By Ian N. Dunn
Despite 5 a long time of analysis, parallel computing continues to be an unique, frontier know-how at the fringes of mainstream computing. Its much-heralded overcome sequential computing has but to materialize. this can be even if the processing wishes of many sign processing purposes proceed to eclipse the services of sequential computing. The offender is basically the software program improvement atmosphere. basic shortcomings within the improvement atmosphere of many parallel desktop architectures thwart the adoption of parallel computing. most well known, parallel computing has no unifying version to appropriately are expecting the execution time of algorithms on parallel architectures. expense and scarce programming assets restrict deploying a number of algorithms and partitioning recommendations in an try and locate the quickest answer. therefore, set of rules layout is basically an intuitive artwork shape ruled via practitioners who specialise in a selected computing device structure. This, coupled with the truth that parallel machine architectures hardly ever last longer than a few years, makes for a fancy and difficult layout environment.
To navigate this surroundings, set of rules designers desire a street map, a close approach they could use to successfully boost excessive functionality, moveable parallel algorithms. the focal point of this e-book is to attract one of these highway map. The Parallel set of rules Synthesis technique can be utilized to layout reusable construction blocks of adaptable, scalable software program modules from which excessive functionality sign processing functions should be built. The hallmark of the process is a semi-systematic technique for introducing parameters to regulate the partitioning and scheduling of computation and conversation. This enables the tailoring of software program modules to take advantage of diverse configurations of a number of processors, a number of floating-point devices, and hierarchical thoughts. To exhibit the efficacy of this strategy, the ebook offers 3 case reviews requiring numerous levels of optimization for parallel execution.
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Extra resources for A Parallel Algorithm Synthesis Procedure for High-Performance Computer Architectures
Thus, 4>~+ 1 - 4>~+i :::; 1. = 4>;-1 + 1 and r: = r:- 1 then 4>;+1 ""'s ,,",8-1 'f'p+1 - 'f'p+1 4>~+i :::; 1. > 1. 1!. 3, this leads to a contradiction. i :::; 1. For asynchronous message passing, the communication strategy is defined by the following procedure to manage the asynchronous send and receive operations. 56 PARALLEL ALGORITHM SYNTHESIS PROCEDURE Procedure: AP (Asynchronous Message Passing) Step 1: If 1 < r then compute 'Y: = else set 'Y:+1 else set 2)(h~ + wp) -(r - 2)(wp + 1) min(O, ¢: - ¢:-1 - 1) 'Y1 = Step 2: If r s + (¢~ - min(m - + wp, m + 1); 1
'Y:+1 > 'Y:+i receive rows then receive rows b: : 'Y:- 1 - 1] from ['Y:+i : 'Y:+1 -1] from Step 9: Stop b:+i : 'Y:+1 - Step 10: If r from r + 1 =1= P and 'Y:+1 > 'Y:+i then receive rows Step 11: If r r-1 =1= 1 and Step 12: If r r+1 =1= P and 'Y:+t > 1':+1 then send rows [1':+1 : 1':+i - 1J to Step 13: If r =1= 1 and 'Y: < 'Y:- 1 then receive rows 'Y:- 1 < 'Y: then send rows 1] ['Y: : 'Y:- 1 - 1] from b:- 1 : 'Y: - 1J to r - 1 Step 14: Stop A new asynchronous message passing version of the PPG algorithm is presented below.
3 for the case m = 13 and n = 10. Any path through the graph that does not violate the dependencies and traverses each rotation once and only once will possess the same numerical properties as the SFG algorithm. These dependency relationships and the corresponding dependency graph can also be used to describe the SG algorithm. 2. Householder-based Solution Procedures Central to the Householder-based solution procedures are Householder reflections. Ifw E Cmx1 , wHw > 0, and T = -2/(w Hw), then a Householder reflection is defined as a matrix H = I + TWW H.
L,j+l -: Xi,j+l ] + al(z, Z - I,J) Xi,j+l 35 Review of Matrix Factorization 2 3 4 5 6 7 8 9 10 II 12 I3 2 Figure 4-4. 3 4 5 6 7 SFG ordering for the case m 8 9 IO } = 13 and n = 10. +1 + ~2(i, i - 1,j) xi,HI (Y2(Z, Z - 1,J) Xi-I,HI + Xi,j+l ] for a "type 2" fast Givens rotation. The appropriate type of rotation is chosen to minimize the growth in the entries of D and X. The algorithm is presented below: Algorithm: SFG (Standard Fast Givens QR Factorization) Input(A) AO=A [m, n] = dimensions(AO) k=O 36 PARALLEL ALGORITHM SYNTHESIS PROCEDURE For j = 1 to min(m - For i = m to j 1, n) + 1 by -1 If Af,j =I 0 and ALl,j =I 0 then use Eqs.