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function test119
%TEST119 performance tests for GrB_assign
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
fprintf ('test119:------------------- C(I,J) += scalar:\n') ;
[save save_chunk] = nthreads_get ;
chunk = 4096 ;
rng ('default') ;
n = 4000 ; ;
k = 3000 ;
% I.begin = 0 ;
% I.inc = 1 ;
% I.end = k-1 ;
I1 = randperm (k) ;
I0 = uint64 (I1) - 1 ;
ncores = feature_numcores ;
for dc = [2 0 1e-6 1e-5 1e-4 1e-3 1e-2 0.1 1]
if (dc == 2)
C0 = sparse (rand (n)) ;
else
C0 = sprand (n, n, dc) ;
end
% warmup
C1 = C0 ;
% C1 (1:k,1:k) = C1 (1:k,1:k) + pi ;
C1 (I1,I1) = C1 (I1,I1) + pi ;
fprintf ('\n--------------------------------------\n') ;
fprintf ('dc = %g nnz(C) %8.4f million\n', dc, nnz(C0)/1e6) ;
tic
C1 = C0 ;
% C1 (1:k,1:k) = C1 (1:k,1:k) + pi ;
C1 (I1,I1) = C1 (I1,I1) + pi ;
tm = toc ;
scalar = sparse (pi) ;
for nthreads = [1 2 4 8 16 20 32 40 64]
if (nthreads > 2*ncores)
break ;
end
if (nthreads > 1 && t1 < 0.01)
break ;
end
nthreads_set (nthreads, chunk) ;
C2 = GB_mex_assign (C0, [ ], 'plus', scalar, I0, I0) ;
tic
C2 = GB_mex_assign (C0, [ ], 'plus', scalar, I0, I0) ;
tg = toc ;
assert (isequal (C1, C2.matrix)) ;
if (nthreads == 1)
t1 = tg ;
end
fprintf ('%3d : built-in: %10.4f GB: %8.4f ', nthreads, tm, tg) ;
fprintf (' speedup %10.4f %10.4f\n', tm / tg, t1/tg) ;
end
end
nthreads_set (save, save_chunk) ;
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