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snappy_iofilter.cu
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snappy_iofilter.cu
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <hdf5.h>
#include "snappy_cuda.h"
#include "snappy_compress.h"
#include "snappy_decompress.h"
#include "snappy_iofilter.h"
//
// Calculate the difference between two timeval structs. This symbol
// is needed by snappy_compress() and snappy_decompress().
//
double get_runtime(struct timeval *start, struct timeval *end) {
double start_time = start->tv_sec + start->tv_usec / 1000000.0;
double end_time = end->tv_sec + end->tv_usec / 1000000.0;
return (end_time - start_time);
}
enum init_state {
UNINITIALIZED = 0,
INITIALIZED_FOR_COMPRESSION,
INITIALIZED_FOR_DECOMPRESSION,
};
// The HDF5 I/O filter API doesn't let one pass a context around subsequent
// calls to the filter. The best we can do is to make the context buffers
// static to prevent excessive memory [de]allocations.
static struct host_buffer_context *input;
static struct host_buffer_context *output;
static struct program_runtime runtime;
static enum init_state init_state = UNINITIALIZED;
// The current HDF5 filter API doesn't provide hooks to both initialize
// and teardown a filter. We workaround that limitation by initializing
// the input/output contexts once and registering a callback with atexit()
// to destroy them once the calling program exits.
#define init_buffer(ctx, block_size) \
do { \
if (runtime.using_cuda && ! runtime.reuse_buffers) { \
checkCudaErrors(cudaMallocManaged(&ctx, sizeof(host_buffer_context))); \
memset(ctx, 0, sizeof(host_buffer_context)); \
} else if (! runtime.reuse_buffers) { \
ctx = (host_buffer_context *) calloc(1, sizeof(host_buffer_context)); \
} \
ctx->max = ULONG_MAX; \
ctx->block_size = block_size; \
} while (0)
static bool init_writer(int block_size, void *buf, size_t buf_size)
{
init_buffer(input, block_size);
init_buffer(output, block_size);
if (runtime.using_cuda) {
if (buf_size > input->max) {
fprintf(stderr, "Input buffer size is too big (%ld > %ld)\n",
buf_size, input->max);
return false;
}
input->length = buf_size;
input->total_size = ALIGN_LONG(input->length, 8) * sizeof(*(input->buffer));
if (! runtime.reuse_buffers) {
// Input buffer is provided by HDF5, but we need to copy that data to
// GPU memory too.
checkCudaErrors(cudaMallocManaged(&input->buffer, input->total_size));
}
input->curr = input->buffer;
// Initialize output buffer that will hold the compressed data,
// i.e.: output->buffer, output->curr, output->length
setup_compression_cuda(input, output, &runtime);
} else {
// Use the input buffer provided by HDF5
input->length = input->total_size = buf_size;
input->buffer = (uint8_t *) buf;
input->curr = input->buffer;
// Initialize output buffer
setup_compression(input, output, &runtime);
}
return true;
}
static bool init_reader(int block_size, void *buf, size_t buf_size)
{
init_buffer(input, block_size);
init_buffer(output, block_size);
if (runtime.using_cuda) {
// Initialize input buffer
if (buf_size > input->max) {
fprintf(stderr, "Input buffer size is too big (%ld > %ld)\n",
buf_size, input->max);
return false;
}
uint32_t total_size = ALIGN_LONG(buf_size, 8) * sizeof(*(input->buffer));
if (runtime.reuse_buffers && input->total_size < total_size) {
// cached input buffer is not large enough to hold new data
checkCudaErrors(cudaFree(input->buffer));
checkCudaErrors(cudaMallocManaged(&input->buffer, total_size));
input->total_size = total_size;
} else if (! runtime.reuse_buffers) {
checkCudaErrors(cudaMallocManaged(&input->buffer, total_size));
input->total_size = total_size;
}
input->length = buf_size;
input->curr = input->buffer;
memcpy(input->buffer, buf, buf_size);
// Initialize output buffer (output->buffer, output->curr, output->length)
setup_decompression_cuda(input, output, &runtime);
} else {
// Initialize input buffer
input->length = input->total_size = buf_size;
input->buffer = (uint8_t *) buf;
input->curr = input->buffer;
// Initialize output buffer
setup_decompression(input, output, &runtime);
}
return true;
}
static void atexit_callback()
{
if (input && output) {
terminate_compression(input, output, &runtime);
terminate_decompression(input, output, &runtime);
if (runtime.using_cuda) {
checkCudaErrors(cudaFree(input));
checkCudaErrors(cudaFree(output));
} else {
free(input);
free(output);
}
input = output = NULL;
}
}
static size_t filter_callback(unsigned int flags, size_t cd_nelmts,
const unsigned int *cd_values, size_t nbytes, size_t *buf_size, void **buf)
{
memset(&runtime, 0, sizeof(runtime));
char *use_cuda = getenv("SNAPPY_USE_CUDA");
runtime.using_cuda = (use_cuda && strcmp(use_cuda, "0") == 0) ? false : true;
char *user_block_size = getenv("SNAPPY_BLOCKSIZE");
int block_size = user_block_size ? atoi(user_block_size) : 32 * 1024;
if (flags & H5Z_FLAG_REVERSE) {
// Read path. Here we call the decompressor and update the output buffer
if (init_state == UNINITIALIZED) {
if (init_reader(block_size, *buf, *buf_size) == false)
return 0;
atexit(atexit_callback);
} else if (init_state == INITIALIZED_FOR_COMPRESSION) {
atexit_callback();
if (init_reader(block_size, *buf, *buf_size) == false)
return 0;
} else if (init_state == INITIALIZED_FOR_DECOMPRESSION) {
runtime.reuse_buffers = true;
if (init_reader(block_size, *buf, *buf_size) == false)
return 0;
}
init_state = INITIALIZED_FOR_DECOMPRESSION;
if (runtime.using_cuda) {
if (snappy_decompress_cuda(input, output, &runtime) != SNAPPY_OK) {
fprintf(stderr, "Failed to decompress input data on the GPU\n");
return 0;
}
if (*buf_size < output->length) {
// The buffer provided by HDF5 is not large enough to hold the
// decompressed data
char *newbuf = (char *) malloc(sizeof(char) * output->length);
if (! newbuf) {
fprintf(stderr, "Not enough memory to hold the decompressed data\n");
return 0;
}
free(*buf);
*buf = newbuf;
}
memcpy(*buf, output->buffer, output->length);
*buf_size = output->length;
} else {
if (snappy_decompress_host(input, output) != SNAPPY_OK) {
fprintf(stderr, "Failed to decompress input data\n");
return 0;
}
if (*buf_size < output->length) {
// The buffer provided by HDF5 is not large enough to hold the
// decompressed data
char *newbuf = (char *) malloc(sizeof(char) * output->length);
if (! newbuf) {
fprintf(stderr, "Not enough memory to hold the decompressed data\n");
return 0;
}
free(*buf);
*buf = newbuf;
}
memcpy(*buf, output->buffer, output->length);
*buf_size = output->length;
}
} else {
// Write path. Here we call the compressor and update the output buffer
if (init_state == UNINITIALIZED) {
if (init_writer(block_size, *buf, *buf_size) == false)
return 0;
atexit(atexit_callback);
} else if (init_state == INITIALIZED_FOR_DECOMPRESSION) {
atexit_callback();
if (init_writer(block_size, *buf, *buf_size) == false)
return 0;
} else if (init_state == INITIALIZED_FOR_COMPRESSION) {
runtime.reuse_buffers = true;
if (init_writer(block_size, *buf, *buf_size) == false)
return 0;
}
init_state = INITIALIZED_FOR_COMPRESSION;
if (runtime.using_cuda) {
memcpy(input->buffer, *buf, input->length);
if (snappy_compress_cuda(input, output, block_size, &runtime) != SNAPPY_OK) {
fprintf(stderr, "Failed to compress input data on the GPU\n");
return 0;
}
// Because HDF5 manages the output buffer memory we have no option other
// than creating a copy of the compressed data; HDF5 doesn't know about
// cudaMalloc() nor cudaFree().
if (*buf_size < output->length)
{
char *newbuf = (char *) malloc(sizeof(char) * output->length);
if (! newbuf) {
fprintf(stderr, "Not enough memory to hold the compressed data\n");
return 0;
}
free(*buf);
*buf = newbuf;
*buf_size = output->length;
}
memcpy(*buf, output->buffer, output->length);
} else {
if (snappy_compress_host(input, output, block_size) != SNAPPY_OK) {
fprintf(stderr, "Failed to compress input data\n");
return 0;
}
memcpy(*buf, output->buffer, output->length);
}
}
return output->length;
}
extern "C" const H5Z_class2_t SNAPPY_CUDA_FILTER[1] = {{
H5Z_CLASS_T_VERS,
SNAPPY_CUDA_FILTER_ID,
1, 1,
"snappy_cuda_filter",
NULL, /* can_apply */
NULL, /* set_local */
filter_callback,
}};
extern "C" H5PL_type_t H5PLget_plugin_type(void) { return H5PL_TYPE_FILTER; }
extern "C" const void *H5PLget_plugin_info(void) { return SNAPPY_CUDA_FILTER; }