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function test26(longtests)
%TEST26 performance test for GxB_select
% SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
% SPDX-License-Identifier: Apache-2.0
fprintf ('\ntest26 ------------------------------performance of GxB_select\n') ;
[save_nthreads save_chunk] = nthreads_get ;
chunk = 4096 ;
nthreads = feature_numcores ;
nthreads_set (nthreads, chunk) ;
[~, ~, ~, ~, ~, select_ops] = GB_spec_opsall ;
if (nargin < 1)
longtests = 0 ;
end
if (longtests)
% ssget will be used
nprobs = 5 ;
else
nprobs = 3 ;
end
rng ('default') ;
dt = struct ('inp0', 'tran') ;
for probs = 1:nprobs
switch probs
case 1
A = sparse (200, 1, 0.1) ;
case 2
A = sparse (200, 100, 0.1) ;
case 3
A1 = spones (sprand (10, 10, 0.5)) ;
A2 = spones (sprand (10, 10, 0.5)) ;
A3 = sparse (10,10) ;
A4 = GB_mex_Matrix_eWiseAdd (A3, [], [], 'minus', A1, A2, [ ]) ;
A = A4.matrix ;
% GB_spok(A) will fail since it has intentional explicit zeros
case 4
A = sparse (rand (6000)) ;
case 5
Prob = ssget (2662) ;
A = Prob.A ;
end
[m n] = size (A) ;
fprintf ('\nProblem: m %d n %d nnz %d\n', m, n, nnz (A)) ;
Cin = sparse (m,n) ;
for k2 = 1:length(select_ops)
op = select_ops {k2} ;
fprintf ('%s:\n', op) ;
for k = [-m -floor(m/2) -50 -1 0 1 50 floor(n/2) n]
fprintf ('k: %10d ', k) ;
tic
C1 = GB_mex_select (Cin, [], [], op, A, k, []) ;
t1 = toc ;
fprintf ('GB: %10.6f ', t1) ;
C3 = 'none' ;
C2 = 'none' ;
switch (op)
case 'tril'
tic
C2 = tril (A,k) ;
t2 = toc ;
tic
C3 = GB_mex_tril (A, k) ;
t3 = toc ;
case 'triu'
tic
C2 = triu (A,k) ;
t2 = toc ;
tic
C3 = GB_mex_triu (A, k) ;
t3 = toc ;
case 'diag'
if (size (A,2) > 1)
tic
C2 = spdiags (spdiags (A,k), k, m, n) ;
t2 = toc ;
end
tic
C3 = GB_mex_diag (A, k) ;
t3 = toc ;
case 'offdiag'
if (size (A,2) > 1)
tic
C2 = A - spdiags (spdiags (A,k), k, m, n) ;
t2 = toc ;
end
tic
C3 = GB_mex_offdiag (A, k) ;
t3 = toc ;
case 'nonzero'
tic
C2 = A .* (A ~= 0) ;
t2 = toc ;
assert (isequal (1*C2,1*A)) ;
tic
C3 = GB_mex_nonzero (A) ;
t3 = toc ;
assert (isequal (1*C3,1*A)) ;
end
if (~ischar (C3))
fprintf (' %10.6f ', t3) ;
assert (isequal (C3, C1.matrix))
end
if (~ischar (C2))
fprintf ('builtin: %10.6f ', t2) ;
fprintf ('nnz: %10d speedup %5.2f ', nnz (C2), t2/t1) ;
if (~ischar (C3))
fprintf (' %5.2f ', t2/t3) ;
end
assert (isequal (1*C1.matrix, 1*C2))
end
fprintf ('\n') ;
end
end
end
ok = true ;
A = sparse (ones (4)) ;
try
C = GB_mex_select (A, [ ], [ ], 'tril', A, A, [ ]) ;
ok = false ;
catch me
fprintf ('\nexpected error: %s\n', me.message) ;
end
nthreads_set (save_nthreads, save_chunk) ;
fprintf ('test26: all tests passed\n') ;
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