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Issues of HPC software

Issues of HPC software. ——From the experience of TH-1A. Lu Yutong NUDT. TH-1A system. Installed in NSCC-TJ, Aug. 2010 Hybrid MPP structure: CPU & GPU Custom software stack Peak performance 4.7Pflop/s, Linpack 2.566PFlop/s, No.1Top500

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Issues of HPC software

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  1. Issues of HPC software ——From the experience of TH-1A Lu Yutong NUDT

  2. TH-1A system Installed in NSCC-TJ, Aug. 2010 Hybrid MPP structure: CPU & GPU Custom software stack Peak performance 4.7Pflop/s, Linpack 2.566PFlop/s, No.1Top500 Power consumption 4.04MW(635.15MF/W), No.11Green500

  3. Hardware • 4 kinds of nodes, 2 sets of network • Custom cabinet • Water cooling system • 3 kinds of LSI chips • CPU: FT-1000(PSoC) • High radix router ASIC：NRC • Network interface ASIC：NIC • 15 kinds of PCB boards

  4. TH-1A software Software stack

  5. What’s the point • Customization • Optimization Oriented to the system architecture

  6. Operating system • Kylin Linux • compute node kernel • Provide virtual running environment • Isolated running environments for different users • Custom software package installation • QoS support • Power aware computing

  7. Glex communicating system • Proprietary Interconnection based on high radix router • High bandwidth packet and RDMA communication • Zero copy user space RDMA • MPI base on GLEX: Bandwidth 6.3GB/s • Accelerate collective operation with hardware support in communication interface • Fault tolerance • Rapid error detection in large scale interconnection • Rebuild communication links

  8. Resource management system • Resource management, job scheduler • Heterogenous resources management and topology-aware scheduling • Large scale parallel job launcher (custom) • Improve system structure, optimized protocol, network performance, file system performance • logN, klogN • System power management • Automatic CR supporting • Accounting Enhance

  9. Global parallel file system • Object storage architecture (Lustre based) • Capacity: 2 PB, Scalability • Performance: Collective BW • Optimized file system protocol over proprietary interconnection network • Confliction release for concurrency accessing • Fine-grain distributed file lock mechanism • Optimized file cache policy • Reliability enhancement • Fault tolerance of network protocol • Data objects placement • Soft-raid

  10. Compiler system • C, C++, Fortran, Java • OpenMP, MPI, OpenMP/MPI • CUDA, OpenCL • Heterogeneous programming framework • Accelerate the large scale, complex applications, • Use the computing power of CPUs and GPUs, hide the GPU programming to users • Inter-node homogeneous parallel programming (users) • Intra-node heterogeneous parallel computing (experts)

  11. Compiler Optimized • Accelerating HPL (MPI(custom)+OpenMP+Cuda) • Adaptive partition ● Asynchronous data transfer • Software pipeline ● Affinity scheduling ● Zero-copy

  12. Programming environment • Virtual running environments • Provide services on demand • Parallel toolkits • Based on Eclipse • To integrate all kinds of tools • Editor, debugger, profiler • Work flow support • Support QoS negotiate • Reservation

  13. Nowadays • Our principle • Practicality and Usability • HPC system software • Mature technology，correctness and functionality • Optimizing technology，increase performance , scalarbility and reliability • Needs of new technology and theory

  14. Programming Language • Productive language • X10, Chapel, Fortress • Global Arrays, …… • MPI is still vitality • Compiler independence • Distributed features • MPI + sth

  15. Exascale computing • Hardware architecture • Many cores system • Nano-Photonics • System Software-- (Adaptive + Intelligent) • Extreme parallelism • Heterogenous computing • Fault-tolerant computing • Power management • Application software • Legacy codes supporting • Creative model

  16. Thank you！

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