Análisis de la reducción del consumo de ancho de banda de un ISP mediante el estudio de Servidor Web Proxy Cache

Introducción, el consumo de ancho de banda es un recurso valioso en las empresas hoy en día, la necesidad de mejorar constantemente los tiempos de respuesta en las solicitudes de los servicios web ha provocado que se busquen medios eficientes que cumplan con los requerimientos de la red, disminuyendo el ancho de banda que se consume. Objetivo, analizar la reducción del consumo de ancho de banda de un ISP mediante el estudio de Servidor Web Proxy Cache para la empresa FASTNET CIA. LTDA. Metodología, el diseño de la investigación fue cuantitativa. Se realizó un análisis de la red TELCO aplicando la Metodología Integral para Redes Avanzadas (MIRA) obteniendo así sus fortalezas y debilidades. Consecuentemente se estudiaron diferentes opciones de servidores web proxy caché, entre ellos: HAARPCACHE, RAPTOR CACHE, SQUID, THUNDERCACHE, ampliando el abanico de opciones para una implementación adecuada. se configuraron tres escenarios; el primero basa su estructura en el nodo “Nat Langos AS” sin ninguna variante, el segundo escenario se diferenció por tener incorporado el servidor HAARPCACHE instalado sobre el servidor HP Proliant dl-385P y el tercero cambia el servidor por RAPTOR CACHE implementado en el mismo ordenador. Resultados, el servidor HAARPCACHE cumplió en un 90% de dichas condiciones y provocó un 17,86% de ahorro de ancho de banda empresarial, mientras que RAPTORCACHE cumplió con el 45% de las medidas y creó un ahorro correspondiente al 8,92%. Conclusiones, se concluye que el servidor más adecuado para FASTNET CIA. LTDA. por su fiabilidad y capacidad de ahorro es HAARPCACHE, además de una considerable reducción del ancho de banda mejorando así el performance de los usuarios.

Web Proxy Auto Discovery for Dynamically Created Web Proxies

The WLCG Web Proxy Auto Discovery (WPAD) service provides a convenient mechanism for jobs running anywhere on the WLCG to dynamically discover web proxy cache servers that are nearby. The web proxy caches are general purpose for a number of different http applications, but different applications have different usage characteristics and not all proxy caches are engineered to work with the heaviest loads. For this reason, the initial sources of information for WLCG WPAD were the static configurations that ATLAS and CMS maintain for the Conditions data that they read through the Frontier Distributed Database system, which is the most demanding popular WLCG application for web proxy caches. That works well for use at traditional statically defined WLCG sites, but now that usage of commercial clouds is increasing, there is also a need for web proxy caches to dynamically register themselves as they are created. A package called Shoal had already been created to manage dynamically created web proxy caches. This paper describes the integration of the Shoal package into the WLCG WPAD system, such that both statically and dynamically created web proxy caches can be located from a single source. It also describes other improvements to the WLCG WPAD system since the last CHEP publication.

A Framework to improve the Web Performance using Reorganization, Optimized Prediction and Prefetching

Improving web performance is becoming more hectic in recent days. This paperelucidates the combination of many ideas to improve web performance and given as a framework. The entire framework depicts various aspects in improving web access performance which includes website reorganization, webpage prediction and prefetching, optimized way of accessing prediction algorithm in webserver and finally improvements in a proxy cache at the time of accessing dynamic content. Each portion of the framework has been successfully proposed and implemented. The various algorithms have been introduced in each portion of the implementation. This research work not only introduced new algorithms but also create scope for further research works in terms of improving web performance.

Distributed proxy cache replacement algorithm to improve web server performance

The performance of web processing needs to increase to meet the growth of internet usage, one of which is by using cache on the web proxy server. This study examines the implementation of the proxy cache replacement algorithm to increase cache hits in the proxy server. The study was conducted by creating a clustered or distributed web server system using eight web server nodes. The system was able to provide increased latency by 90 % better and increased throughput of 5.33 times better.

Caching technologies for Tier-2 sites: A UK perspective

Pressures from both WLCG VOs and externalities have led to a desire to "simplify" data access and handling for Tier-2 resources across the Grid. This has mostly been imagined in terms of reducing book-keeping for VOs, and total replicas needed across sites. One common direction of motion is to increasing the amount of remote-access to data for jobs, which is also seen as enabling the development of administratively-cheaper Tier-2 subcat-egories, reducing manpower and equipment costs. Caching technologies are often seen as a "cheap" way to ameliorate the increased latency (and decreased bandwidth) introduced by ubiquitous remote-access approaches, but the usefulness of caches is strongly dependant on the reuse of the data thus cached. We report on work done in the UK at four GridPP Tier-2 sites - ECDF, Glasgow, RALPP and Durham - to investigate the suitability of transparent caching via the recently-rebranded XCache (Xrootd Proxy Cache) for both ATLAS and CMS workloads, and to support workloads by other caching approaches (such as the ARC CE Cache).