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gather_unroll.hpp
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gather_unroll.hpp
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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#include <Kokkos_Core.hpp>
#include <Kokkos_Random.hpp>
template <class Scalar>
struct RunGather<Scalar, UNROLL> {
static void run(int N, int K, int D, int R, int F) {
Kokkos::View<int**> connectivity("Connectivity", N, K);
Kokkos::View<Scalar*> A_in("Input", N);
Kokkos::View<Scalar*> B_in("Input", N);
Kokkos::View<Scalar*> C("Output", N);
Kokkos::Random_XorShift64_Pool<> rand_pool(12313);
Kokkos::deep_copy(A_in, 1.5);
Kokkos::deep_copy(B_in, 2.0);
Kokkos::View<const Scalar*, Kokkos::MemoryTraits<Kokkos::RandomAccess> > A(
A_in);
Kokkos::View<const Scalar*, Kokkos::MemoryTraits<Kokkos::RandomAccess> > B(
B_in);
Kokkos::parallel_for(
"InitKernel", N, KOKKOS_LAMBDA(const int& i) {
auto rand_gen = rand_pool.get_state();
for (int jj = 0; jj < K; jj++) {
connectivity(i, jj) = (rand_gen.rand(D) + i - D / 2 + N) % N;
}
rand_pool.free_state(rand_gen);
});
Kokkos::fence();
Kokkos::Timer timer;
for (int r = 0; r < R; r++) {
Kokkos::parallel_for(
"BenchmarkKernel", N, KOKKOS_LAMBDA(const int& i) {
Scalar c = Scalar(0.0);
for (int jj = 0; jj < K; jj++) {
const int j = connectivity(i, jj);
Scalar a1 = A(j);
const Scalar b = B(j);
#if (UNROLL > 1)
Scalar a2 = a1 * Scalar(1.3);
#endif
#if (UNROLL > 2)
Scalar a3 = a2 * Scalar(1.1);
#endif
#if (UNROLL > 3)
Scalar a4 = a3 * Scalar(1.1);
#endif
#if (UNROLL > 4)
Scalar a5 = a4 * Scalar(1.3);
#endif
#if (UNROLL > 5)
Scalar a6 = a5 * Scalar(1.1);
#endif
#if (UNROLL > 6)
Scalar a7 = a6 * Scalar(1.1);
#endif
#if (UNROLL > 7)
Scalar a8 = a7 * Scalar(1.1);
#endif
for (int f = 0; f < F; f++) {
a1 += b * a1;
#if (UNROLL > 1)
a2 += b * a2;
#endif
#if (UNROLL > 2)
a3 += b * a3;
#endif
#if (UNROLL > 3)
a4 += b * a4;
#endif
#if (UNROLL > 4)
a5 += b * a5;
#endif
#if (UNROLL > 5)
a6 += b * a6;
#endif
#if (UNROLL > 6)
a7 += b * a7;
#endif
#if (UNROLL > 7)
a8 += b * a8;
#endif
}
#if (UNROLL == 1)
c += a1;
#endif
#if (UNROLL == 2)
c += a1 + a2;
#endif
#if (UNROLL == 3)
c += a1 + a2 + a3;
#endif
#if (UNROLL == 4)
c += a1 + a2 + a3 + a4;
#endif
#if (UNROLL == 5)
c += a1 + a2 + a3 + a4 + a5;
#endif
#if (UNROLL == 6)
c += a1 + a2 + a3 + a4 + a5 + a6;
#endif
#if (UNROLL == 7)
c += a1 + a2 + a3 + a4 + a5 + a6 + a7;
#endif
#if (UNROLL == 8)
c += a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8;
#endif
}
C(i) = c;
});
Kokkos::fence();
}
double seconds = timer.seconds();
double bytes = 1.0 * N * K * R * (2 * sizeof(Scalar) + sizeof(int)) +
1.0 * N * R * sizeof(Scalar);
double flops = 1.0 * N * K * R * (F * 2 * UNROLL + 2 * (UNROLL - 1));
double gather_ops = 1.0 * N * K * R * 2;
printf(
"SNKDRUF: %i %i %i %i %i %i %i Time: %lfs Bandwidth: %lfGiB/s GFlop/s: "
"%lf GGather/s: %lf\n",
static_cast<int>(sizeof(Scalar) / 4), N, K, D, R, UNROLL, F, seconds,
1.0 * bytes / seconds / 1024 / 1024 / 1024, 1.e-9 * flops / seconds,
1.e-9 * gather_ops / seconds);
}
};