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function test292
%TEST292 test GxB_Vector_build_Scalar_Vector with a very large vector
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
% get the amount of memory available
q = '''' ;
if (ismac)
% Mac
cmd = sprintf ('memory_pressure | awk %s/The system has/ { print $4}%s', q, q) ;
[status, result] = system (cmd) ;
memory = str2double (result) ;
elseif (ispc)
% Windows: not supported
memory = 0 ;
else
% Linux
cmd = sprintf ('cat /proc/meminfo | awk %s/MemTotal/ { print $2}%s', q, q) ;
[status, result] = system (cmd) ;
memory = str2double (result) * 1024 ;
end
% this test takes about 16*n bytes of memory
n = 5e9 ;
if (memory > n * 16)
[nth chunk] = nthreads_get ;
nthreads_set (8) ;
GB_mex_burble (1) ;
X = ones (n, 1, 'int8') ;
s = int8 (3) ;
op.opname = 'plus' ;
op.optype = 'int8' ;
desc.rowindex_list = 'use_indices' ;
V = GB_mex_Vector_build (X, s, n, op, 'int8', desc) ;
assert (nnz (V.matrix) == n)
assert (size (V.matrix,1) == n) ;
assert (min (V.matrix) == 3) ;
assert (max (V.matrix) == 3) ;
nthreads_set (nth, chunk) ;
GB_mex_burble (0) ;
fprintf ('test292: all tests passed\n') ;
else
fprintf ('test292: skipped\n') ;
end
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