diff --git a/main.c b/main.c
index ab15c1e..7d4ad11 100644
--- a/main.c
+++ b/main.c
@@ -1076,7 +1076,8 @@ start_decompress(const char *filename, const char *to_filename)
 		}
 		if (enable_rabin_scan || enable_fixed_scan) {
 			tdat->rctx = create_dedupe_context(chunksize, compressed_chunksize, rab_blk_size,
-			    algo, &props, enable_delta_encode, enable_fixed_scan, version, DECOMPRESS);
+			    algo, &props, enable_delta_encode, enable_fixed_scan, version, DECOMPRESS, 0,
+			    NULL);
 			if (tdat->rctx == NULL) {
 				UNCOMP_BAIL;
 			}
@@ -1580,7 +1581,7 @@ static int
 start_compress(const char *filename, uint64_t chunksize, int level)
 {
 	struct wdata w;
-	char tmpfile1[MAXPATHLEN];
+	char tmpfile1[MAXPATHLEN], tmpdir[MAXPATHLEN];
 	char to_filename[MAXPATHLEN];
 	uint64_t compressed_chunksize, n_chunksize;
 	int64_t rbytes, rabin_count;
@@ -1588,7 +1589,7 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 	struct stat sbuf;
 	int compfd = -1, uncompfd = -1, err;
 	int thread, bail, single_chunk;
-	uint32_t i, nprocs, np, p;
+	uint32_t i, nprocs, np, p, dedupe_flag;
 	struct cmp_data **dary = NULL, *tdat;
 	pthread_t writer_thr;
 	uchar_t *cread_buf, *pos;
@@ -1621,13 +1622,21 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 	}
 
 	flags = 0;
+	dedupe_flag = RABIN_DEDUPE_SEGMENTED; // Silence the compiler
 	if (enable_rabin_scan || enable_fixed_scan || enable_rabin_global) {
-		if (enable_rabin_global)
+		if (enable_rabin_global) {
 			flags |= (FLAG_DEDUP | FLAG_DEDUP_FIXED);
-		else if (enable_rabin_scan)
+			dedupe_flag = RABIN_DEDUPE_FILE_GLOBAL;
+			if (pipe_mode) {
+				sbuf.st_size = SIXTEEN_GB;
+			}
+		} else if (enable_rabin_scan) {
 			flags |= FLAG_DEDUP;
-		else
+			dedupe_flag = RABIN_DEDUPE_SEGMENTED;
+		} else {
 			flags |= FLAG_DEDUP_FIXED;
+			dedupe_flag = RABIN_DEDUPE_FIXED;
+		}
 		/* Additional scratch space for dedup arrays. */
 		if (chunksize + dedupe_buf_extra(chunksize, 0, algo, enable_delta_encode)
 		    > compressed_chunksize) {
@@ -1747,6 +1756,7 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 		 */
 		strcpy(tmpfile1, filename);
 		strcpy(tmpfile1, dirname(tmpfile1));
+		strcpy(tmpdir, tmpfile1);
 		strcat(tmpfile1, "/.pcompXXXXXX");
 		snprintf(to_filename, sizeof (to_filename), "%s" COMP_EXTN, filename);
 		if ((compfd = mkstemp(tmpfile1)) == -1) {
@@ -1757,6 +1767,9 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 		signal(SIGINT, Int_Handler);
 		signal(SIGTERM, Int_Handler);
 	} else {
+		char *tmp;
+		struct stat st;
+
 		/*
 		 * Use stdin/stdout for pipe mode.
 		 */
@@ -1770,6 +1783,34 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 			perror("fileno ");
 			COMP_BAIL;
 		}
+
+		/*
+		 * Get a workable temporary dir. Required if global dedupe is enabled.
+		 */
+		tmp = getenv("TMPDIR");
+		if (tmp == NULL) {
+			tmp = getenv("HOME");
+			if (tmp == NULL) {
+				if (getcwd(tmpdir, MAXPATHLEN) == NULL) {
+					tmp = "/tmp";
+				} else {
+					tmp = tmpdir;
+				}
+			}
+		}
+		if (stat(tmp, &st) == -1) {
+			fprintf(stderr, "Unable to find writable temporary dir.\n");
+			COMP_BAIL;
+		}
+		if (!S_ISDIR(st.st_mode)) {
+			if (strcmp(tmp, "/tmp") != 0) {
+			tmp = "/tmp";
+			} else {
+				fprintf(stderr, "Unable to find writable temporary dir.\n");
+				COMP_BAIL;
+			}
+		}
+		strcpy(tmpdir, tmp);
 	}
 
 	if (encrypt_type)
@@ -1819,13 +1860,15 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 		// i is unsigned so this wraps around backwards for i == 0
 		tdat->index_sem_other = &(dary[(i - 1) % nprocs]->index_sem);
 		if (_init_func) {
-			if (_init_func(&(tdat->data), &(tdat->level), props.nthreads, chunksize, VERSION, COMPRESS) != 0) {
+			if (_init_func(&(tdat->data), &(tdat->level), props.nthreads, chunksize,
+			    VERSION, COMPRESS) != 0) {
 				COMP_BAIL;
 			}
 		}
 		if (enable_rabin_scan || enable_fixed_scan) {
 			tdat->rctx = create_dedupe_context(chunksize, compressed_chunksize, rab_blk_size,
-			    algo, &props, enable_delta_encode, enable_fixed_scan, VERSION, COMPRESS);
+			    algo, &props, enable_delta_encode, dedupe_flag, VERSION, COMPRESS, sbuf.st_size,
+			    tmpdir);
 			if (tdat->rctx == NULL) {
 				COMP_BAIL;
 			}
@@ -1959,7 +2002,7 @@ start_compress(const char *filename, uint64_t chunksize, int level)
 	 */
 	if (enable_rabin_split) {
 		rctx = create_dedupe_context(chunksize, 0, 0, algo, &props, enable_delta_encode,
-		    enable_fixed_scan, VERSION, COMPRESS);
+		    enable_fixed_scan, VERSION, COMPRESS, 0, NULL);
 		rbytes = Read_Adjusted(uncompfd, cread_buf, chunksize, &rabin_count, rctx);
 	} else {
 		rbytes = Read(uncompfd, cread_buf, chunksize);
diff --git a/rabin/global/db.c b/rabin/global/db.c
index 6bdaedf..fcb639e 100644
--- a/rabin/global/db.c
+++ b/rabin/global/db.c
@@ -41,13 +41,6 @@
 /*
  * Hashtable structures for in-memory index.
  */
-typedef struct _hash_entry {
-	uint64_t item_offset;
-	uint32_t item_size;
-	struct _hash_entry *next;
-	uchar_t cksum[1];
-} hash_entry_t;
-
 typedef struct {
 	hash_entry_t **tab;
 } htab_t;
@@ -97,7 +90,7 @@ static cleanup_indx(index_t *indx)
 
 archive_config_t *
 init_global_db_s(char *path, char *tmppath, uint32_t chunksize, uint64_t user_chunk_sz,
-		 int pct_interval, compress_algo_t algo, cksum_t ck, cksum_t ck_sim,
+		 int pct_interval, const char *algo, cksum_t ck, cksum_t ck_sim,
 		 size_t file_sz, size_t memlimit, int nthreads)
 {
 	archive_config_t *cfg;
@@ -107,6 +100,10 @@ init_global_db_s(char *path, char *tmppath, uint32_t chunksize, uint64_t user_ch
 	cfg = calloc(1, sizeof (archive_config_t));
 	rv = set_config_s(cfg, algo, ck, ck_sim, chunksize, file_sz, user_chunk_sz, pct_interval);
 
+	if (cfg->dedupe_mode == MODE_SIMPLE) {
+		pct_interval = 0;
+	}
+
 	if (path != NULL) {
 		printf("Disk based index not yet implemented.\n");
 		free(cfg);
@@ -118,12 +115,14 @@ init_global_db_s(char *path, char *tmppath, uint32_t chunksize, uint64_t user_ch
 		index_t *indx;
 
 		// Compute total hashtable entries first
-		if (pct_interval == 0)
+		if (pct_interval == 0) {
 			intervals = 1;
-		else
+			hash_slots = file_sz / cfg->chunk_sz_bytes + 1;
+		} else {
 			intervals = 100 / pct_interval - 1;
-		hash_slots = file_sz / cfg->segment_sz_bytes + 1;
-		hash_slots *= intervals;
+			hash_slots = file_sz / cfg->segment_sz_bytes + 1;
+			hash_slots *= intervals;
+		}
 		hash_entry_size = sizeof (hash_entry_t) + cfg->similarity_cksum_sz - 1;
 
 		// Compute memory required to hold all hash entries assuming worst case 50%
@@ -214,7 +213,7 @@ mycmp(uchar_t *a, uchar_t *b, int sz)
 /*
  * Lookup and insert item if indicated. Not thread-safe by design.
  */
-uint64_t
+hash_entry_t *
 db_lookup_insert_s(archive_config_t *cfg, uchar_t *sim_cksum, int interval,
 		   uint64_t item_offset, uint32_t item_size, int do_insert)
 {
@@ -234,7 +233,7 @@ db_lookup_insert_s(archive_config_t *cfg, uchar_t *sim_cksum, int interval,
 		while (ent) {
 			if (mycmp(sim_cksum, ent->cksum, cfg->similarity_cksum_sz) == 0 &&
 			    ent->item_size == item_size) {
-				return (ent->item_offset);
+				return (ent);
 			}
 			pent = &(ent->next);
 			ent = ent->next;
@@ -242,7 +241,7 @@ db_lookup_insert_s(archive_config_t *cfg, uchar_t *sim_cksum, int interval,
 	} else {
 		while (ent) {
 			if (mycmp(sim_cksum, ent->cksum, cfg->similarity_cksum_sz) == 0) {
-				return (ent->item_offset);
+				return (ent);
 			}
 			pent = &(ent->next);
 			ent = ent->next;
@@ -263,5 +262,5 @@ db_lookup_insert_s(archive_config_t *cfg, uchar_t *sim_cksum, int interval,
 		memcpy(ent->cksum, sim_cksum, cfg->similarity_cksum_sz);
 		*pent = ent;
 	}
-	return (0);
+	return (NULL);
 }
diff --git a/rabin/global/db.h b/rabin/global/db.h
index d8b68a1..228b953 100644
--- a/rabin/global/db.h
+++ b/rabin/global/db.h
@@ -31,12 +31,22 @@
 extern "C" {
 #endif
 
+/*
+ * Publically visible In-memory hashtable entry.
+ */
+typedef struct _hash_entry {
+	uint64_t item_offset;
+	uint32_t item_size;
+	struct _hash_entry *next;
+	uchar_t cksum[1];
+} hash_entry_t;
+
 archive_config_t *init_global_db(char *configfile);
 archive_config_t *init_global_db_s(char *path, char *tmppath, uint32_t chunksize,
-			uint64_t user_chunk_sz, int pct_interval, compress_algo_t algo,
+			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);
-uint64_t db_lookup_insert_s(archive_config_t *cfg, uchar_t *sim_cksum, int interval,
+hash_entry_t *db_lookup_insert_s(archive_config_t *cfg, uchar_t *sim_cksum, int interval,
 		   uint64_t item_offset, uint32_t item_size, int do_insert);
 
 #ifdef	__cplusplus
diff --git a/rabin/global/dedupe_config.c b/rabin/global/dedupe_config.c
index 5e86c92..4efecc5 100644
--- a/rabin/global/dedupe_config.c
+++ b/rabin/global/dedupe_config.c
@@ -38,12 +38,6 @@
 #include "dedupe_config.h"
 #include "db.h"
 
-#define	ONE_PB (1125899906842624ULL)
-#define	ONE_TB (1099511627776ULL)
-#define	FOUR_MB (4194304ULL)
-#define	EIGHT_MB (8388608ULL)
-#define	EIGHT_GB (8589934592ULL)
-
 static compress_algo_t
 get_compress_level(compress_algo_t algo)
 {
@@ -64,7 +58,7 @@ get_compress_level(compress_algo_t algo)
 }
 
 static int
-get_compress_algo(char *algo_name)
+get_compress_algo(const char *algo_name)
 {
 	if (strcmp(algo_name, "none") == 0) {
 		return (COMPRESS_NONE);
@@ -350,11 +344,11 @@ write_config(char *configfile, archive_config_t *cfg)
 }
 
 int
-set_config_s(archive_config_t *cfg, compress_algo_t algo, cksum_t ck, cksum_t ck_sim,
+set_config_s(archive_config_t *cfg, const char *algo, cksum_t ck, cksum_t ck_sim,
 	     uint32_t chunksize, size_t file_sz, uint64_t user_chunk_sz, int pct_interval)
 {
 
-	cfg->algo = algo;
+	cfg->algo = get_compress_algo(algo);
 	cfg->chunk_cksum_type = ck;
 	cfg->similarity_cksum = ck_sim;
 	cfg->compress_level = get_compress_level(cfg->algo);
@@ -366,7 +360,7 @@ set_config_s(archive_config_t *cfg, compress_algo_t algo, cksum_t ck, cksum_t ck
 	cfg->archive_sz = file_sz;
 	cfg->dedupe_mode = MODE_SIMILARITY;
 
-	if (cfg->archive_sz <= EIGHT_GB) {
+	if (cfg->archive_sz <= SIXTEEN_GB) {
 		cfg->dedupe_mode = MODE_SIMPLE;
 		cfg->segment_sz_bytes = user_chunk_sz;
 
diff --git a/rabin/global/dedupe_config.h b/rabin/global/dedupe_config.h
index 0c9da58..14529b7 100644
--- a/rabin/global/dedupe_config.h
+++ b/rabin/global/dedupe_config.h
@@ -86,7 +86,7 @@ typedef struct _segment_entry {
 
 int read_config(char *configfile, archive_config_t *cfg);
 int write_config(char *configfile, archive_config_t *cfg);
-int set_config_s(archive_config_t *cfg, compress_algo_t algo, cksum_t ck, cksum_t ck_sim,
+int set_config_s(archive_config_t *cfg, const char *algo, cksum_t ck, cksum_t ck_sim,
 		uint32_t chunksize, size_t file_sz, uint64_t user_chunk_sz,
 		int pct_interval);
 
diff --git a/rabin/rabin_dedup.c b/rabin/rabin_dedup.c
index d0ac8b5..105186a 100755
--- a/rabin/rabin_dedup.c
+++ b/rabin/rabin_dedup.c
@@ -104,6 +104,7 @@ extern int bspatch(u_char *pbuf, u_char *oldbuf, bsize_t oldsize, u_char *newbuf
 static pthread_mutex_t init_lock = PTHREAD_MUTEX_INITIALIZER;
 uint64_t ir[256], out[256];
 static int inited = 0;
+archive_config_t *arc = NULL;
 
 static uint32_t
 dedupe_min_blksz(int rab_blk_sz)
@@ -129,9 +130,10 @@ dedupe_buf_extra(uint64_t chunksize, int rab_blk_sz, const char *algo, int delta
 dedupe_context_t *
 create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_sz,
     const char *algo, const algo_props_t *props, int delta_flag, int dedupe_flag,
-    int file_version, compress_op_t op) {
+    int file_version, compress_op_t op, uint64_t file_size, char *tmppath) {
 	dedupe_context_t *ctx;
 	uint32_t i;
+	archive_config_t *arc;
 
 	if (rab_blk_sz < 1 || rab_blk_sz > 5)
 		rab_blk_sz = RAB_BLK_DEFAULT;
@@ -140,6 +142,7 @@ create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_s
 		delta_flag = 0;
 		inited = 1;
 	}
+	arc = NULL;
 
 	/*
 	 * Pre-compute a table of irreducible polynomial evaluations for each
@@ -169,6 +172,19 @@ create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_s
 			}
 			ir[j] = val;
 		}
+
+		if (dedupe_flag == RABIN_DEDUPE_FILE_GLOBAL && op == COMPRESS && rab_blk_sz > 0) {
+			my_sysinfo msys_info;
+
+			get_sysinfo(&msys_info);
+			arc = init_global_db_s(NULL, NULL, rab_blk_sz, chunksize, DEFAULT_PCT_INTERVAL,
+					      algo, props->cksum, props->cksum, file_size,
+					      msys_info.freeram, props->nthreads);
+			if (arc == NULL) {
+				pthread_mutex_unlock(&init_lock);
+				return (NULL);
+			}
+		}
 		inited = 1;
 	}
 	pthread_mutex_unlock(&init_lock);
@@ -194,6 +210,7 @@ create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, int rab_blk_s
 	 */
 	ctx = (dedupe_context_t *)slab_alloc(NULL, sizeof (dedupe_context_t));
 	ctx->rabin_poly_max_block_size = RAB_POLYNOMIAL_MAX_BLOCK_SIZE;
+	ctx->arc = arc;
 
 	ctx->current_window_data = NULL;
 	ctx->dedupe_flag = dedupe_flag;
diff --git a/rabin/rabin_dedup.h b/rabin/rabin_dedup.h
index b2c4e9f..4a497ef 100644
--- a/rabin/rabin_dedup.h
+++ b/rabin/rabin_dedup.h
@@ -64,6 +64,7 @@
 #define _RABIN_POLY_H_
 
 #include "utils.h"
+#include <db.h>
 
 //List of constants, mostly constraints and defaults for various parameters
 //to the Rabin Fingerprinting algorithm
@@ -121,6 +122,7 @@
 #define	RABIN_DEDUPE_SEGMENTED	0
 #define	RABIN_DEDUPE_FIXED	1
 #define	RABIN_DEDUPE_FILE_GLOBAL	2
+#define	DEFAULT_PCT_INTERVAL	2
 
 // Mask to extract value from a rabin index entry
 #define	RABIN_INDEX_VALUE (0x3FFFFFFFUL)
@@ -176,11 +178,12 @@ typedef struct {
 	short valid;
 	void *lzma_data;
 	int level, delta_flag, dedupe_flag, deltac_min_distance;
+	archive_config_t *arc;
 } dedupe_context_t;
 
 extern dedupe_context_t *create_dedupe_context(uint64_t chunksize, uint64_t real_chunksize, 
 	int rab_blk_sz, const char *algo, const algo_props_t *props, int delta_flag, int fixed_flag,
-	int file_version, compress_op_t op);
+	int file_version, compress_op_t op, uint64_t file_size, char *tmppath);
 extern void destroy_dedupe_context(dedupe_context_t *ctx);
 extern unsigned int dedupe_compress(dedupe_context_t *ctx, unsigned char *buf, 
 	uint64_t *size, uint64_t offset, uint64_t *rabin_pos, int mt);
diff --git a/utils/utils.c b/utils/utils.c
index 457728e..5060ccc 100644
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -374,8 +374,13 @@ void
 get_sysinfo(my_sysinfo *msys_info)
 {
 	struct sysinfo sys_info;
-	sysinfo(&sys_info);
+	int rv;
 
+	rv = sysinfo(&sys_info);
+
+	if (rv == -1) {
+		sys_info.freeram = 100 * 1024 * 1024; // 100M arbitrary
+	}
 	msys_info->totalram = sys_info.totalram;
 	msys_info->freeram = sys_info.freeram;
 	msys_info->totalswap = sys_info.totalswap;
diff --git a/utils/utils.h b/utils/utils.h
index 2485609..c2ec2a4 100644
--- a/utils/utils.h
+++ b/utils/utils.h
@@ -48,6 +48,13 @@ extern "C" {
 #define	EIGHTM		(8UL * 1024UL * 1024UL)
 #define	FOURM		(4UL * 1024UL * 1024UL)
 
+#define	ONE_PB (1125899906842624ULL)
+#define	ONE_TB (1099511627776ULL)
+#define	FOUR_MB FOURM
+#define	EIGHT_MB EIGHTM
+#define	EIGHT_GB (8589934592ULL)
+#define	SIXTEEN_GB (EIGHT_GB * 2)
+
 #if !defined(sun) && !defined(__sun)
 #define uchar_t u_char
 #endif