2019 IEEE Real-Time Systems Symposium (RTSS)最新文献_第5页

Work in Progress: Considering Heuristic Scheduling for NoC-Based Clustered Many-Core Processor Using LET Model 基于LET模型的基于noc的集群多核处理器启发式调度研究

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00053

Shingo Igarashi, Takuya Azumi

引用次数: 1

RT.js: Practical Real-Time Scheduling for Web Applications Web应用程序的实用实时调度

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00017

Christian J. Dietrich, Stefan Naumann, Robin Thrift, D. Lohmann

{"title":"RT.js: Practical Real-Time Scheduling for Web Applications","authors":"Christian J. Dietrich, Stefan Naumann, Robin Thrift, D. Lohmann","doi":"10.1109/RTSS46320.2019.00017","DOIUrl":"https://doi.org/10.1109/RTSS46320.2019.00017","url":null,"abstract":"For billions of deployed browsers, JavaScript provides the platform-independent lingua franca that enabled the triumphal march of web-based applications. Originally intended for simple UI-event processing, JavaScript comes with an event-driven programming model, where event-callback functions are executed in strict sequential order. However, with applications getting more complex and tasks becoming more computation intensive, its first-come-first-serve and run-to-completion semantic is hitting a limit, when reactions to user inputs are delayed beyond the human perception threshold. With the rise of the Internet of Things, this leads to friction-filled user experiences in everyday situations. With RT.js, we selectively introduce pseudo-preemption points into JavaScript functions and sequence the execution of event callbacks with well-known real-time scheduling policies, like EDF. Thereby, we provide a soft real-time abstraction that mitigates the described shortcomings of the JavaScript execution model without modifying the actual engine; making RT.js compatible with billions of devices. Applied to generated real-time task sets, we can almost eliminate the 30-percent deadline-miss ratios of baseline JavaScript at moderate costs. In a browser-based macro benchmark, we could diminish the influence of computation-intensive background tasks on the page-rendering performance.","PeriodicalId":102892,"journal":{"name":"2019 IEEE Real-Time Systems Symposium (RTSS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128529501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Thermally Composable Hybrid Application Mapping for Real-Time Applications in Heterogeneous Many-Core Systems 异构多核系统中实时应用的热可组合混合应用映射

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00029

Behnaz Pourmohseni, Fedor Smirnov, Heba Khdr, S. Wildermann, J. Teich, J. Henkel

{"title":"Thermally Composable Hybrid Application Mapping for Real-Time Applications in Heterogeneous Many-Core Systems","authors":"Behnaz Pourmohseni, Fedor Smirnov, Heba Khdr, S. Wildermann, J. Teich, J. Henkel","doi":"10.1109/RTSS46320.2019.00029","DOIUrl":"https://doi.org/10.1109/RTSS46320.2019.00029","url":null,"abstract":"Modern embedded many-core systems host, among others, real-time applications which must be dynamically launched at run time. To this end, Hybrid Application Mapping (HAM) methodologies combine design-time analysis with runtime mapping techniques to enable dynamic application mapping with performance guarantees, e.g., w.r.t. real-time constraints. They rely on composability to derive the required performance guarantees in an isolated analysis of individual applications at design time. The ongoing process technology downsizing, however, has given rise to an increased on-chip temperature, so that the thermal integrity of the platform must be monitored and enforced at run time by means of Dynamic Thermal Management (DTM) techniques which use countermeasures e.g. DVFS and power gating. This, however, violates composability, as the thermally unsafe behavior of one application may trigger DTM countermeasures that affect other applications running in the thermally affected region which, in turn, may lead to the violation of their real-time constraints. As a remedy, this paper proposes, for the first time, a thermally composable HAM methodology that enforces thermal safety proactively at the launch time of applications and, thereby, prevents DTM interferences which react to thermal violations. To that end, we present (a) a novel thermal-safety analysis that can be integrated into the design-time analysis of HAM and (b) a set of thermal-safety admission checks that can be used at run time when launching an application. By establishing thermal composability among running applications, the proposed HAM approach enables providing thermally safe real-time guarantees for dynamically mapped applications in many-core systems. Experimental results for a variety of hard real-time applications on multiple heterogeneous many-core architectures demonstrate the efficiency and effectiveness of the proposed methodology.","PeriodicalId":102892,"journal":{"name":"2019 IEEE Real-Time Systems Symposium (RTSS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124089946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

OpenVX and Real-Time Certification: The Troublesome History OpenVX和实时认证:麻烦的历史

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00036

Tanya Amert, S. Voronov, James H. Anderson

引用次数: 9

Work in Progress: Investigating the Effects of High Priority Traffic on the Best Effort Traffic in TSN Networks 正在进行的工作:调查TSN网络中高优先级流量对最佳努力流量的影响

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00063

Bahar Houtan, M. Ashjaei, M. Daneshtalab, Mikael Sjödin, S. Mubeen

引用次数: 8

Work-in-Progress: Understanding the Effect of Kernel Scheduling on GPU Energy Consumption 正在进行的工作:理解内核调度对GPU能耗的影响

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00070

Yidi Wang, Hyoseung Kim

引用次数: 4

Predictable Data-Driven Resource Management: an Implementation using Autoware on Autonomous Platforms 可预测的数据驱动资源管理:在自治平台上使用Autoware的实现

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00038

Soroush Bateni, Cong Liu

{"title":"Predictable Data-Driven Resource Management: an Implementation using Autoware on Autonomous Platforms","authors":"Soroush Bateni, Cong Liu","doi":"10.1109/RTSS46320.2019.00038","DOIUrl":"https://doi.org/10.1109/RTSS46320.2019.00038","url":null,"abstract":"Autonomous embedded systems (AES) are becoming prominent in many application domains such as self-driving cars. However, the conflict between the rather limited memory space in such systems and the data intensive nature of the workloads creates hard challenges on data and memory management, which may easily cause unpredictability in outputting autonomous control decisions. In this paper, we target data-driven AES featuring the integrated architecture by establishing a data-centric system model inspired by Heijunka, a mature production leveling methodology developed by Toyota. Based on this new model, we develop ResCue which contains a dynamic data scheduler and a flexible memory reservation scheme to ensure both temporal and spatial data availability, which shall guarantee predictability in generating outputs in terms of both meeting deadlines and minimizing jitters. We implement and extensively evaluate ResCue under various settings using a popular end-to-end self-driving software Autoware on top of the AES-specific NVIDIA AGX Xavier SoC. Results show that ResCue never misses a deadline and yields a maximum jitter of merely 834 microseconds, while incurring rather small overhead. Moreover, ResCue is able to noticeably reduce memory consumption compared to vanilla Autoware.","PeriodicalId":102892,"journal":{"name":"2019 IEEE Real-Time Systems Symposium (RTSS)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115746710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Securing Time in Untrusted Operating Systems with TimeSeal 使用TimeSeal在不受信任的操作系统中保护时间

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00018

F. Anwar, L. Garcia, Xing Han, M. Srivastava

{"title":"Securing Time in Untrusted Operating Systems with TimeSeal","authors":"F. Anwar, L. Garcia, Xing Han, M. Srivastava","doi":"10.1109/RTSS46320.2019.00018","DOIUrl":"https://doi.org/10.1109/RTSS46320.2019.00018","url":null,"abstract":"An accurate sense of elapsed time is essential for the safe and correct operation of hardware, software, and networked systems. Unfortunately, an adversary can manipulate the system's time and violate causality, consistency, and scheduling properties of underlying applications. Although cryptographic techniques are used to secure data, they cannot ensure time security as securing a time source is much more challenging, given that the result of inquiring time must be delivered in a timely fashion. In this paper, we first describe general attack vectors that can compromise a system's sense of time. To counter these attacks, we propose a secure time architecture, TIMESEAL that leverages a Trusted Execution Environment (TEE) to secure time-based primitives. While CPU security features of TEEs secure code and data in protected memory, we show that time sources available in TEE are still prone to OS attacks. TIMESEAL puts forward a high-resolution time source that protects against the OS delay and scheduling attacks. Our TIMESEAL prototype is based on Intel SGX and provides sub-millisecond (msec) resolution as compared to 1-second resolution of SGX trusted time. It also securely bounds the relative time accuracy to msec under OS attacks. In essence, TIMESEAL provides the capability of trusted timestamping and trusted scheduling to critical applications in the presence of a strong adversary. It delivers all temporal use cases pertinent to secure sensing, computing, and actuating in networked systems.","PeriodicalId":102892,"journal":{"name":"2019 IEEE Real-Time Systems Symposium (RTSS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121104740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Predicting Latency Distributions of Aperiodic Time-Critical Services 预测非周期时间关键业务的延迟分布

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/RTSS46320.2019.00014

Haoran Li, Chenyang Lu, C. Gill

{"title":"Predicting Latency Distributions of Aperiodic Time-Critical Services","authors":"Haoran Li, Chenyang Lu, C. Gill","doi":"10.1109/RTSS46320.2019.00014","DOIUrl":"https://doi.org/10.1109/RTSS46320.2019.00014","url":null,"abstract":"There is increasing interest in supporting time-critical services in cloud computing environments. Those cloud services differ from traditional hard real-time systems in three aspects. First, cloud services usually involve latency requirements in terms of probabilistic tail latency instead of hard deadlines. Second, some cloud services need to handle aperiodic requests for stochastic arrival processes instead of traditional periodic or sporadic models. Finally, the computing platform must provide performance isolation between time-critical services and other workloads. It is therefore essential to provision resources to meet different tail latency requirements. As a step towards cloud services with stochastic latency guarantees, this paper presents a stochastic response time analysis for aperiodic services following a Poisson arrival process on computing platforms that schedue time-critical services as deferrable servers. The stochastic analysis enables a service operator to provision CPU resources for aperiodic services to achieve a desired tail latency. We evaluated the method in two case studies, one involving a synthetic service and another involving a Redis service, both on a testbed based on Xen 4.10. The results demonstrate the validity and efficacy of our method in a practical setting.","PeriodicalId":102892,"journal":{"name":"2019 IEEE Real-Time Systems Symposium (RTSS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116709195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

[Title page iii] [标题页iii]

2019 IEEE Real-Time Systems Symposium (RTSS) Pub Date : 2019-12-01 DOI: 10.1109/rtss46320.2019.00002

引用次数: 0