Technological Overview of High-Performance Computing. Gerolf Ziegenhain - TU Kaiserslautern, Germany
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1 Technological Overview of High-Performance Computing Gerolf Ziegenhain - TU Kaiserslautern, Germany
2 Outline of This Talk Give a glance at the important technologies The most important stuff is mentioned at least... Provide keywords / directions for further reading
3 Where is the Bottleneck? Beowolf cluster Communication between nodes critical Algorithms / Problems to solve Look for good decomposition Parallel many algorithms many systems This talk: What technologies for building beowolf cluster do exist?
4 How to Share Resources What can be shared? Computation time Storage Administrative overhead Each participating group has to have at least one administrator to explain usage and to know the needs make design decisions! Critical technologies Hardware: interconnect of nodes Software: automatic fair-share
5 Part - Networking
6 Networking Technologies Various technologies existed in the last decade
7 Networking Backbone of a cluster Communication between nodes Experience: 90% of failures because of network trouble This talk: basic knowledge Different topologies Latency & throughput
8 Network Topologies How are the nodes connected? Wikipedia All-to-all communication fully connected Long ranged interactions with field approximation tree Storage with NAS station star GBit with switch provides: bus
9 Topologies of Switched Networks Simple switched Cheap All-to-all communication within one ring Bauke & Mertens, Springer 2005 Different rings possible Stacked switched All-to-all communication Limited bandwidth Fat tree Unlimited all-to-all communication ^
10 Latency Technology MD-step(N) SD-RAM MBit Ethernet GBit Ethernet Infiniband Myrinet SCI Latency (µs) 2.8 < Bandwidth (MB/s) >
11 Latency Critical parameter: latency RAM: fast, expensive Networking: slow, cheap expensive Look for good decomposition
12 Bandwidth Evaluation of trajectories (data in 50-GB-packets common for MD-simulations) Bandwidth also matters Know your needs!
13 Collisions of Packets? Different types collisions Packet transfer tolerance Persistent / blocking / non-blocking Point-point / broadcast / multicast Can your switch handle the load? Switch is essential to your performance! MPI is fragile At least with GBit: separate the networks
14 Channel Bonding Combine multiple (Gbit)-Channels Increased bandwidth (load balancing) Bandwidth ~#channels Fault tolerance Loss in latency <1% Algorithms for channel bonding XOR of MAC addresses ARP packets Dynamic link aggregation (802.3ad compliant switch)
15 IPMI / SOL IPMI = Intelligent Platform Management Interface Monitor hardware status BIOS access Reboot or Power on / off Serial Interface Vendors: Dell, HP, Intel, NEC SOL = Serial Over Lan Access serial port over LAN Only one cable infrastructure KVM-switch
16 Computer Architecture
17 Development of Architecture
18 Architecture Feynman 1960: Plenty of room at the bottom But: heat (power) diffusion problematic Paradigm change in CPU design Not possible: one big cpu Possible: many cpus Many processes in parallel Virtualization Parallel programming
19 Architecture Networking Latency RAM Latency networking Use as many CPU per node as possible But: overhead because only one memory! Network Topology, technology Price increases nonlinearly with #nodes Optimum changes with years... Price for multi-cpu mainboards Price for networking overhead Know your needs!
20 #CPUs
21 Software and System Management
22 Scripting Occurence Init-Scripts Cron Jobs Customization of software (most stuff written in BASH) Applications Monitoring (temperature, storage, CPU usage,...) Maintenance (logfiles, storage, users,...) Initialization (services, mounting storage,...) Job control (initialization, cleanup,...)
23 Which Scripting Languages Absolutely essential: Shell (/bin/sh & /bin/bash) awk&sed Python Optional Perl Shell (/bin/zsh) Good to know C
24 Queue System Objective Start / stop / monitor jobs Fair share (users / groups / university) Hard / soft limits of resources Job requirements Memory # cores Runtime Priority (can it be resumed?) Quickshots, long-term simulations Optimal usage of the hardware Transparent & fair end-user interface
25 How to Configure the Queue Properties of nodes Memory #cores Hdd space Architecture Priorities / rights (user, group) Different queues (priority, resources) Fair-share policies
26 How to Use the Queue Specify the requirements for a job Runtime #cores Memory Architecture Priority Create dependent jobs Evaluation Parameter scans Interactive jobs
27 Monitoring Performance What to monitor? Temperature Disk space / memory / cpu load Job queue Network traffic How to monitor? Automatic monitoring system Ganglia Multicast, webinterface, charts Manual monitoring vmstat, tcpdump logfiles
28 OpenSSH Secure SHell Idea: Point-to-Point Toolset Ssh, scp, sftp Key & hostbased authentification Features Tunneling ( VPN) Shell Copying files Mounting server on remote desktop (sshfs)
29 Parallel ssh Ssh: Secure, fast Point-to-point 1000*n seconds for i in node1...node1000; do ssh $i reboot;done Rgang Python script Parallel ssh sessions Tree structure of spawned ssh instances n seconds rgang nodes reboot Scales up to thousands of nodes
30 Nice to Have Syslog server Monitoring Snapshot of the virtualized system states Automatic installation server 2 min complete reinstall is doable
31 Storage
32 Storage Hardware Hard disk drive Invented 1954 State-of-the-art technologies Moore's law holds Parameters to consider Average lifetime Power consumption Heat diffusion Vendor specific Quality Compatibility with Linux / BSD
33 RAID Striping (Raid0) Mirroring (Raid1) Size, speed: ~N, 1 disk fail all broken Data security, reading speed increased Striping with distributed parity (Raid5) Size, speed: ~(N-1), 1 HDD may fail
34 RAID Software / Hardware? Little speed differences Software RAID works with all disk-controllers Hardware RAID: vendor specific format Consider Failure tolerance: hdd may break Total capacity of storage Create multiple storages? How to share the resources?
35 Storage Sharing NAS: export local (raid) filesystem over NFS size SAN: one hdd per node in rack size, speed
36 Distributed Storage NAS: slow in parallel access Solution: Store local data portions Custom solution with your code Parallel filesystems 1 hdd per node, combine all nodes to one big shared storage Glusterfs, coda, lustre, pvfs, xtreemfs... Licensing Installation effort Fault tolerance Performance?
37 HDF5 Hierarchical data format Use (python-)libraries for evaluation Advantages As fast as binary files, but much smaller (statistics in less than one second through 100GB data file) Include images, descriptions, axis labels, units etc in the same file Portable I/O libraries exist Seamless integration with MPI (support for output in slices)
38 Administration User management Core programs ssh NIS server Queue (Automatic job kill?) Storage: quota Allowed filesize Automatic deletion
39 Housing of the Cluster Nominal power consumption Rise with time Consider also power supply of cooling Power supplies Power may fail Influence of voltage peaks equalizer UPS for critical infrastructure Cooling Each W burned in a CPU heat
40 Thank you! Acknowledgement: Jan Janßen Prof. Dr. rer. nat. Herbert M. Urbassek
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