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Minimalist ’ s Linux Cluster

Minimalist ’ s Linux Cluster. Changyoung Choi, Jeonghyun Kim, Seyong Kim Department of Physics Sejong University. Reported in Lattice ’ 99. 1. Usual Linux cluster. Easy to build, use and maintain Off-The-Shelf everything! Ordinary PC ’ s Ordinary network components Free OS (Linux)

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Minimalist ’ s Linux Cluster

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  1. Minimalist’s Linux Cluster Changyoung Choi, Jeonghyun Kim, Seyong Kim Department of Physics Sejong University

  2. Reported in Lattice’99

  3. 1. Usual Linux cluster • Easy to build, use and maintain • Off-The-Shelf everything! • Ordinary PC’s • Ordinary network components • Free OS (Linux) • Free parallel programming environment (MPI)

  4. Room for improvement • Occupies too much space • Consumes too much power • Not all the components in an ordinary PC is necessary for computation • Possible further reduction in cost! • Possible reduction in power consumption • Supporting full bisection bandwidth is costly!

  5. Conditions • No custom-made hardwares • If it takes too long to develop -> no advantage • If there is, should be recyclable • Should be efficient enough • Should be do-able with small manpower

  6. 2. Construction(hardware) • Node • ATX size standard mother board • Intel Pentium IV-2.4 GHz • 512 Mbytes DDR SDRAM • 100 Mbps ethernet card (3+1) • 180W power • Cage for ATX size mother board • 1 front end server

  7. Price Includes Tax

  8. Software • WOW Linux 7.1 (equiv. RedHat 7.1) • Linux Terminal Server Project (LTSP) • Remote booting (DHCP + TFTP) • Diskless node system • 2-D mesh network configuration • Script developed in-house • MPI programming environment • MPICH/LAM

  9. Front end wait F-end send DHCP info send kernel using TFTP service send client file system by NFS Node 1 power-up NIC listens to DHCP server IP setup complete and download kernel setup file system on memory and copy NFS mounted file system to memory Setup

  10. Node 1 wait Node 1 send DHCP info Node 1 send kernel image Node 1 act as a pipe line between front end and node 2 for NFS Node 2 power-up NIC listens to node 1 DHCP server IP setup complete and download kernel from node 1 setup file system on memory and copy NFS mounted file system to memory Setup(continued)

  11. Parallel boot

  12. 3. Performance • 1-D ring full QCD code • Not suitable for 2-D mesh structure • 8^3 x 512 lattice

  13. 4. Discussion • recyclable • cabinet takes standard motherboard size -> replacing node is enough for a upgrade • occupies smaller foot-print, consumes less power • need to fine-tune • need to modify the code for 1-D ring to 2-D mesh

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