/AVC inter prediction on accelerator-based multi-core systems
The AVC video coding standard adopts variable block sizes for inter frame coding to increase compression efficiency, among other new features. As a consequence of this, an AVC encoder has to employ a complex mode decision technique that requires high computational complexity. Several techniques aimed at accelerating the inter prediction process have been proposed in the literature in recent years. Recently, with the emergence of many-core processors or accelerators, a new way of supporting inter frame prediction has presented itself. In this paper, we present a step forward in the implementation of an AVC inter prediction algorithm in a graphics processing unit, using Compute Unified Device Architecture. The results show a negligible drop in rate distortion with a time reduction, on average, of over 98.8 % compared with full search and fast full search, and of over 80 % compared with UMHexagonS search
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