Results 1 - 10
of
276
Distributed Computing in Practice: The Condor Experience
- Concurrency and Computation: Practice and Experience
, 2005
"... Since 1984, the Condor project has enabled ordinary users to do extraordinary computing. Today, the project continues to explore the social and technical problems of cooperative computing on scales ranging from the desktop to the world-wide computational grid. In this chapter, we provide the history ..."
Abstract
-
Cited by 542 (7 self)
- Add to MetaCart
Since 1984, the Condor project has enabled ordinary users to do extraordinary computing. Today, the project continues to explore the social and technical problems of cooperative computing on scales ranging from the desktop to the world-wide computational grid. In this chapter, we provide the history and philosophy of the Condor project and describe how it has interacted with other projects and evolved along with the field of distributed computing. We outline the core components of the Condor system and describe how the technology of computing must correspond to social structures. Throughout, we reflect on the lessons of experience and chart the course traveled by research ideas as they grow into production systems.
Improving the reliability of commodity operating systems
, 2003
"... drivers remain a significant cause of system failures. In Windows XP, for example, drivers account for 85 % of recently reported failures. This article describes Nooks, a reliability subsystem that seeks to greatly enhance operating system (OS) reliability by isolating the OS from driver failures. T ..."
Abstract
-
Cited by 314 (14 self)
- Add to MetaCart
(Show Context)
drivers remain a significant cause of system failures. In Windows XP, for example, drivers account for 85 % of recently reported failures. This article describes Nooks, a reliability subsystem that seeks to greatly enhance operating system (OS) reliability by isolating the OS from driver failures. The Nooks approach is practical: rather than guaranteeing complete fault tolerance through a new (and incompatible) OS or driver architecture, our goal is to prevent the vast majority of driver-caused crashes with little or no change to the existing driver and system code. Nooks isolates drivers within lightweight protection domains inside the kernel address space, where hardware and software prevent them from corrupting the kernel. Nooks also tracks a driver’s use of kernel resources to facilitate automatic cleanup during recovery. To prove the viability of our approach, we implemented Nooks in the Linux operating system and used it to fault-isolate several device drivers. Our results show that Nooks offers a substantial increase in the reliability of operating systems, catching and quickly recovering from many faults that would otherwise crash the system. Under a wide range and number of fault conditions, we show that Nooks recovers automatically from 99 % of the faults that otherwise cause Linux to crash.
Condor and the Grid
"... Since 1984, the Condor project has helped ordinary users to do extraordinary computing. Today, the project continues to explore the social and technical problems of cooperative computing on scales ranging from the desktop to the world-wide computational grid. In this chapter, we provide the history ..."
Abstract
-
Cited by 225 (37 self)
- Add to MetaCart
(Show Context)
Since 1984, the Condor project has helped ordinary users to do extraordinary computing. Today, the project continues to explore the social and technical problems of cooperative computing on scales ranging from the desktop to the world-wide computational grid. In this chapter, we provide the history and philosophy of the Condor project and describe how it has interacted with other projects and evolved along with the field of distributed computing. We outline the core components of the Condor system and describe how the technology of computing must reflect the sociology of communities. Throughout, we reflect on the lessons of experience and chart the course travelled by research ideas as they grow into production systems.
Application performance and flexibility on Exokernel systems
- In Proceedings of the Sixteenth ACM Symposium on Operating Systems Principles
, 1997
"... The exokernel operating system architecture safely gives untrusted software efficient control over hardware and software resources by separating management from protection. This paper describes an exokernel system that allows specialized applications to achieve high performance without sacrificing t ..."
Abstract
-
Cited by 208 (10 self)
- Add to MetaCart
(Show Context)
The exokernel operating system architecture safely gives untrusted software efficient control over hardware and software resources by separating management from protection. This paper describes an exokernel system that allows specialized applications to achieve high performance without sacrificing the performance of unmodified UNIX programs. It evaluates the exokernel architecture by measuring end-to-end application performance on Xok, an exokernel for Intel x86-based computers, and by comparing Xok’s performance to the performance of two widely-used 4.4BSD UNIX systems (Free-BSD and OpenBSD). The results show that common unmodified UNIX applications can enjoy the benefits of exokernels: applications either perform comparably on Xok/ExOS and the BSD UNIXes, or perform significantly better. In addition, the results show that customized applications can benefit substantially from control over their resources (e.g., a factor of eight for a Web server). This paper also describes insights about the exokernel approach gained through building three different exokernel systems, and presents novel approaches to resource multiplexing. 1
IO-Lite: A Unified I/O Buffering and Caching System
- ACM Transactions on Computer Systems
, 1997
"... This paper presents the design, implementation, and evaluation of IO-Lite, a unified I/O buffering and caching system. IO-Lite unifies all buffering and caching in the system, to the extent permitted by the hardware. In particular, it allows applications, interprocess communication, the filesystem, ..."
Abstract
-
Cited by 207 (14 self)
- Add to MetaCart
(Show Context)
This paper presents the design, implementation, and evaluation of IO-Lite, a unified I/O buffering and caching system. IO-Lite unifies all buffering and caching in the system, to the extent permitted by the hardware. In particular, it allows applications, interprocess communication, the filesystem, the file cache, and the network subsystem to share a single physical copy of the data safely and concurrently. Protection and security are maintained through a combination of access control and read-only sharing. The various subsystems use (mutable) buffer aggregates to access the data according to their needs. IO-Lite eliminates all copying and multiple buffering of I/O data, and enables various cross-subsystem optimizations. Performance measurements show significant performance improvements on Web servers and other I/O intensive applications. 1 Introduction This paper presents the design, the implementation, and the performance of IO-Lite, a unified I/O buffering and caching system. IO-Li...
Dynamic instrumentation of production systems
, 2004
"... Rights to individual papers remain with the author or the author's employer. Permission is granted for noncommercial reproduction of the work for educational or research purposes. This copyright notice must be included in the reproduced paper. USENIX acknowledges all trademarks herein. ..."
Abstract
-
Cited by 204 (0 self)
- Add to MetaCart
(Show Context)
Rights to individual papers remain with the author or the author's employer. Permission is granted for noncommercial reproduction of the work for educational or research purposes. This copyright notice must be included in the reproduced paper. USENIX acknowledges all trademarks herein.
Extensible security architecture for Java
- In Proceedings of the 16th ACM Symposium on Operating Systems Principles
, 1997
"... As the World Wide Web has been used to build increasingly complex applications, developers have been constrained by the Web’s static document model. “Active ” content can add simple animations to a page, but it can also transform the Web into a “platform ” for writing and distributing programs. A va ..."
Abstract
-
Cited by 200 (8 self)
- Add to MetaCart
As the World Wide Web has been used to build increasingly complex applications, developers have been constrained by the Web’s static document model. “Active ” content can add simple animations to a page, but it can also transform the Web into a “platform ” for writing and distributing programs. A variety of mobile code systems such as Java [Gosling et al.
Going beyond the sandbox: An overview of the new security architecture in the Java development kit 1.2
- IN PROCEEDINGS OF THE USENIX SYMPOSIUM ON INTERNET TECHNOLOGIES AND SYSTEMS
, 1997
"... This paper describes the new security architecture that has been implemented as part of JDK1.2, the forthcoming Java TM Development Kit. In going beyond the sandbox security model in the original release of Java, JDK1.2 provides fine-grained access control via an easily configurable security policy. ..."
Abstract
-
Cited by 181 (5 self)
- Add to MetaCart
(Show Context)
This paper describes the new security architecture that has been implemented as part of JDK1.2, the forthcoming Java TM Development Kit. In going beyond the sandbox security model in the original release of Java, JDK1.2 provides fine-grained access control via an easily configurable security policy. Moreover, JDK1.2 introduces the concept of protection domain and a few related security primitives that help to make the underlying protection mechanism more robust.
The Flask Security Architecture: System Support for Diverse Security Policies
- in Proceedings of The Eighth USENIX Security Symposium
, 1999
"... Operating systems must be flexible in their support for security policies, providing sufficient mechanisms for supporting the wide variety of real-world security policies. Such flexibility requires controlling the propagation of access rights, enforcing fine-grained access rights and supporting the ..."
Abstract
-
Cited by 169 (10 self)
- Add to MetaCart
(Show Context)
Operating systems must be flexible in their support for security policies, providing sufficient mechanisms for supporting the wide variety of real-world security policies. Such flexibility requires controlling the propagation of access rights, enforcing fine-grained access rights and supporting the revocation of previously granted access rights. Previous systems are lacking in at least one of these areas. In this paper we present an operating system security architecture that solves these problems. Control over propagation is provided by ensuring that the security policy is consulted for every security decision. This control is achieved without significant performance degradation through the use of a security decision caching mechanism that ensures a consistent view of policy decisions. Both fine-grained access rights and revocation support are provided by mechanisms that are directly integrated into the service-providing components of the system. The architecture is described through its prototype implementation in the Flask microkernelbased operating system, and the policy flexibility of the prototype is evaluated. We present initial evidence that the architecture’s impact on both performance and code complexity is modest. Moreover, our architecture is applicable to many other types of operating systems and environments. 1
Hardening COTS Software with Generic Software Wrappers
- IN PROCEEDINGS OF THE IEEE SYMPOSIUM ON SECURITY AND PRIVACY
, 1999
"... Numerous techniques exist to augment the security functionality of Commercial Off-The-Shelf (COTS) applications and operating systems, making them more suitable for use in mission-critical systems. Although individually useful, as a group these techniques present difficulties to system developers be ..."
Abstract
-
Cited by 155 (3 self)
- Add to MetaCart
Numerous techniques exist to augment the security functionality of Commercial Off-The-Shelf (COTS) applications and operating systems, making them more suitable for use in mission-critical systems. Although individually useful, as a group these techniques present difficulties to system developers because they are not based onacommon framework which might simplify integration and promote portability and reuse. This paper presents techniques for developing Generic Software Wrappers -- protected, non-bypassable kernel-resident software extensions for augmenting security without modi cation of COTS source. We describe the key elements of our work: our high-level Wrapper Definition Language (WDL), and our framework for configuring, activating, and managing wrappers. We also discuss code reuse, automatic management of extensions, a framework for system-building through composition, platform-independence, and our experiences with our Solaris and FreeBSD prototypes.
