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Improving Network Performance in Computational Grid Applications Joel Daniels II Department of Computer Science University of New Hampshire

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What is a Grid Computing Application? Coupling of the applications and resources A virtual computer composed of geographically dispersed resources offers enormous computing power

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Why France? Padico GGrid Computing application provides support for multiple simultaneous message passing schemes PPoor performance over WAN! The VTHD ( Vraiment Tres Haut Debit ) Network

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Plan of Attack Why: TCP misinterpretation of packet loss over WAN Solution: Multiple parallel sockets to bypass problem (the network is not flooded) Approach: Control design to debug client-server application Padico Based client-server application to collect data

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Utilizing Multiple Parallel Sockets Conclusions: Increased performance with parallel sockets!!! No extra performance gained after obtain ceiling values. (towards 8.4) Extra overhead is added with the addition of each socket. Computations are lost in handling sockets. If no extra bandwidth gained the extra overhead will make performance drop.

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Additional Research TCP Send and Receive Buffer Sizes Message block sizes Different flags for send and recv, write, and read function calls Contention

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The Interns Amine of Morocco Let me give you a history lesson! Parikshit of India Nitin of India (Amine and moi)

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Working Atmosphere Inside the lab: Caf break 1 Caf break 2 work a bit Lunch Caf break 3 work some more Caf break 4

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The Smallest City With A Metro Rennes and the People: Their pride The crepes!

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Kings and Queens The Castles!

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Dizzying Heights The Alps!

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The City of Romance...and of course... PARIS! Where are all the berets?!?

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In the end......learned enough French to impress the ladies......became a preferred reader at CNN.com......and suffer from occasional cheese cravings. I survived...

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Cest la fin! Merci Beaucoup! Bonne soire!