1function test119 2%TEST119 performance tests for GrB_assign 3 4% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2021, All Rights Reserved. 5% SPDX-License-Identifier: Apache-2.0 6 7fprintf ('test119:------------------- C(I,J) += scalar:\n') ; 8 9[save save_chunk] = nthreads_get ; 10chunk = 4096 ; 11 12rng ('default') ; 13n = 4000 ; ; 14 15k = 3000 ; 16 17% I.begin = 0 ; 18% I.inc = 1 ; 19% I.end = k-1 ; 20 I1 = randperm (k) ; 21 I0 = uint64 (I1) - 1 ; 22 23ncores = feature ('numcores') ; 24 25for dc = [2 0 1e-6 1e-5 1e-4 1e-3 1e-2 0.1 1] 26 27 if (dc == 2) 28 C0 = sparse (rand (n)) ; 29 else 30 C0 = sprand (n, n, dc) ; 31 end 32 33 % warmup 34 C1 = C0 ; 35 % C1 (1:k,1:k) = C1 (1:k,1:k) + pi ; 36 C1 (I1,I1) = C1 (I1,I1) + pi ; 37 38 fprintf ('\n--------------------------------------\n') ; 39 fprintf ('dc = %g nnz(C) %8.4f million\n', dc, nnz(C0)/1e6) ; 40 tic 41 C1 = C0 ; 42 % C1 (1:k,1:k) = C1 (1:k,1:k) + pi ; 43 C1 (I1,I1) = C1 (I1,I1) + pi ; 44 tm = toc ; 45 46 scalar = sparse (pi) ; 47 48 for nthreads = [1 2 4 8 16 20 32 40 64] 49 if (nthreads > 2*ncores) 50 break ; 51 end 52 if (nthreads > 1 && t1 < 0.01) 53 break ; 54 end 55 56 nthreads_set (nthreads, chunk) ; 57 58 C2 = GB_mex_assign (C0, [ ], 'plus', scalar, I0, I0) ; 59 C2 = GB_mex_assign (C0, [ ], 'plus', scalar, I0, I0) ; 60 tg = grbresults ; 61 assert (isequal (C1, C2.matrix)) ; 62 if (nthreads == 1) 63 t1 = tg ; 64 end 65 66 fprintf ('%3d : MATLAB: %10.4f GB: %8.4f ', nthreads, tm, tg) ; 67 fprintf (' speedup %10.4f %10.4f\n', tm / tg, t1/tg) ; 68 69 end 70end 71 72nthreads_set (save, save_chunk) ; 73