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SOS Workshop 2000 Interconnect Technology Session

SOS Workshop 2000 Interconnect Technology Session. Tnet. Roland Paul Supercomputing Systems AG. Tnet Switch: Technical data. 12 port full crossbar switch 100 + 100 MB/s per link (MPI data) Micropackets (max. 128 Bytes) 64k computational nodes Very low error rate (BER <10 -19 )

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SOS Workshop 2000 Interconnect Technology Session

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  1. SOS Workshop 2000 Interconnect Technology Session Tnet Roland Paul Supercomputing Systems AG

  2. Tnet Switch: Technical data • 12 port full crossbar switch • 100 + 100 MB/s per link (MPI data) • Micropackets (max. 128 Bytes) • 64k computational nodes • Very low error rate (BER <10-19) • Multicast routing • Any topology possible (switch prevents deadlocks) • Remote configurable • Network performance monitoring

  3. Tnet Features • Reliability • The T-Net retransmission protocol • Performance • MPI multicast on the network • Address translation on NIC • micropackets • Flexibility • Any Network topology possible • Expandability • Standard electrical to optical Adapters • Remote managebility • Switch can be updated and configured remotely • One communication subsystem • MPI and Hardware developed together

  4. Gigabit Transmission Transmission Data Received Data Buffer Buffer CRCC Buffer Controller Buffer Controller Virtual backchannel for Acknowledges or Retransmission commands Tnet retransmission protocol

  5. Swiss-T1 Baby • Reliability: • Installed: August 99 • Accepted: October 99 • Crashes since acc.: 0 • unscheduled downtime: 0 % • Performance: • MPI bandwidth: 50 MB/s • MPI latency: 20 s • The application performance measured was equal to CPlant/Siberia and close to Quadrics/AlphaServer SC

  6. Swiss-T1: Current Tnet machine • 64 21264@500MHz • 32 GB Main Memory • 32 Bit TNet NIC: • 75 MB/s • 18 s • 64 Bit TNet NIC: • 180 MB/s bidir. • 13 s

  7. Tnet Expandability Plug and play electrical to optical interface (MIA)

  8. Tnet Remote managebility Terminal server Powerswitch Tnet Switch

  9. Tnet Summary • A high reliability of the Tnet HW and SW was shown on the Swiss-T1 Baby • The Application performance in Swiss-T1 Baby is comparable to other clusters • The Network performance of Swiss-T1 with Tnet64 NIC will be 300% higher than Baby • MPI implementation verified with Intel suite • Going optical is easy and relatively inexpensive • The network topologies with rings are allowed and actually work

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