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function test121
%TEST121 performance tests for GrB_assign
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
fprintf ('test121:---------------- C(I,J)+=A performance\n') ;
[save save_chunk] = nthreads_get ;
chunk = 4096 ;
rng ('default') ;
n = 1e6 ;
k = n/10 ;
% I.begin = 0 ;
% I.inc = 1 ;
% I.end = k-1 ;
I1 = randperm (k) ;
I0 = uint64 (I1) - 1 ;
ncores = feature_numcores ;
for dc = [ 0 1e-6 1e-5 1e-4 ]
C0 = sprandn (n, n, dc) ;
for da = [ 0 1e-6 1e-5 1e-4 1e-3 ]
A = sprandn (k, k, da) ;
% warmup
C1 = C0 ;
C1 (1:k,1:k) = C1 (1:k,1:k) + A ;
fprintf ('\n--------------------------------------\n') ;
fprintf ('dc = %g, da = %g\n', dc, da) ;
tic
C1 = C0 ;
% C1 (1:k,1:k) = C1 (1:k,1:k) + A ;
C1 (I1,I1) = C1 (I1,I1) + A ;
tm = toc ;
for nthreads = [1 2 4 8 16 20 32 40 64]
if (nthreads > 2*ncores)
break ;
end
nthreads_set (nthreads, chunk) ;
if (nthreads > 1 && t1 < 0.01)
continue ;
end
C2 = GB_mex_assign (C0, [ ], 'plus', A, I0, I0) ;
tic
C2 = GB_mex_assign (C0, [ ], 'plus', A, I0, I0) ;
tg = toc ;
assert (isequal (C1, C2.matrix)) ;
if (nthreads == 1)
t1 = tg ;
end
fprintf ('%3d : builtin: %10.4f GB: %10.4f', nthreads, tm, tg) ;
fprintf (' speedup %10.4f %10.4f\n', t1/tg, tm / tg) ;
end
end
end
nthreads_set (save, save_chunk) ;
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