Work in progress changes for Segmented Global Deduplication.

Makefile.in

@@ -84,8 +84,8 @@ BZLIB_HDRS = $(MAINHDRS)
 BZLIB_OBJS = $(BZLIB_SRCS:.c=.o)
 BZLIB_CPPFLAGS = @LIBBZ2_INC@
 
-RABINSRCS = rabin/rabin_dedup.c rabin/global/db.c rabin/global/dedupe_config.c
+RABINSRCS = rabin/rabin_dedup.c rabin/global/index.c rabin/global/dedupe_config.c
-RABINHDRS = rabin/rabin_dedup.h utils/utils.h rabin/global/db.h rabin/global/dedupe_config.h
+RABINHDRS = rabin/rabin_dedup.h utils/utils.h rabin/global/index.h rabin/global/dedupe_config.h
 RABINOBJS = $(RABINSRCS:.c=.o)
 
 BSDIFFSRCS = bsdiff/bsdiff.c bsdiff/bspatch.c bsdiff/rle_encoder.c

main.c

@@ -1908,6 +1908,14 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 	nprocs = nthreads;
 	fprintf(stderr, "\n");
 
+	if (enable_rabin_global && !pipe_mode) {
+		my_sysinfo msys_info;
+
+		get_sys_limits(&msys_info);
+		global_dedupe_bufadjust(rab_blk_size, &chunksize, 0, algo, cksum,
+				CKSUM_BLAKE256, sbuf.st_size, msys_info.freeram, nthreads);
+	}
+
 	dary = (struct cmp_data **)slab_calloc(NULL, nprocs, sizeof (struct cmp_data *));
 	if ((enable_rabin_scan || enable_fixed_scan))
 		cread_buf = (uchar_t *)slab_alloc(NULL, compressed_chunksize);

rabin/global/dedupe_config.c

@@ -36,7 +36,7 @@
 #include <rabin_dedup.h>
 
 #include "dedupe_config.h"
-#include "db.h"
+#include "index.h"
 
 static compress_algo_t
 get_compress_level(compress_algo_t algo)

rabin/global/index.c

@@ -36,7 +36,7 @@
 #include <pthread.h>
 #include <xxhash.h>
 
-#include "db.h"
+#include "index.h"
 
 /*
  * Hashtable structures for in-memory index.
@@ -117,9 +117,12 @@ setup_db_config_s(archive_config_t *cfg, uint32_t chunksize, uint64_t *user_chun
 	 * If file_sz = 0 and pct_interval != 0 then we are in pipe mode and want a segmented
 	 * index. This is typically for WAN deduplication of large data transfers.
 	 */
+	if (pct_interval != 0)
+		set_user = 0;
+	else
+		set_user = 1;
 	if (file_sz == 0 && *pct_interval == 0)
 		*pct_interval = 100;
-	set_user = 0;
 
 set_cfg:
 	rv = set_config_s(cfg, algo, ck, ck_sim, chunksize, file_sz, *user_chunk_sz, *pct_interval);
@@ -131,11 +134,11 @@ set_cfg:
 	}
 
 	/*
-	 * Adjust user_chunk_sz if this is the second try.
+	 * Adjust user_chunk_sz if indicated.
 	 */
 	if (set_user) {
 		if (*user_chunk_sz < cfg->segment_sz_bytes) {
-			*user_chunk_sz = cfg->segment_sz_bytes;
+			*user_chunk_sz = cfg->segment_sz_bytes + (cfg->segment_sz_bytes >> 1);
 		} else {
 			*user_chunk_sz = (*user_chunk_sz / cfg->segment_sz_bytes) * cfg->segment_sz_bytes;
 		}

rabin/global/index.h

@@ -22,8 +22,8 @@
  * moinakg@belenix.org, http://moinakg.wordpress.com/
  */
 
-#ifndef	_DB_H
+#ifndef	_INDEX_H
-#define	_DB_H
+#define	_INDEX_H
 
 #include <dedupe_config.h>
 

rabin/rabin_dedup.c

@@ -131,7 +131,7 @@ dedupe_buf_extra(uint64_t chunksize, int rab_blk_sz, const char *algo, int delta
  * to align with deduplication requirements.
  */
 int
-global_dedupe_chkmem(uint32_t chunksize, uint64_t *user_chunk_sz, int pct_interval,
+global_dedupe_bufadjust(uint32_t chunksize, uint64_t *user_chunk_sz, int pct_interval,
 		 const char *algo, cksum_t ck, cksum_t ck_sim, size_t file_sz,
 		 size_t memlimit, int nthreads)
 {
@@ -202,30 +202,12 @@ create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_s
 		 */
 		if (dedupe_flag == RABIN_DEDUPE_FILE_GLOBAL && op == COMPRESS && rab_blk_sz > 0) {
 			my_sysinfo msys_info;
-			char *val;
 
 			/*
-			 * Get available free memory.
+			 * Get amount of memory to use. The freeram got here is adjusted amount.
 			 */
-			get_sysinfo(&msys_info);
+			get_sys_limits(&msys_info);
 
-			if ((val = getenv("PCOMPRESS_INDEX_MEM")) != NULL) {
-				uint64_t mem;
-
-				/*
-				 * Externally specified index limit in MB.
-				 */
-				mem = strtoull(val, NULL, 0);
-				mem *= (1024 * 1024);
-				if (mem > (1024 * 1024) && mem < msys_info.freeram) {
-					msys_info.freeram = mem;
-				}
-			}
-
-			/*
-			 * Use a maximum of approx 75% of free RAM for the index.
-			 */
-			msys_info.freeram = (msys_info.freeram >> 1) + (msys_info.freeram >> 2);
 			arc = init_global_db_s(NULL, NULL, rab_blk_sz, chunksize, 0,
 					      algo, props->cksum, props->cksum, file_size,
 					      msys_info.freeram, props->nthreads);
@@ -270,6 +252,7 @@ create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_s
 	ctx->delta_flag = 0;
 	ctx->deltac_min_distance = props->deltac_min_distance;
 	ctx->pagesize = sysconf(_SC_PAGE_SIZE);
+	ctx->similarity_cksums = NULL;
 
 	/*
 	 * Scale down similarity percentage based on avg block size unless user specified
@@ -318,6 +301,17 @@ create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_s
 		return (NULL);
 	}
 
+	if (arc && dedupe_flag == RABIN_DEDUPE_FILE_GLOBAL) {
+		ctx->similarity_cksums = (uchar_t *)slab_calloc(NULL, 90 / arc->pct_interval, 32);
+		if (!ctx->similarity_cksums) {
+			fprintf(stderr,
+			    "Could not allocate dedupe context, out of memory\n");
+			destroy_dedupe_context(ctx);
+			return (NULL);
+		}
+		ctx->similarity_count = 90 / arc->pct_interval;
+	}
+
 	ctx->lzma_data = NULL;
 	ctx->level = 14;
 	if (real_chunksize > 0) {
@@ -371,6 +365,7 @@ destroy_dedupe_context(dedupe_context_t *ctx)
 			}
 			slab_free(NULL, ctx->blocks);
 		}
+		if (ctx->similarity_cksums) slab_free(NULL, ctx->similarity_cksums);
 		if (ctx->lzma_data) lzma_deinit(&(ctx->lzma_data));
 		slab_free(NULL, ctx);
 	}
@@ -670,8 +665,8 @@ process_blocks:
 		 * If global dedupe is enabled then process it here.
 		 */
 		if (ctx->arc) {
-			if (ctx->arc->dedupe_mode == MODE_SIMPLE) {
 			uchar_t *g_dedupe_idx, *tgt, *src;
+
 			/*
 			 * First compute all the rabin chunk/block cryptographic hashes.
 			 */
@@ -691,15 +686,18 @@ process_blocks:
 			dedupe_index_sz = 0;
 
 			/*
-				 * First entry in table in the original file offset where this
+			 * First entry in table is the original file offset where this
 			 * data segment begins.
 			 */
 			*((uint64_t *)g_dedupe_idx) = LE64(ctx->file_offset);
 			g_dedupe_idx += (RABIN_ENTRY_SIZE * 2);
 			dedupe_index_sz += 2;
-				length = 0;
 			matchlen = 0;
 
+			if (ctx->arc->dedupe_mode == MODE_SIMPLE) {
+				/*
+				 * This code block implements Global Dedupe with simple in-memory index.
+				 */
 				/*
 				 * Now lookup blocks in index. First wait for our semaphore to be
 				 * signaled. If the previous thread in sequence is using the index
@@ -707,6 +705,7 @@ process_blocks:
 				 * predictable serialization of index access in a sequence of
 				 * threads without locking.
 				 */
+				length = 0;
 				sem_wait(ctx->index_sem);
 				for (i=0; i<blknum; i++) {
 					hash_entry_t *he;
@@ -774,6 +773,45 @@ process_blocks:
 				src = buf1;
 				g_dedupe_idx += (RABIN_ENTRY_SIZE * 2);
 
+			} else {
+				uchar_t *seg_heap, *sim_ck;
+				archive_config_t *cfg;
+				uint32_t increment, len;
+
+				/*
+				 * This code block implements Segmented similarity based Dedupe with
+				 * in-memory index.
+				 */
+				cfg = ctx->arc;
+				seg_heap = (uchar_t *)ctx->g_blocks - cfg->segment_sz_bytes;
+				for (i=0; i<blknum; i += cfg->segment_sz) {
+					length = 0;
+
+					/*
+					 * Compute length of current segment.
+					 */
+					for (j=i; j<blknum && j<cfg->segment_sz; j++)
+						length += ctx->g_blocks[i].length;
+
+					/*
+					 * Compute the cumulative similarity minhashes.
+					 */
+					sim_ck = ctx->similarity_cksums;
+					increment = length / ctx->similarity_count;
+					len = increment;
+					src = buf1 + ctx->g_blocks[i].offset;
+					tgt = seg_heap;
+					memcpy(tgt, src, length);
+					for (j=0; j<ctx->similarity_count; j++) {
+						reset_heap(&heap, len/8);
+						ksmallest((int64_t *)seg_heap, length, &heap);
+						compute_checksum(sim_ck, CKSUM_BLAKE256, seg_heap, len, 0, 0);
+						len += increment;
+						sim_ck += 32;
+					}
+				}
+			}
+
 			/*
 			 * Deduplication reduction should at least be greater than block list metadata.
 			 */
@@ -808,13 +846,6 @@ process_blocks:
 			}
 			pos1 = tgt - ctx->cbuf;
 			blknum |= GLOBAL_FLAG;
-
-			} else {
-				/*
-				 * Segmented similarity based Dedupe.
-				 */
-				
-			}
 			goto dedupe_done;
 		}
 

rabin/rabin_dedup.h

@@ -64,7 +64,7 @@
 #define _RABIN_POLY_H_
 
 #include "utils.h"
-#include <db.h>
+#include <index.h>
 #include <crypto_utils.h>
 #include <pthread.h>
 #include <semaphore.h>
@@ -188,6 +188,8 @@ typedef struct {
 	archive_config_t *arc;
 	sem_t *index_sem;
 	sem_t *index_sem_next;
+	uchar_t *similarity_cksums;
+	int similarity_count;
 	uint32_t pagesize;
 	int out_fd;
 	int id;
@@ -208,7 +210,7 @@ extern void update_dedupe_hdr(uchar_t *buf, uint64_t dedupe_index_sz_cmp,
 extern void reset_dedupe_context(dedupe_context_t *ctx);
 extern uint32_t dedupe_buf_extra(uint64_t chunksize, int rab_blk_sz, const char *algo,
 	int delta_flag);
-extern int global_dedupe_chkmem(uint32_t chunksize, uint64_t *user_chunk_sz, int pct_interval,
+extern int global_dedupe_bufadjust(uint32_t chunksize, uint64_t *user_chunk_sz, int pct_interval,
 		 const char *algo, cksum_t ck, cksum_t ck_sim, size_t file_sz,
 		 size_t memlimit, int nthreads);
 

utils/utils.c

@@ -371,10 +371,11 @@ get_mb_s(uint64_t bytes, double strt, double en)
 }
 
 void
-get_sysinfo(my_sysinfo *msys_info)
+get_sys_limits(my_sysinfo *msys_info)
 {
 	struct sysinfo sys_info;
 	int rv;
+	char *val;
 
 	rv = sysinfo(&sys_info);
 
@@ -386,4 +387,22 @@ get_sysinfo(my_sysinfo *msys_info)
 	msys_info->totalswap = sys_info.totalswap;
 	msys_info->freeswap = sys_info.freeswap;
 	msys_info->mem_unit = sys_info.mem_unit;
+
+	if ((val = getenv("PCOMPRESS_INDEX_MEM")) != NULL) {
+		uint64_t mem;
+
+		/*
+		 * Externally specified index limit in MB.
+		 */
+		mem = strtoull(val, NULL, 0);
+		mem *= (1024 * 1024);
+		if (mem > (1024 * 1024) && mem < msys_info->freeram) {
+			msys_info->freeram = mem;
+		}
+	}
+
+	/*
+	 * Use a maximum of approx 75% of free RAM for the index.
+	 */
+	msys_info->freeram = (msys_info->freeram >> 1) + (msys_info->freeram >> 2);
 }

utils/utils.h

@@ -217,7 +217,7 @@ extern void set_threadcounts(algo_props_t *props, int *nthreads, int nprocs,
 extern uint64_t get_total_ram();
 extern double get_wtime_millis(void);
 extern double get_mb_s(uint64_t bytes, double strt, double en);
-extern void get_sysinfo(my_sysinfo *msys_info);
+extern void get_sys_limits(my_sysinfo *msys_info);
 extern void init_algo_props(algo_props_t *props);
 extern void init_pcompress();