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function test135
%TEST135 reduce-to-scalar, built-in monoids with terminal values
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
fprintf ('test135: reduce to scalar\n') ;
rng ('default') ;
n = 10e6 ;
[save_nthreads, save_chunk] = nthreads_get ;
nthreads_max = feature_numcores
%-------------------------------------------------------------------------------
fprintf ('================== int32 min:\n') ;
X = rand (n,1) ;
X = (double (int32 (inf)) * X) - double (int32 (inf) / 2) ;
X = int32 (X) ;
X (n/2) = int32 (-inf) ;
s = int32 (inf) ;
tic
c0 = min (X) ;
tm = toc ;
fprintf ('built-in: %g sec\n', tm) ;
A.matrix = sparse (double (X)) ;
A.pattern = logical (spones (X)) ;
A.class = 'int32' ;
nthreads_set (1,1) ;
tic
c1 = GB_mex_reduce_to_scalar (s, [ ], 'min', A) ;
t1 = toc ;
assert (c1 == c0) ;
fprintf ('1 thread %g sec\n', t1) ;
for nth = 2:64
nthreads_set (nth,1) ;
tic
c2 = GB_mex_reduce_to_scalar (s, [ ], 'min', A) ;
t2 = toc ;
assert (c2 == c0) ;
% fprintf ('%d threads %g sec\n', nth, t2) ;
end
%-------------------------------------------------------------------------------
fprintf ('================== int8 min:\n') ;
X = rand (n,1) ;
X = (256 * X) - 128 ;
X = int8 (X) ;
s = int8 (inf) ;
tic
c0 = min (X) ;
tm = toc ;
fprintf ('built-in: %g sec\n', tm) ;
A.matrix = sparse (double (X)) ;
A.pattern = logical (spones (X)) ;
A.class = 'int8' ;
nthreads_set (1,1) ;
tic
c1 = GB_mex_reduce_to_scalar (s, [ ], 'min', A) ;
t1 = toc ;
assert (c1 == c0) ;
fprintf ('1 thread %g sec\n', t1) ;
nthreads_set (nthreads_max,1) ;
tic
c2 = GB_mex_reduce_to_scalar (s, [ ], 'min', A) ;
t2 = toc ;
assert (c2 == c0) ;
fprintf ('%d threads %g sec\n', nthreads_max, t2) ;
%-------------------------------------------------------------------------------
fprintf ('================== double min:\n') ;
X = sparse (rand (n,1)) ;
A.matrix = X ;
A.pattern = logical (spones (X)) ;
A.class = 'double' ;
tic
c0 = min (X) ;
tm = toc ;
fprintf ('built-in: %g sec\n', tm) ;
s = double (inf) ;
nthreads_set (1,1) ;
tic
c1 = GB_mex_reduce_to_scalar (s, [ ], 'min', A) ;
t1 = toc ;
assert (c1 == c0) ;
fprintf ('1 thread %g sec\n', t1) ;
nthreads_set (nthreads_max,1) ;
tic
c2 = GB_mex_reduce_to_scalar (s, [ ], 'min', A) ;
t2 = toc ;
assert (c2 == c0) ;
fprintf ('%d threads %g sec\n', nthreads_max, t2) ;
%-------------------------------------------------------------------------------
fprintf ('================== double sum:\n') ;
X = rand (n,1) ;
tic
c0 = sum (X) ;
tm = toc ;
fprintf ('built-in: %g sec (full)\n', tm) ;
X = sparse (X) ;
A.matrix = X ;
A.pattern = logical (spones (X)) ;
A.class = 'double' ;
tic
c0 = full (sum (X)) ;
tm = toc ;
fprintf ('built-in: %g sec (sparse)\n', tm) ;
s = double (inf) ;
nthreads_set (1,1) ;
tic
c1 = GB_mex_reduce_to_scalar (s, [ ], 'plus', A) ;
t1 = toc ;
assert (norm (c1 - c0) / norm (c0) < 1e-12) ;
fprintf ('1 thread %g sec\n', t1) ;
nthreads_set (nthreads_max,1) ;
tic
c2 = GB_mex_reduce_to_scalar (s, [ ], 'plus', A) ;
t2 = toc ;
assert (norm (c2 - c0) / norm (c0) < 1e-12) ;
fprintf ('%d threads %g sec\n', nthreads_max, t2) ;
%-------------------------------------------------------------------------------
nthreads_set (save_nthreads, save_chunk) ;
fprintf ('test135: all tests passed\n') ;
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