Summer 2007 ESCC/Internet2 Joint Techs Workshop

close
Use Internet2 SiteID

Already have an Internet2 SiteID?
Sign in here.

Internet2 SiteID

Wide Area Network Performance Analysis Methodology

Time 07/16/07 03:00PM-03:20PM

This livestream has concluded. The archive video will be posted here. Archives can take up to two weeks to be posted.

Session Abstract

The computing models for LHC experiments are globally distributed and grid-based. In such a computing model, the experiments' data must be reliably and efficiently transferred from CERN to Tier 1 regional centers, processed, and distributed to other centers around the world. Obstacles to good network performance arise from many causes and can be a major impediment to the success of this complex, multi-tiered data grid. Factors that affect overall network/application performance exist on the network end systems themselves (application software, operating system, hardware), in the local area networks that support the end systems, and within the wide area networks. Since the computer and network systems are globally distributed, it can be very difficult to locate and identify the factors that are hurting application performance. In this paper, we present an end-to-end network/application performance troubleshooting methodology developed and in use at Fermilab. The core of our approach is to narrow down the problem scope with a divide and conquer strategy. The overall complex problem is split into two distinct sub-problems: network end system diagnosis and tuning, and network path analysis. After satisfactorily evaluating, and if necessary resolving, each sub-problem, we conduct end-to-end performance analysis and diagnosis. The paper will discuss tools we use as part of the methodology. The long term objective of the effort is to enable end users to conduct much of the troubleshooting themselves, before (or instead of) calling upon network and end system "wizards", who are always in short supply.

Speakers

Speaker Wenji Wu Fermi National Accelerator Lab

Speaker Phil DeMar Fermi National Accelerator Lab

Speaker Mark Bowden Fermi National Accelerator Lab

Presentation Media

media item thumbnail Wide Area Network Performance Analysis Methodology (ppt)

Speaker Mark Bowden Fermi National Accelerator Lab

Speaker Phil DeMar Fermi National Accelerator Lab

Speaker Wenji Wu Fermi National Accelerator Lab