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function test247
%TEST247 test GrB_mxm (for GB_AxB_saxpy3_fineHash_phase2.c)
%
% This tests the "if (hf == i_unlocked) // f == 2" case in the last block of
% code in GB_AxB_saxpy3_fineHash_phase2.c. The test is nondeterministic so
% it the test coverage might vary, or even be zero. See also test246.m.
% It is thus run many times.
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
rng ('default') ;
fprintf ('test247: testing of GB_AxB_saxpy3_fineHash_phase2.c\n') ;
for trial = 1:40
n = 1000000 ;
A.matrix = sparse (n, n) ;
B.matrix = sprand (n, 1, 0.01) ;
A.matrix (1:100, 1:100) = sprand (100, 100, 0.4) ;
S = sparse (n, 1) ;
semiring.multiply = 'times' ;
semiring.add = 'plus' ;
semiring.class = 'double' ;
[nth chk] = nthreads_get ;
desc.axb = 'hash' ;
nthreads_set (16, 1) ;
C1 = GB_mex_mxm (S, [ ], [ ], semiring, A, B, desc) ;
C2 = A.matrix * B.matrix ;
err = norm (C1.matrix - C2, 1) ;
assert (err < 1e-12) ;
nthreads_set (nth, chk) ;
fprintf ('.') ;
end
fprintf ('\ntest247: all tests passed\n') ;
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