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CNAF(Bologna): GARA

This document outlines the GARA test conducted in Padova on June 16, 2000, focusing on network resource reservation and allocation. The test explored multiple flow configurations, including bulk data transfers and competing flows, while utilizing Cisco 7500 and 7200 architectures. Key discussions addressed the effectiveness of the CPU scheduler, the Globus Resource Information Service, and integration of GARA with real applications. Evaluation tools like modified UDP traffic generators and TCP tests were employed to analyze performance under various conditions.

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CNAF(Bologna): GARA

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  1. CNAF(Bologna): GARA Globus Architecture for Reservation and Allocation

  2. Server Gara Test: Implementation CISCO 7500 CISCO 7200 sunlab3 sunlab2 VC 100 Mbps FE FE Client GARA API GARA Network Resource Manager Padova - 16 June 2000

  3. Gara Test: basic experiment • Multiple flow, network reservation: bulk data transfert (background flow) + competing best effort flow + foreground flows with immidiate allocation. • Multiple flow, network+CPU reservation. • Evaluation tools: UDP traffic generator (modified version of gen_send and gen_recv; MGEN/DREC) and modified version of ttcp. Padova - 16 June 2000

  4. Discussion (1): CPU scheduler • Is the CPU scheduler good for our needs? • Is the DSRT scheduler ready to be used with job submission? • When should I use it together with network reservation? • In which conditions (CPU architecture, platform,…) can I manage CPU reservations with Gara? Padova - 16 June 2000

  5. Discussion (2): Globus Resource Information Service • How can I search in the GRIS network resources? • After reservation successed, how is the GRIS updated? • collision in reservation request Padova - 16 June 2000

  6. Discussion (3): Gara&…what? • Has Gara been tested only with dedicated evaluation tools or also with “real” applications? • How can we use network resource reservation for our needs? In conjunction with data transfert ftp API? Padova - 16 June 2000

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