MD-Bench/lammps/allocate.c

/*
 * =======================================================================================
 *
 *   Author:   Jan Eitzinger (je), jan.eitzinger@fau.de
 *   Copyright (c) 2020 RRZE, University Erlangen-Nuremberg
 *
 *   This file is part of MD-Bench.
 *
 *   MD-Bench is free software: you can redistribute it and/or modify it
 *   under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   MD-Bench is distributed in the hope that it will be useful, but WITHOUT ANY
 *   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 *   PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 *   details.
 *
 *   You should have received a copy of the GNU Lesser General Public License along
 *   with MD-Bench.  If not, see <https://www.gnu.org/licenses/>.
 * =======================================================================================
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <util.h>

void *allocate(int alignment, size_t bytesize) {
    int errorCode;
    void* ptr;

    errorCode = posix_memalign(&ptr, alignment, bytesize);
    if(errorCode == EINVAL) {
        fprintf(stderr, "Error: Alignment parameter is not a power of two\n");
        exit(EXIT_FAILURE);
    }

    if(errorCode == ENOMEM) {
        fprintf(stderr, "Error: Insufficient memory to fulfill the request\n");
        exit(EXIT_FAILURE);
    }

    if(ptr == NULL) {
        fprintf(stderr, "Error: posix_memalign failed!\n");
        exit(EXIT_FAILURE);
    }

    return ptr;
}

void *reallocate(void* ptr, int alignment, size_t newBytesize, size_t oldBytesize) {
    void *newarray = allocate(alignment, newBytesize);

    if(ptr != NULL) {
        memcpy(newarray, ptr, oldBytesize);
        free(ptr);
    }

    return newarray;
}

#ifndef CUDA_TARGET
void *allocate_gpu(int alignment, size_t bytesize) { return NULL; }
void *reallocate_gpu(void *ptr, int alignment, size_t newBytesize, size_t oldBytesize) { return NULL; }
#else
void *allocate_gpu(int alignment, size_t bytesize) {
    void *ptr;
    checkCUDAError("allocate_gpu", cudaMallocHost((void **) &ptr, bytesize));
    return ptr;
}

// Data is not preserved
void *reallocate_gpu(void *ptr, int alignment, size_t newBytesize, size_t oldBytesize) {
    void *newarray = allocate_gpu(alignment, newBytesize);

    if(ptr != NULL) {
        cudaFreeHost(ptr);
    }

    return newarray;
}
#endif