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| Shared Memory Architecture support So speedup gained by parallel execution can be given by: paraallel sequential T T S = In general, it is very rare to get linear speedup. As given by Amdahl's law, which effectively means http://www2.cs.uh.edu/~ayaz/Assets/UHFFT2SMP.pdf Offer Queue 0 100000 200000 300000 400000 500000 600000 700000 1 2 3 4 5 6 7 8 Clocks/8 Number of Processors Time to Schedule 1056 Tasks total execution linear speedup offer select ave. wasted http://www.cc.gatech.edu/ai/robot-lab/online-publications/euromicro.pdf task Results for Retail1 - 16 Neural Nodes 0 4 8 12 16 Number of Application Tasks 0 4 8 12 16 Parallel Speedup Linear speedup Data-partitioned sparse BSOM Data-partitioned BSOM Network-partitioned SOM http://www.research.ibm.com/dar/papers/pdf/scalableSOM.pdf Lecture 13: Multiprocessor 3: Measurements, Crosscutting Issues ... Measuring MP performance by linear speedup v. execution time ? " linear speedup " graph of perf as scale CPUs ? Compare best algorithm on each computer ? Relative speedup - run http://www.eecs.berkeley.edu/~yujia/714ca/lec/Lec13-multiproc3.pdf publications.csail.mit.edu main.dvi linear speedup http://publications.csail.mit.edu/lcs/pubs/pdf/MIT-LCS-TR-749.pdf Midterm: In Perspective What is a Good Speedup? ? Hopefully, S(n) > 1 ? Linear speedup: » S(n) = n » Parallel program considered perfectly scalable ? Superlinear speedup: » S(n) > n » Can this happen? http://www-csag.ucsd.edu/teaching/cse160s05/lectures/Lecture10.pdf Avoiding Communication in Linear Algebra Memory BW http://www.stanford.edu/group/mmds/slides2008/demmel.pdf Cut-And-Stitch: Efficient Parallel Learning of Linear Dynamical ... onlyalittle accuracy, due to the chain structure of LDS (also HMM), as shown in our experiments, which was our first goal. On the other hand, it yields almost linear speedup, which http://www.cs.cmu.edu/~leili/paralearn/li-kdd08.pdf SciDAC and the International Linear Collider Petascale Computing for ... T3P - Code has been improved to allow scalability to more than 1000 CPUs for a medium-size problem with close to linear speedup on NCCS's Phoenix Path to Petascale Simulation Track3P http://www.scidac.gov/Conference2006/presentations/k_ko_pres.pdf Map-Reduce for Machine Learning on Multicore Basically, we often achieve linear speedup in the number of cores. Section 6 concludes the paper. 2 Statistical Query and Summation Form Formulticore systems, Sutterand Larus[25]point http://www.cs.stanford.edu/people/ang/papers/nips06-mapreducemulticore.pdf A Library Hierarchy for Implementing Scalable Parallel Search ... Each can achieve linear speedup (defined below) for small numbers of processors, but they employ a master-slave paradigm withasingle central node queue. http://www.lehigh.edu/%7Etkr2/research/papers/JSC02.pdf Production HPC Clusters: State-of-the-Art Performance via a Bes This linear speedup is shown by the teal-blue line that connects the "x" in Figure 2. (Note that the near-exponential appearance of the linear speedup data in this figure is an http://www.infiniconsys.com/pdf/silverstorm_scali_cdadapco_white_paper.pdf Electromagnetics Computations Using the MPI Parallel Implementation of ... Our numerical results show significant linear speedup in filling the sparse impedance matrix. Using the 32-processors on the Beowulf cluster lead to achieve a 7.2 overall speedup while http://www.ece.neu.edu/info/architecture/publications/aces.pdf Room Synchronizations Locks) with 40% additional wait Linear Speedup * No Wait Linear Speedup * Wait Rooms * Wait Locks * Wait 0 5 10 15 20 25 30 0 50 100 150 200 250 300 350 400 Number of Processors Work (Elapsed Time in http://portal.acm.org/ft_gateway.cfm?id=378605&type=pdf&coll=ACM&dl=ACM&CFTOKEN=84098042 CS 575 Parallel Processing data dependent * Not all processors are always busy Remote data needs communication CS575 lecture 1 9 * Remote data needs communication * Memory wall PLUS Communication wall * Linear speedup http://www.cs.colostate.edu/~cs575dl/lects/lec1.pdf ECES 788 High Performance Computing that can be achieved on a parallel computer is s . ä Example: 80% of time in 1 set of loops, parallelize this section of the code and run on 32 processors, assuming linear speedup the http://www.ececs.uc.edu/~ktomko/HPC/Lecture_16.pdf Parallelism in a Main-Memory DBMS: The Performance of PRISMA/DB Also, it is concluded that observed linear speedup for small numbers of processors cannot always be extrapolated to larger numbers of processors. http://www.vldb.org/conf/1992/P521.PDF Fixed Time, Tiered Memory, and Superlinear Speedup Fixed Time, Tiered Memory, and Superlinear Speedup John L. Gustafson Ames Laboratory-USDOE Ames, IA 50011 Abstract In the problem size-ensemble size plane, fixed-sized and scaled http://www.scl.ameslab.gov/Publications/Gus/Superlinear/Superlinear.pdf /usr/genetic/Publications/ISUG95/paper 1 10 100 1 2 4 8 16 32 Speedup Number of Processors Global Communication Nearest Neighbor Communication Ring Communication Linear Speedup-34-33-32-31-30-29-28-27-26-25-24 1 2 4 8 16 32 Energy (kcal/mol) http://www.rose-hulman.edu/~merkle/Professional/Publications%20and%20Presentations/Others/1995%20ISUG.pdf Room Synchronizations Locks) with 40% additional wait Linear Speedup - No Wait Linear Speedup - Wait Rooms - Wait Locks - Wait 0 5 10 15 20 25 30 0 50 100 150 200 250 300 350 400 Number of Processors Work (Elapsed Time in http://www.aladdin.cs.cmu.edu/papers/pdfs/y2001/roomsyncr.pdf CS575 Parallel Processing S(n) = T 1 / T n * Linear speedup: S(n) = k.n CS575 lecture 5 3 Linear speedup: S(n) = k.n * Often used in the stricter sense: S(n) = n * Efficiency: E(n) = S(n) / n * Average utilization of http://www.cs.colostate.edu/~cs575dl/lects/lec5.pdf Parallel Database Systems: The Future of Database Processing or a ... Speedup and Scaleup The ideal parallel system demonstrates two key properties: (1) linear speedup: Twice as much hardware can perform the task in half the elapsed time, and (2) linear http://research.microsoft.com/%7Egray/papers/CacmParallelDB.pdf Research Engineers Advance Design of the International Linear Collider ... We could simultaneously run simulations providing coverage for hundreds of scenarios. As a result, we achieved a linear speedup in the turnaround time for this task. http://www.mathworks.com/mason/tag/proxy.html?dataid=10126&fileid=49868 Building Highly Available Database Applications with Geronimo and ... 1 www.continuent.org ©Continuent 2005 Emmanuel Cecchet | ApacheConUS 2005 Building Highly Available Database Applications with Geronimo and Derby Emmanuel Cecchet Chief architect http://www.continuent.org/uploads/sequoia/Resources/2005-12-14SequoiaApacheCon05US.pdf A multiprocessor architecture for Viterbi decoders with linear speedup ... A multiprocessor architecture for Viterbi decoders with linear speedup - Signal Processing, IEEE Transactions on http://www.eecg.toronto.edu/~gulak/papers/Feygin93a.pdf Parallel Database Systems: The Future of High Performance Database ... Speedup and Scaleup The ideal parallel system demonstrates two key properties: (1) linear speedup: Twice as much hardware can perform the task in half the elapsed time, and (2) linear http://pages.cs.wisc.edu/~dewitt/includes/paralleldb/cacm.pdf The Deduction Rule and Linear and Near-linear Proof Simulations A nested deduction Fregeproof system provides at mostanearly linear speedup over Fregesystem whereby\nearly linear"is meant the ratio of proof lengths is O ( fi ( n )) where fi is the http://www.math.ucsd.edu/~sbuss/ResearchWeb/prooflengths/paper.pdf Scheduling Parallel Jobs with Linear Speedup Scheduling Parallel Jobs with Linear Speedup Alexander Grigoriev and Marc Uetz Maastricht University, Quantitative Economics, P.O.Box 616,6200 MDMaastricht, The Netherlands. Email http://arno.unimaas.nl/show.cgi?fid=2859 Linear Speedup KSR1 results http://www-personal.umich.edu/~streak/papers/dga-icga95.pdf |
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