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相关概念视频

Multimachine Stability01:25

Multimachine Stability

198
Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
198
Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

680
Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
680
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

177
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
177
Maximum Power Transfer01:16

Maximum Power Transfer

293
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
293
Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

737
The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
737
Distributed Loads01:19

Distributed Loads

559
Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
For example, consider a bookshelf filled with books stacked vertically adjacent to each other. The weight of the books is evenly distributed over the length of the shelf. As a result, the pressure at different locations on the surface of the...
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相关实验视频

Updated: Jul 26, 2025

Quasi-light Storage for Optical Data Packets
07:45

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克服IOTLB墙壁的多个100Gbps的基于Linux的网络.

Alireza Farshin1, Luigi Rizzo2, Khaled Elmeleegy2

  • 1School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Kista, Sweden.

PeerJ. Computer science
|June 22, 2023
PubMed
概括
此摘要是机器生成的。

本研究涉及IOMMU对高速网络的性能影响. 在 Linux 内核中使用 hugepage 支持的缓冲器有效地消除了由 IOMMU 错误引起的吞吐量下降.

关键词:
在200 Gbps的速度下.拥抱页面 拥抱页面这就是IOMMU.IOTLBLB 公司在Linux内核中,包装处理 包装处理在 iPerf 中使用 iPerf.

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相关实验视频

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科学领域:

  • 计算机科学 计算机科学
  • 系统工程 系统工程
  • 网络性能 网络性能

背景情况:

  • 高速网络 (200 Gbps) 由于输入/输出内存管理单元 (IOMMU) 的开销而面临性能下降.
  • IOMMU Translation Lookaside Buffer (IOTLB) 错过了显著影响吞吐量,导致现代英特尔Xeon和AMD EPYC处理器的吞吐量下降了20%.

研究的目的:

  • 调查和减轻与IOMMU相关的性能罚款在Linux内核中的高速网络流量.
  • 分析IOTLB的行为,并确定导致业绩瓶的因素.

主要方法:

  • 描述IOTLB行为及其对Intel Xeon可扩展和AMD EPYC平台200 Gbps的性能影响.
  • 为Linux网络设备驱动程序开发和评估一个巨大的页面意识内存分配器.
  • 对缓解策略的分析,重点是使用巨大的页面IOTLB条目.

主要成果:

  • 确定了导致IOTLB错误和吞吐量减少的关键因素.
  • 证明了巨额页面支持的缓冲器完全恢复了因IOMMU而失去的吞吐量.
  • 制定了指导方针,以帮助开发人员避免"IOTLB墙".

结论:

  • 支持HugePage的缓冲器是克服高速网络中的IOMMU诱导的性能限制的有效解决方案.
  • 在Linux内核中重新考虑I/O管理对于有效支持更高的数据速率至关重要.