Embarrassingly parallel


In parallel computing, an embarrassingly parallel workload or problem also called perfectly parallel or pleasingly parallel is one where little or no effort is needed to separate the problem into a number of parallel tasks1 This is often the case where there is little or no dependency or need for communication between those parallel tasks, or for results between them2

Thus, these are different from distributed computing problems that need communication between tasks, especially communication of intermediate results They are easy to perform on server farms which lack the special infrastructure used in a true supercomputer cluster They are thus well suited to large, Internet-based distributed platforms such as BOINC, and do not suffer from parallel slowdown The opposite of embarrassingly parallel problems are inherently serial problems, which cannot be parallelized at all

A common example of an embarrassingly parallel problem is 3D video rendering handled by a graphics processing unit, where each frame forward method or pixel ray tracing method can be handled with no interdependency

Contents

  • 1 Etymology
  • 2 Examples
  • 3 Implementations
  • 4 See also
  • 5 References
  • 6 External links

Etymologyedit

"Embarrassingly" is used here in the same sense as in the phrase "an embarrassment of riches", meaning an overabundance—here referring to parallelization problems which are "embarrassingly easy"3 The term may also imply embarrassment on the part of developers or compilers: "Because so many important problems remain unsolved mainly due to their intrinsic computational complexity, it would be embarrassing not to develop parallel implementations of polynomial homotopy continuation methods"4 The term is first found in the literature in a 1986 book on multiprocessors by MATLAB's co-founder Cleve Moler,5 who claims to have invented the term6

An alternative term, pleasingly parallel, has gained some use, perhaps to avoid the negative connotations of embarrassment in favor of a positive reflection on the parallelizability of the problems: "Of course, there is nothing embarrassing about these programs at all"7

Examplesedit

Some examples of embarrassingly parallel problems include:

  • Distributed relational database queries using distributed set processing
  • Serving static files on a webserver to multiple users at once
  • The Mandelbrot set, Perlin noise and similar images, where each point is calculated independently
  • Rendering of computer graphics In computer animation, each frame or pixel may be rendered independently see parallel rendering
  • Brute-force searches in cryptography8 Notable real-world examples include distributednet and proof-of-work systems used in cryptocurrency
  • BLAST searches in bioinformatics for multiple queries but not for individual large queries 9
  • Large scale facial recognition systems that compare thousands of arbitrary acquired faces eg, a security or surveillance video via closed-circuit television with similarly large number of previously stored faces eg, a rogues gallery or similar watch list10
  • Computer simulations comparing many independent scenarios, such as climate models
  • Evolutionary computation metaheuristics such as genetic algorithms
  • Ensemble calculations of numerical weather prediction
  • Event simulation and reconstruction in particle physics
  • The marching squares algorithm
  • Sieving step of the quadratic sieve and the number field sieve
  • Tree growth step of the random forest machine learning technique
  • Discrete Fourier Transform where each harmonic is independently calculated
  • Convolutional neural networks running on GPUs

Implementationsedit

  • In R programming language – The Simple Network of Workstations SNOW package implements a simple mechanism for using a set of workstations or a Beowulf cluster for embarrassingly parallel computations11

See alsoedit

  • Amdahl's law defines value P, which would be almost or exactly equal to 1 for embarrassingly parallel problems
  • Map parallel pattern

Referencesedit

  1. ^ Herlihy, Maurice; Shavit, Nir 2012 The Art of Multiprocessor Programming, Revised Reprint revised ed Elsevier p 14 ISBN 9780123977953 Retrieved 28 February 2016 Some computational problems are “embarrassingly parallel”: they can easily be divided into components that can be executed concurrently 
  2. ^ Section 144 of: Foster, Ian 1995 "Designing and Building Parallel Programs" Addison–Wesley ISBN 9780201575941 Archived from the original on 2011-02-21 
  3. ^ Matloff, Norman 2011 The Art of R Programming: A Tour of Statistical Software Design, p347 No Starch ISBN 9781593274108
  4. ^ Leykin, Anton; Verschelde, Jan; Zhuang, Yan 2006 "Parallel Homotopy Algorithms to Solve Polynomial Systems" Proceedings of ICMS 2006 
  5. ^ Moler, Cleve 1986 Heath, Michael T, ed "Matrix Computation on Distributed Memory Multiprocessors" Hypercube Multiprocessors Society for Industrial and Applied Mathematics, Philadelphia ISBN 0898712092 
  6. ^ The Intel hypercube part 2 reposted on Cleve's Corner blog on The MathWorks website
  7. ^ Kepner, Jeremy 2009 Parallel MATLAB for Multicore and Multinode Computers, p12 SIAM ISBN 9780898716733
  8. ^ Simon, Josefsson; Colin, Percival August 2016 "The scrypt Password-Based Key Derivation Function" toolsietforg Retrieved 2016-12-12 
  9. ^ SeqAnswers forum
  10. ^ How we made our face recognizer 25 times faster developer blog post
  11. ^ Simple Network of Workstations SNOW package

External linksedit

  • Embarrassingly Parallel Computations, Engineering a Beowulf-style Compute Cluster
  • "Star-P: High Productivity Parallel Computing"


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