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Web100 at SLAC

Web100 at SLAC. Presented at the Web100 Workshop, Boulder, CO, August 2002. Overview. Review Web100 at SLAC Applications Results IEPM-BW MAGGIE. The Needs of HENP. BOF in Nebraska. SLAC is a data center. Transfer multiple TeraBytes to France, UK.

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Web100 at SLAC

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  1. Web100 at SLAC Presented at the Web100 Workshop, Boulder, CO, August 2002.

  2. Overview • Review • Web100 at SLAC • Applications • Results • IEPM-BW • MAGGIE

  3. The Needs of HENP • BOF in Nebraska. • SLAC is a data center. • Transfer multiple TeraBytes to France, UK. • Need to optimally configure ftp-like applications to maximize throughput. • Track loss, RTT, throughput. • Modify streams and window size.

  4. Expectations • Take out the guess work • Maintain optimal parameters • Improve throughput

  5. Web100 at SLAC • Initial test and development machines. • Two main ‘production’ machines • Antonia, Hercules • Other testbed machines are web100-enabled by default. • Utilize Net100 extensions and turn off 2.4 caching.

  6. Application • webdump (tcpdump-like) program • Iperf • Short transfers dominated by slow start • Modify iperf to use web100 to identify when slow start has finished and report throughput

  7. Results • iperf vs web100 vs passive (netflow) • Stream by stream for a whole transfer • Not progressive

  8. Issues • Dynamically select CID • What is interesting ? • Real-time • Streams and Windows prediction

  9. IEPM-BW • Continuously operating high performance throughput measurement project. • Poor mans AIME (not funded by SciDAC). • Iperf, bbcp, bbftp, udpmon … • Track, compare, contrast • 3 Monitoring Sites (SLAC, FNAL, UMan) • I2, UMich, NIKHEF, APAN/JP • 33 Active Participants (US, Europe, Japan)

  10. IEPM-BW and WEB100 • Option to dump subset of stats to a file • Not default

  11. MAGGIE • Measurement and Analysis for the Global Grid and Internet End-to-end Performance. • Big sister of Active Internet Monitoring for ESnet (AIME). • 10-20+ NIMI hosts running periodic and on-demand measurements. • Feedback results to instrument tools and troubleshoot issues.

  12. MAGGIE+ • Atlas • Internet2 • Performance Analysis Stations • I2 E2E PI PE • PPDG • Work with these and others to create co-operative framework • Continue IEPM-BW work.

  13. Details • http://www-iepm.slac.stanford.edu • http://www-iepm.slac.stanford.edu/maggie • http://www-iepm.slac.stanford.edu/bw • http://www-iepm.slac.stanford.edu/bw/iperf_res.html

  14. Any Questions ?

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