89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
/*
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//@HEADER
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// ************************************************************************
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//
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// Kokkos v. 3.0
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// Copyright (2020) National Technology & Engineering
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// Solutions of Sandia, LLC (NTESS).
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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// the U.S. Government retains certain rights in this software.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the Corporation nor the names of the
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY NTESS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NTESS OR THE
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Questions? Contact Christian R. Trott (crtrott@sandia.gov)
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//
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// ************************************************************************
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//@HEADER
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*/
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#include <Kokkos_Core.hpp>
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#include <cstdio>
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int main(int argc, char* argv[]) {
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Kokkos::initialize(argc, argv);
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Kokkos::DefaultExecutionSpace::print_configuration(std::cout);
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if (argc < 2) {
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fprintf(stderr, "Usage: %s [<kokkos_options>] <size>\n", argv[0]);
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Kokkos::finalize();
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exit(1);
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}
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const long n = strtol(argv[1], nullptr, 10);
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printf("Number of even integers from 0 to %ld\n", n - 1);
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Kokkos::Timer timer;
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timer.reset();
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// Compute the number of even integers from 0 to n-1, in parallel.
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long count = 0;
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Kokkos::parallel_reduce(
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n, KOKKOS_LAMBDA(const long i, long& lcount) { lcount += (i % 2) == 0; },
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count);
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double count_time = timer.seconds();
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printf(" Parallel: %ld %10.6f\n", count, count_time);
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timer.reset();
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// Compare to a sequential loop.
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long seq_count = 0;
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for (long i = 0; i < n; ++i) {
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seq_count += (i % 2) == 0;
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}
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count_time = timer.seconds();
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printf("Sequential: %ld %10.6f\n", seq_count, count_time);
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Kokkos::finalize();
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return (count == seq_count) ? 0 : -1;
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}
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