Quadrics Network PPT
Quadrics Network PPT
This ppt contain Quadrics NetworkPPT power point presentation, slide show
1. Quadrics QsNet:
A network for Supercomputing Applications
2. Quadrics network is offering any process to any other process communication in zero time.
3. A Quadrics Supercomputer Network
Ultra low user process to user process latency
Highest possible (affordable?) compute communications ratio
Seamless scaling to many 1000s of nodes
Reliable data transfer
Mixed system and multiple user traffic on one network
5. QsNet’s contributions:
Integration of the virtual-address spaces.
Network fault detection and fault tolerance.
6. QsNet I Components:
Elan Network Interface
Global Virtual Memory
Network Fault Detection and Fault Tolerance
7. Improvements in QsNet II:
Increase in the processor performance
Increased link speed.
Enhancement in the adapter and switch functionality.
The bidirectional data communication speed can be increased to 1.3 Gbyte/s.
8. Qsnet components
9. Elan 4
10. Packet Generation
Elan4 performs master PCI-X read .
Node CPUs can issue writes directly.
For large messages, the Elan4 DMA engine can read from the PCI-X.
For small messages, Elan4 uses STEN processor.
11. Elan4 Command Queues
Up to 8000 command queues can be active at any one time.
No practical limit to the command queues that Elan4 device driver can allocate.
Command queues provide protected access to the Elan4 hardware.
12. Elan4 Command-queue model
13. Elite 4
14. Elite 4 Switch Component
•8 QsNetIIlinks ×2 virtual channels
•Broadcast to range of outputs
•Full automatic error detection / recovery
•Arbitration based on age of packet
•Two levels of priority
•Adaptive routing support
•Unblocked latency of ~20ns
•Trace route transaction for interrogating the network
15. Qs net physical link
16. Performance Evaluation Based on Coding
17. Performance Evaluation Based on Platforms
18. Improvements in QsNet III
QsNet III is a multi-stage switch network.
Elan4 is enhanced to Elan5. It has 2 adapters for routing.
The improved version of Elite takes less than 40 ns to route a packet.
HPC Specific Features of QsNet III
– Barrier and Broadcast
-Small Packet Support
Thunder an 4096-way Itanium II system at Lawrence Livermore National Laboratory, the most
powerful system in the US and the second most powerful system in the world.
Quadrics hardware and software is an integral part of many of the leading production HPC clusters.
*Full, pageable 64 bit virtual memory support
*Multiple, virtual, programmable network
*Ultra-low latency short messaging
*Optimized support for scalable global operations
*Ability to scale number of network connections
with number of CPUs for SMP nodes.
*Proven scalability to many 1000s of processors.
QsNet generations provide a high performance data
network for HPC apps.
Quadrics have increased link speeds significantly in each
Quadrics have enhanced both adapter and switch
No. of components required is reduced by using high
Cost and complexity of routing data is reduced.
Features such as h/w barrier and broadcast enhance the
applicability to HPC high end applications.
The Quadrics Network (QsNet): High-Performance
Clustering Technology- Fabrizio Petrini, Wu-chun Feng, Los
Alamos National Laboratory, IEEE Computer society, 2001.
QsNet II : Defining High-Performance Network Design- Jon
Beecroft, David Addison, Pacific Northwest National
Laboratory, IEEE Computer society, 2005, p.34 to p.47.
QsNet III an Adaptively Routed Network for High
Performance Computing, Duncan Roweth, Trevor Jones,
Quadrics Limited, Bristol, UK, IEEE Computer society, 2008,
p. 157 to p. 164.
23. Thank you
Last Updated on 05 May 2016