this paper introduces the Warp Transactional Filesystem (WTF), a novel, transactional, POSIX-compatible filesystem based on a new file slicing API that enables efficient zero-copy file transformations. WTF provides tr...
ISBN:
(纸本)9781931971294
this paper introduces the Warp Transactional Filesystem (WTF), a novel, transactional, POSIX-compatible filesystem based on a new file slicing API that enables efficient zero-copy file transformations. WTF provides transactional access spanning multiple files in a distributed filesystem. Further, the file slicing API enables applications to construct files from the contents of other files without having to rewrite or relocate data. Combined, these enable a new class of high-performance applications. Experiments show that WTF can qualitatively outperform the industry-standard HDFS distributed filesystem, up to a factor of four in a sorting benchmark, by reducing I/O costs. Microbenchmarks indicate that the new features of WTF impose only a modest overhead on top of the POSIX-compatible API.
We describe the design and implementation of Open vSwitch, a multi-layer, open source virtual switch for all major hypervisor platforms. Open vSwitch was designed de novo for networking in virtual environments, result...
ISBN:
(纸本)9781931971218
We describe the design and implementation of Open vSwitch, a multi-layer, open source virtual switch for all major hypervisor platforms. Open vSwitch was designed de novo for networking in virtual environments, resulting in major design departures from traditional software switching architectures. We detail the advanced flow classification and caching techniques that Open vSwitch uses to optimize its operations and conserve hypervisor resources. We evaluate Open vSwitch performance, drawing from our deployment experiences over the past seven years of using and improving Open vSwitch.
Many data center network (DCN) applications require explicit routing path control over the underlying topologies. this paper introduces XPath, a simple, practical and readily-deployable way to implement explicit path ...
ISBN:
(纸本)9781931971218
Many data center network (DCN) applications require explicit routing path control over the underlying topologies. this paper introduces XPath, a simple, practical and readily-deployable way to implement explicit path control, using existing commodity switches. At its core, XPath explicitly identifies an end-to-end path with a path ID and leverages a two-step compression algorithm to pre-install all the desired paths into IP TCAM tables of commodity switches. Our evaluation and implementation show that XPath scales to large DCNs and is readily-deployable. Furthermore, on our testbed, we integrate XPath into four applications to showcase its utility.
Disk images play a critical role in multi-tenant datacenters. In this paper, the first study of its kind, we analyze operational data from the disk imaging system that forms part of the infrastructure of the Emulab fa...
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ISBN:
(纸本)9781931971096
Disk images play a critical role in multi-tenant datacenters. In this paper, the first study of its kind, we analyze operational data from the disk imaging system that forms part of the infrastructure of the Emulab facility. this dataset spans four years and more than a quarter-million disk image loads requested by Emulab’s users. From our analysis, we draw observations about the nature of the images themselves (for example: how similar are they to each other?) and about usage patterns (what is the statistical distribution of image popularity?). Many of these observations have implications for the design and operation of disk imaging systems, including how images are stored, how caching is employed, the effectiveness of pre-loading, and strategies for network distribution.
With high throughput networks acquiring a crucial role in supporting data-intensive applications, a variety of data center network topologies have been proposed to achieve high capacity at low cost. While this work ex...
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ISBN:
(纸本)9781931971096
With high throughput networks acquiring a crucial role in supporting data-intensive applications, a variety of data center network topologies have been proposed to achieve high capacity at low cost. While this work explores a large number of design points, even in the limited case of a network of identical switches, no proposal has been able to claim any notion of optimality. the case of heterogeneous networks, incorporating multiple line-speeds and port-counts as data centers grow over time, introduces even greater complexity. In this paper, we present the first non-trivial upper-bound on network throughput under uniform traffic patterns for any topology with identical switches. We then show that random graphs achieve throughput surprisingly close to this bound, within a few percent at the scale of a few thousand servers. Apart from demonstrating that homogeneous topology design may be reaching its limits, this result also motivates our use of random graphs as building blocks for design of heterogeneous networks. Given a heterogeneous pool of network switches, we explore through experiments and analysis, how the distribution of servers across switches and the interconnection of switches affect network throughput. We apply these insights to a real-world heterogeneous data center topology, VL2, demonstrating as much as 43% higher throughput withthe same equipment.
this paper is concerned withthe non-fragile H-infinity filtering for a class of discrete-time networkedsystems with multiple communication delays. We model such a complex delay system as a switched system. For the f...
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ISBN:
(纸本)9781479928378
this paper is concerned withthe non-fragile H-infinity filtering for a class of discrete-time networkedsystems with multiple communication delays. We model such a complex delay system as a switched system. For the filtering implementation uncertainty, a stochastic variable is employed to describe the phenomenon of the randomly occurring filter gain change, and a norm bound is used to measure the change size. Withthe switched system theory and the stochastic system analysis, a new sufficient condition is obtained such that the filtering error system is exponentially stable in the mean square sense and achieves a prescribed H-infinity performance level. A numerical example is given to show the effectiveness of the proposed design.
this paper focuses on the development of distributed architecture control of an industrial robot. the hardware implementation of a closed loop controller via networked microcontrollers is presented. the developed desi...
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ISBN:
(纸本)9781479938667
this paper focuses on the development of distributed architecture control of an industrial robot. the hardware implementation of a closed loop controller via networked microcontrollers is presented. the developed design is a real time multi-tasking control law system. the control architecture is distributed in five microcontrollers with master slave scheme. the master unit is dedicated for the network management and the communication withthe user-interface. Each slave board focuses on the position control of the corresponding joint. An implementing embedded control for brushless motor is established. I2C protocol is implemented for the network management. A user- interface for monitoring and control is developed. the control is done through an usb communication assured with a compatible drivers on the three most popular platforms (windows, Linux and Mac OS).
With high throughput networks acquiring a crucial role in supporting data-intensive applications, a variety of data center network topologies have been proposed to achieve high capacity at low cost. While this work ex...
ISBN:
(纸本)9781931971096
With high throughput networks acquiring a crucial role in supporting data-intensive applications, a variety of data center network topologies have been proposed to achieve high capacity at low cost. While this work explores a large number of design points, even in the limited case of a network of identical switches, no proposal has been able to claim any notion of optimality. the case of heterogeneous networks, incorporating multiple line-speeds and port-counts as data centers grow over time, introduces even greater *** this paper, we present the first non-trivial upper-bound on network throughput under uniform traffic patterns for any topology with identical switches. We then show that random graphs achieve throughput surprisingly close to this bound, within a few percent at the scale of a few thousand servers. Apart from demonstrating that homogeneous topology design may be reaching its limits, this result also motivates our use of random graphs as building blocks for design of heterogeneous networks. Given a heterogeneous pool of network switches, we explore through experiments and analysis, how the distribution of servers across switches and the interconnection of switches affect network throughput. We apply these insights to a real-world heterogeneous data center topology, VL2, demonstrating as much as 43% higher throughput withthe same equipment.
this paper focuses on the development of distributed architecture control of an industrial robot. the hardware implementation of a closed loop controller via networked microcontrollers is presented. the developed desi...
详细信息
this paper focuses on the development of distributed architecture control of an industrial robot. the hardware implementation of a closed loop controller via networked microcontrollers is presented. the developed design is a real time multi-tasking control law system. the control architecture is distributed in five microcontrollers with master slave scheme. the master unit is dedicated for the network management and the communication withthe user-interface. Each slave board focuses on the position control of the corresponding joint. An implementing embedded control for brushless motor is established. I2C protocol is implemented for the network management. A user- interface for monitoring and control is developed. the control is done through an usb communication assured with a compatible drivers on the three most popular platforms (windows, Linux and Mac OS).
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