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// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
// SPDX-FileCopyrightText: Bradley M. Bell <bradbell@seanet.com>
// SPDX-FileContributor: 2003-22 Bradley M. Bell
// ----------------------------------------------------------------------------
/*
{xrst_begin time_test.cpp}
time_test: Example and test
###########################
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end time_test.cpp}
*/
// BEGIN C++
# include <cppad/utility/time_test.hpp>
# include <cppad/utility/vector.hpp>
namespace { // empty namespace
using CppAD::vector;
// used to check size
size_t size_;
// used to check repeat
size_t repeat_;
vector<double> a, b, c;
void test(size_t size, size_t repeat)
{ // used for check
size_ = size;
repeat_ = repeat;
// setup
a.resize(size);
b.resize(size);
c.resize(size);
size_t i = size;;
while(i)
{ --i;
a[i] = float(i);
b[i] = float(2 * i);
c[i] = 0.0;
}
// operations we are timing
while(repeat--)
{ i = size;;
while(i)
{ --i;
c[i] += std::sqrt(a[i] * a[i] + b[i] * b[i]);
}
}
}
}
bool time_test(void)
{ bool ok = true;
using CppAD::time_test;
// minimum amount of time to run test
double time_min = 0.5;
// size of first test case
size_t test_size = 20;
// run the first test case
size_t repeat_first;
double time_first = time_test(test, time_min, test_size, repeat_first);
ok &= size_ == test_size;
ok &= repeat_ == repeat_first;
ok &= time_min <= double(repeat_first) * time_first;
// size of second test case is twice as large
test_size = 2 * test_size;
// run the second test case
size_t repeat_second;
double time_second = time_test(test, time_min, test_size, repeat_second);
ok &= size_ == test_size;
ok &= repeat_ == repeat_second;
ok &= time_min <= double(repeat_second) * time_second;
// test above should hold without exception, one below might not
assert( ok );
// for this case, time should be linear w.r.t size
double rel_diff = 1. - 2. * time_first / time_second;
ok &= (std::fabs(rel_diff) <= .1);
if( ! ok )
std::cout << std::endl << "rel_diff = " << rel_diff << std::endl;
a.clear();
b.clear();
c.clear();
return ok;
}
// END C++
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