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Improve Dedupe performance.

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Add more debug timing stats.
Change default checksum to Keccak 256 (SIMD version 4x faster than Skein).
Fix compiler warning in allocator code.
This commit is contained in:
Moinak Ghosh 2012-12-29 23:43:41 +05:30
parent 36d95276ee
commit 28224d29d3
4 changed files with 20 additions and 9 deletions
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5
allocator.c
View file

@ -522,6 +522,9 @@ slab_free(void *p, void *address)
}
int
slab_cache_add(uint64_t size) {}
slab_cache_add(uint64_t size)
{
return (0);
}
#endif

5
crypto/crypto_utils.c
View file

@ -76,6 +76,9 @@ extern uint64_t lzma_crc64_8bchk(const uint8_t *buf, uint64_t size,
int
compute_checksum(uchar_t *cksum_buf, int cksum, uchar_t *buf, int64_t bytes)
{
DEBUG_STAT_EN(double strt, en);
DEBUG_STAT_EN(strt = get_wtime_millis());
if (cksum == CKSUM_CRC64) {
uint64_t *ck = (uint64_t *)cksum_buf;
*ck = lzma_crc64(buf, bytes, 0);
@ -125,6 +128,8 @@ compute_checksum(uchar_t *cksum_buf, int cksum, uchar_t *buf, int64_t bytes)
} else {
return (-1);
}
DEBUG_STAT_EN(en = get_wtime_millis());
DEBUG_STAT_EN(fprintf(stderr, "Checksum computed at %.3f MB/s\n", get_mb_s(bytes, strt, en)));
return (0);
}

2
crypto/crypto_utils.h
View file

@ -35,7 +35,7 @@ extern "C" {
#define MAX_PW_LEN 16
#define CKSUM_MASK 0x700
#define CKSUM_MAX_BYTES 64
#define DEFAULT_CKSUM "SKEIN256"
#define DEFAULT_CKSUM "KECCAK256"
#define ENCRYPT_FLAG 1
#define DECRYPT_FLAG 0

13
rabin/rabin_dedup.c
View file

@ -296,7 +296,7 @@ dedupe_compress(dedupe_context_t *ctx, uchar_t *buf, uint64_t *size, uint64_t of
heap_t heap;
DEBUG_STAT_EN(uint32_t max_count);
DEBUG_STAT_EN(max_count = 0);
DEBUG_STAT_EN(double strt, en);
DEBUG_STAT_EN(double strt, en_1, en);
length = offset;
last_offset = 0;
@ -342,7 +342,7 @@ dedupe_compress(dedupe_context_t *ctx, uchar_t *buf, uint64_t *size, uint64_t of
*/
ary_sz = 4 * ctx->rabin_poly_max_block_size;
fplist = (uint32_t *)(ctx->cbuf + ctx->real_chunksize - ary_sz);
memset(fplist, 0, ary_sz);
if (ctx->delta_flag) memset(fplist, 0, ary_sz);
}
memset(ctx->current_window_data, 0, RAB_POLYNOMIAL_WIN_SIZE);
@ -408,8 +408,10 @@ dedupe_compress(dedupe_context_t *ctx, uchar_t *buf, uint64_t *size, uint64_t of
* This is called minhashing and is used widely, for example in various
* search engines to detect similar documents.
*/
if (ctx->delta_flag) {
fplist[j] = cur_pos_checksum & 0xFFFFFFFFUL;
j++;
}
/*
* Window pos has to rotate from 0 .. RAB_POLYNOMIAL_WIN_SIZE-1
@ -484,13 +486,13 @@ dedupe_compress(dedupe_context_t *ctx, uchar_t *buf, uint64_t *size, uint64_t of
}
ctx->blocks[blknum]->similarity_hash = cur_sketch;
}
blknum++;
last_offset = *size;
}
process_blocks:
// If we found at least a few chunks, perform dedup.
DEBUG_STAT_EN(en_1 = get_wtime_millis());
DEBUG_STAT_EN(fprintf(stderr, "Original size: %" PRId64 ", blknum: %u\n", *size, blknum));
DEBUG_STAT_EN(fprintf(stderr, "Number of maxlen blocks: %u\n", max_count));
if (blknum > 2) {
@ -578,7 +580,7 @@ process_blocks:
break;
}
if (!length && ctx->delta_flag) {
if (ctx->delta_flag && !length) {
/*
* Look for similar blocks.
*/
@ -710,7 +712,8 @@ process_blocks:
DEBUG_STAT_EN(en = get_wtime_millis());
DEBUG_STAT_EN(fprintf(stderr, "Deduped size: %" PRId64 ", blknum: %u, delta_calls: %u, delta_fails: %u\n",
*size, blknum, delta_calls, delta_fails));
DEBUG_STAT_EN(fprintf(stderr, "Dedupe speed %.3f MB/s\n", get_mb_s(sz, strt, en)));
DEBUG_STAT_EN(fprintf(stderr, "Chunking speed %.3f MB/s, Overall Dedupe speed %.3f MB/s\n",
get_mb_s(sz, strt, en_1), get_mb_s(sz, strt, en)));
/*
* Remaining header entries: size of compressed index and size of
* compressed data are inserted later via rabin_update_hdr, after actual compression!