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function test91
%TEST91 test subref performance on dense vectors
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2020, All Rights Reserved.
% http://suitesparse.com See GraphBLAS/Doc/License.txt for license.
fprintf ('\n------------------------------ testing GB_mex_Matrix_subref\n') ;
[save save_chunk] = nthreads_get ;
chunk = 4096 ;
nthreads = feature ('numcores') ;
nthreads_set (nthreads, chunk) ;
ntrials = 10 ;
% addpath old
rng ('default')
n = 10 * 1e6 ;
A = sparse (rand (n,1)) ;
fprintf ('A is a sparse %d-by-1 vector, all nonzero\n', n) ;
F = full (A) ;
for ilen = [1 10 100 1000 10000 100000 1e6]
fprintf ('\n----- C(I) = A (I), I is random with length(I) = %d\n', ilen) ;
I = irand (1, n, ilen, 1) ;
I0 = uint64 (I-1) ;
tic
for trials = 1:ntrials
C1 = A (I) ;
end
tm = toc ;
fprintf ('MATLAB sparse: %g sec\n', tm) ;
tic
for trials = 1:ntrials
Cfull = F (I) ;
end
tf = toc ;
fprintf ('MATLAB full: %g sec\n', tf) ;
J0 = uint64 (0) ;
tic
for trials = 1:ntrials
C3 = GB_mex_Matrix_subref (A, I0, J0) ;
end
tg = toc ;
fprintf ('GraphBLAS: %g sec speedup %g\n', tg, tm/tg) ;
assert (isequal (C1, C3)) ;
end
fprintf ('\n----- C(:) = A (:)\n') ;
tic
for trials = 1:ntrials
C1 = A (:) ;
end
tm = toc ;
fprintf ('MATLAB: %g\n', tm) ;
tic
for trials = 1:ntrials
C3 = GB_mex_Matrix_subref (A, [ ], J0) ;
end
tg = toc ;
assert (isequal (C1, C3)) ;
fprintf ('GraphBLAS: %g sec speedup %g\n', tg, tm/tg) ;
F = full (A) ;
tic
for trials = 1:ntrials
C0 = F (:) ;
C0 (1) = 1 ; % make sure the copy gets done, not a lazy copy
end
tf = toc ;
fprintf ('\nMATLAB (full): %g\n', tf) ;
nthreads_set (save, save_chunk) ;
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