SmartIO

The large variety of compute-heavy and data-driven applications accelerate the need for a distributed I/O solution that enables cost-effective scaling of resources between networked hosts. For example, in a cluster system, different machines may have various devices available at different times, but moving workloads to remote units over the network is often costly and introduces large overheads compared to accessing local resources. To facilitate I/O disaggregation and device sharing among hosts connected using Peripheral Component Interconnect Express (PCIe) non-transparent bridges, we present SmartIO. NVMes, GPUs, network adapters, or any other standard PCIe device may be borrowed and accessed directly, as if they were local to the remote machines. We provide capabilities beyond existing disaggregation solutions by combining traditional I/O with distributed shared-memory functionality, allowing devices to become part of the same global address space as cluster applications. Software is entirely removed from the data path, and simultaneous sharing of a device among application processes running on remote hosts is enabled. Our experimental results show that I/O devices can be shared with remote hosts, achieving native PCIe performance. Thus, compared to existing device distribution mechanisms, SmartIO provides more efficient, low-cost resource sharing, increasing the overall system performance.

Comparison of 2.4 and 5 GHz WLAN Network for Purpose of Indoor and Outdoor Location

This paper presents comparison of prototype location system built with standard components of 2.4 and 5 GHz WLAN network infrastructure. The system can be used for personal or other objects’ positioning, both for indoor and outdoor environments. The system is local, i.e. its operational area is limited to WLAN network operating range. The system is based on standard and widely available WLAN components (access points, network adapters). The goal is to avoid any hardware and software modifications. Also position calculation should not be power hungry operation. Method of location is based in Received Signal Strength Indication (RSSI) returned by most of RF ICs (including WLAN). The main focus is research of how much accuracy (and usefulness) can be expected from standard WLAN hardware. Both static and dynamic scenarios have been tested and compared.

Slotted Carrier Sense Multiple Access Protocols- A Review

CSMA/CA protocols rely on the random deferment of packet transmissions. Like most other protocols, CSMA/CA was designed with the assumption that the nodes would play by the rules. This is important the nodes themselves control deferment. However, with the higher programmability of the network adapters, the temptation to tamper with the software or firmware is likely to grow; in this way, a user could obtain a much larger share of the available bandwidth at the expenseof other users. This paper focuses on slotted CSMA/CA and tries to find out its limitations of the slotted CSMA/CA protocols.

Network Development and Management

In the previous chapter, we investigated the technology requirements for an online teaching/learning system. Networks are one of the major components in an online teaching/learning system infrastructure. As mentioned earlier, an online teaching/ learning system is often constructed on a client-server structure. A network is used to link the tiers of the client-server structure. Through the network, the client side can send requests to the server side and get response from the server. A network consists of routers, switches, network adapters, modems, multiplexers, different types of transmission media, network protocols, and network management tools. There are different types of networks such as local area networks, wide area networks, Internet, and so on. Not only does an online teaching/learning system depend on a reliable and secure network infrastructure, many technology-based courses also use networks for hands-on practice.