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351 lines
12 KiB
C
351 lines
12 KiB
C
#ident "$Id$"
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#ident "Copyright (c) 2007-2010 Tokutek Inc. All rights reserved."
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#ident "The technology is licensed by the Massachusetts Institute of Technology, Rutgers State University of New Jersey, and the Research Foundation of State University of New York at Stony Brook under United States of America Serial No. 11/760379 and to the patents and/or patent applications resulting from it."
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#include <toku_portability.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "quicklz.h"
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#include <zlib.h>
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#include "toku_assert.h"
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#include "x1764.h"
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#include "threadpool.h"
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#include "sub_block.h"
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#include "compress.h"
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#include "memory.h"
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SUB_BLOCK sub_block_creat(void) {
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SUB_BLOCK XMALLOC(sb);
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sub_block_init(sb);
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return sb;
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}
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void sub_block_init(SUB_BLOCK sub_block) {
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sub_block->uncompressed_ptr = 0;
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sub_block->uncompressed_size = 0;
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sub_block->compressed_ptr = 0;
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sub_block->compressed_size_bound = 0;
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sub_block->compressed_size = 0;
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sub_block->xsum = 0;
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}
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// get the size of the compression header
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size_t
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sub_block_header_size(int n_sub_blocks) {
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return sizeof (u_int32_t) + n_sub_blocks * sizeof (struct stored_sub_block);
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}
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void
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set_compressed_size_bound(struct sub_block *se, enum toku_compression_method method) {
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se->compressed_size_bound = toku_compress_bound(method, se->uncompressed_size);
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}
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// get the sum of the sub block compressed sizes
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size_t
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get_sum_compressed_size_bound(int n_sub_blocks, struct sub_block sub_block[], enum toku_compression_method method) {
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size_t compressed_size_bound = 0;
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for (int i = 0; i < n_sub_blocks; i++) {
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sub_block[i].compressed_size_bound = toku_compress_bound(method, sub_block[i].uncompressed_size);
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compressed_size_bound += sub_block[i].compressed_size_bound;
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}
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return compressed_size_bound;
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}
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// get the sum of the sub block uncompressed sizes
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size_t
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get_sum_uncompressed_size(int n_sub_blocks, struct sub_block sub_block[]) {
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size_t uncompressed_size = 0;
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for (int i = 0; i < n_sub_blocks; i++)
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uncompressed_size += sub_block[i].uncompressed_size;
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return uncompressed_size;
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}
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// round up n
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static inline int
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alignup32(int a, int b) {
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return ((a+b-1) / b) * b;
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}
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// Choose n_sub_blocks and sub_block_size such that the product is >= total_size and the sub_block_size is at
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// least >= the target_sub_block_size.
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int
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choose_sub_block_size(int total_size, int n_sub_blocks_limit, int *sub_block_size_ret, int *n_sub_blocks_ret) {
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if (total_size < 0 || n_sub_blocks_limit < 1)
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return EINVAL;
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const int alignment = 32;
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int n_sub_blocks, sub_block_size;
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n_sub_blocks = total_size / target_sub_block_size;
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if (n_sub_blocks <= 1) {
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if (total_size > 0 && n_sub_blocks_limit > 0)
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n_sub_blocks = 1;
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sub_block_size = total_size;
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} else {
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if (n_sub_blocks > n_sub_blocks_limit) // limit the number of sub-blocks
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n_sub_blocks = n_sub_blocks_limit;
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sub_block_size = alignup32(total_size / n_sub_blocks, alignment);
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while (sub_block_size * n_sub_blocks < total_size) // round up the sub-block size until big enough
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sub_block_size += alignment;
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}
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*sub_block_size_ret = sub_block_size;
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*n_sub_blocks_ret = n_sub_blocks;
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return 0;
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}
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// Choose the right size of basement nodes. For now, just align up to
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// 256k blocks and hope it compresses well enough.
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int
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choose_basement_node_size(int total_size, int *sub_block_size_ret, int *n_sub_blocks_ret) {
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if (total_size < 0)
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return EINVAL;
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*n_sub_blocks_ret = (total_size + max_basement_node_uncompressed_size - 1) / max_basement_node_uncompressed_size;
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*sub_block_size_ret = max_basement_node_uncompressed_size;
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return 0;
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}
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void
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set_all_sub_block_sizes(int total_size, int sub_block_size, int n_sub_blocks, struct sub_block sub_block[]) {
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int size_left = total_size;
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int i;
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for (i = 0; i < n_sub_blocks-1; i++) {
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sub_block[i].uncompressed_size = sub_block_size;
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size_left -= sub_block_size;
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}
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if (i == 0 || size_left > 0)
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sub_block[i].uncompressed_size = size_left;
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}
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// find the index of the first sub block that contains offset
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// Returns the sub block index, else returns -1
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int
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get_sub_block_index(int n_sub_blocks, struct sub_block sub_block[], size_t offset) {
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size_t start_offset = 0;
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for (int i = 0; i < n_sub_blocks; i++) {
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size_t size = sub_block[i].uncompressed_size;
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if (offset < start_offset + size)
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return i;
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start_offset += size;
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}
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return -1;
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}
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#include "workset.h"
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void
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compress_work_init(struct compress_work *w, enum toku_compression_method method, struct sub_block *sub_block) {
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w->method = method;
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w->sub_block = sub_block;
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}
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//
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// takes the uncompressed contents of sub_block
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// and compresses them into sb_compressed_ptr
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// cs_bound is the compressed size bound
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// Returns the size of the compressed data
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//
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u_int32_t
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compress_nocrc_sub_block(
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struct sub_block *sub_block,
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void* sb_compressed_ptr,
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u_int32_t cs_bound,
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enum toku_compression_method method
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)
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{
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// compress it
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Bytef *uncompressed_ptr = (Bytef *) sub_block->uncompressed_ptr;
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Bytef *compressed_ptr = (Bytef *) sb_compressed_ptr;
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uLongf uncompressed_len = sub_block->uncompressed_size;
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uLongf real_compressed_len = cs_bound;
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toku_compress(method,
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compressed_ptr, &real_compressed_len,
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uncompressed_ptr, uncompressed_len);
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return real_compressed_len;
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}
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void
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compress_sub_block(struct sub_block *sub_block, enum toku_compression_method method) {
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sub_block->compressed_size = compress_nocrc_sub_block(
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sub_block,
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sub_block->compressed_ptr,
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sub_block->compressed_size_bound,
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method
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);
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// checksum it
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sub_block->xsum = x1764_memory(sub_block->compressed_ptr, sub_block->compressed_size);
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}
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void *
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compress_worker(void *arg) {
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struct workset *ws = (struct workset *) arg;
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while (1) {
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struct compress_work *w = (struct compress_work *) workset_get(ws);
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if (w == NULL)
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break;
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compress_sub_block(w->sub_block, w->method);
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}
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workset_release_ref(ws);
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return arg;
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}
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size_t
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compress_all_sub_blocks(int n_sub_blocks, struct sub_block sub_block[], char *uncompressed_ptr, char *compressed_ptr, int num_cores, struct toku_thread_pool *pool, enum toku_compression_method method) {
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char *compressed_base_ptr = compressed_ptr;
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size_t compressed_len;
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// This is a complex way to write a parallel loop. Cilk would be better.
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if (n_sub_blocks == 1) {
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// single sub-block
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sub_block[0].uncompressed_ptr = uncompressed_ptr;
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sub_block[0].compressed_ptr = compressed_ptr;
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compress_sub_block(&sub_block[0], method);
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compressed_len = sub_block[0].compressed_size;
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} else {
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// multiple sub-blocks
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int T = num_cores; // T = min(num_cores, n_sub_blocks) - 1
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if (T > n_sub_blocks)
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T = n_sub_blocks;
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if (T > 0)
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T = T - 1; // threads in addition to the running thread
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struct workset ws;
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workset_init(&ws);
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struct compress_work work[n_sub_blocks];
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workset_lock(&ws);
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for (int i = 0; i < n_sub_blocks; i++) {
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sub_block[i].uncompressed_ptr = uncompressed_ptr;
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sub_block[i].compressed_ptr = compressed_ptr;
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compress_work_init(&work[i], method, &sub_block[i]);
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workset_put_locked(&ws, &work[i].base);
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uncompressed_ptr += sub_block[i].uncompressed_size;
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compressed_ptr += sub_block[i].compressed_size_bound;
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}
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workset_unlock(&ws);
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// compress the sub-blocks
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if (0) printf("%s:%d T=%d N=%d\n", __FUNCTION__, __LINE__, T, n_sub_blocks);
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toku_thread_pool_run(pool, 0, &T, compress_worker, &ws);
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workset_add_ref(&ws, T);
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compress_worker(&ws);
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// wait for all of the work to complete
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workset_join(&ws);
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workset_destroy(&ws);
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// squeeze out the holes not used by the compress bound
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compressed_ptr = compressed_base_ptr + sub_block[0].compressed_size;
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for (int i = 1; i < n_sub_blocks; i++) {
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memmove(compressed_ptr, sub_block[i].compressed_ptr, sub_block[i].compressed_size);
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compressed_ptr += sub_block[i].compressed_size;
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}
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compressed_len = compressed_ptr - compressed_base_ptr;
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}
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return compressed_len;
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}
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// initialize the decompression work
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void
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decompress_work_init(struct decompress_work *dw,
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void *compress_ptr, u_int32_t compress_size,
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void *uncompress_ptr, u_int32_t uncompress_size,
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u_int32_t xsum) {
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dw->compress_ptr = compress_ptr;
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dw->compress_size = compress_size;
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dw->uncompress_ptr = uncompress_ptr;
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dw->uncompress_size = uncompress_size;
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dw->xsum = xsum;
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dw->error = 0;
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}
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int verbose_decompress_sub_block = 1;
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// decompress one block
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int
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decompress_sub_block(void *compress_ptr, u_int32_t compress_size, void *uncompress_ptr, u_int32_t uncompress_size, u_int32_t expected_xsum) {
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int result = 0;
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// verify checksum
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u_int32_t xsum = x1764_memory(compress_ptr, compress_size);
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if (xsum != expected_xsum) {
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if (verbose_decompress_sub_block) fprintf(stderr, "%s:%d xsum %u expected %u\n", __FUNCTION__, __LINE__, xsum, expected_xsum);
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result = EINVAL;
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} else {
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// decompress
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toku_decompress(uncompress_ptr, uncompress_size, compress_ptr, compress_size);
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}
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return result;
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}
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// decompress blocks until there is no more work to do
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void *
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decompress_worker(void *arg) {
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struct workset *ws = (struct workset *) arg;
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while (1) {
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struct decompress_work *dw = (struct decompress_work *) workset_get(ws);
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if (dw == NULL)
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break;
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dw->error = decompress_sub_block(dw->compress_ptr, dw->compress_size, dw->uncompress_ptr, dw->uncompress_size, dw->xsum);
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}
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workset_release_ref(ws);
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return arg;
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}
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int
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decompress_all_sub_blocks(int n_sub_blocks, struct sub_block sub_block[], unsigned char *compressed_data, unsigned char *uncompressed_data, int num_cores, struct toku_thread_pool *pool) {
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int r;
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if (n_sub_blocks == 1) {
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r = decompress_sub_block(compressed_data, sub_block[0].compressed_size, uncompressed_data, sub_block[0].uncompressed_size, sub_block[0].xsum);
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} else {
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// compute the number of additional threads needed for decompressing this node
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int T = num_cores; // T = min(#cores, #blocks) - 1
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if (T > n_sub_blocks)
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T = n_sub_blocks;
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if (T > 0)
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T = T - 1; // threads in addition to the running thread
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// init the decompression work set
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struct workset ws;
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workset_init(&ws);
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// initialize the decompression work and add to the work set
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struct decompress_work decompress_work[n_sub_blocks];
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workset_lock(&ws);
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for (int i = 0; i < n_sub_blocks; i++) {
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decompress_work_init(&decompress_work[i], compressed_data, sub_block[i].compressed_size, uncompressed_data, sub_block[i].uncompressed_size, sub_block[i].xsum);
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workset_put_locked(&ws, &decompress_work[i].base);
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uncompressed_data += sub_block[i].uncompressed_size;
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compressed_data += sub_block[i].compressed_size;
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}
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workset_unlock(&ws);
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// decompress the sub-blocks
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if (0) printf("%s:%d Cores=%d Blocks=%d T=%d\n", __FUNCTION__, __LINE__, num_cores, n_sub_blocks, T);
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toku_thread_pool_run(pool, 0, &T, decompress_worker, &ws);
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workset_add_ref(&ws, T);
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decompress_worker(&ws);
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// cleanup
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workset_join(&ws);
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workset_destroy(&ws);
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r = 0;
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for (int i = 0; i < n_sub_blocks; i++) {
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r = decompress_work[i].error;
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if (r != 0)
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break;
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}
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}
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return r;
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}
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