Simplify the BDZ compression function, making it smaller at the same
time. Fixes a bug where non-minimal hash functions could be created. Add regression tests for BDZ, including the map output functionality.
This commit is contained in:
joerg
parent
d0eacb2c29
commit
4edfbdbb40
@ -1,5 +1,5 @@
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#!/bin/sh
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# $NetBSD: h_nbperf.sh,v 1.1 2012/07/22 20:38:20 joerg Exp $
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# $NetBSD: h_nbperf.sh,v 1.2 2012/09/25 20:53:46 joerg Exp $
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#
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# Copyright (c) 2012 The NetBSD Foundation, Inc.
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# All rights reserved.
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@ -27,6 +27,6 @@
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#
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set -e
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head -n $4 $1 | nbperf -a $2 > hash.c 2> /dev/null
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head -n $4 $1 | nbperf -m hash.map -o hash.c -a $2 2> /dev/null
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cc -o testprog -I. $5
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head -n $4 $1 | ./testprog | $3
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@ -1,4 +1,4 @@
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/* $NetBSD: hash_driver.c,v 1.1 2012/07/22 20:38:20 joerg Exp $ */
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/* $NetBSD: hash_driver.c,v 1.2 2012/09/25 20:53:46 joerg Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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@ -46,7 +46,7 @@ main(void)
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while ((len = getline(&line, &len, stdin)) > 0) {
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if (len && line[len - 1] == '\n')
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--len;
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printf("%" PRId32 "\n", 1 + hash(line, len));
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printf("%" PRId32 "\n", hash(line, len));
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}
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free(line);
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return 0;
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@ -1,4 +1,4 @@
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# $NetBSD: t_nbperf.sh,v 1.1 2012/07/22 20:38:20 joerg Exp $
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# $NetBSD: t_nbperf.sh,v 1.2 2012/09/25 20:53:46 joerg Exp $
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#
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# Copyright (c) 2012 The NetBSD Foundation, Inc.
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# All rights reserved.
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@ -27,7 +27,7 @@
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cleanup()
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{
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rm -f reference.txt hash.c testprog
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rm -f reference.txt hash.c hash.map testprog
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}
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atf_test_case chm
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@ -38,10 +38,13 @@ chm_head()
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chm_body()
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{
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for n in 4 32 128 1024 65536; do
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seq $n > reference.txt
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seq 0 $(($n - 1)) > reference.txt
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atf_check -o file:reference.txt \
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$(atf_get_srcdir)/h_nbperf /usr/share/dict/web2 chm cat \
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$n $(atf_get_srcdir)/hash_driver.c
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atf_check -o file:hash.map \
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$(atf_get_srcdir)/h_nbperf /usr/share/dict/web2 chm cat \
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$n $(atf_get_srcdir)/hash_driver.c
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done
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}
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chm_clean()
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@ -57,10 +60,13 @@ chm3_head()
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chm3_body()
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{
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for n in 4 32 128 1024 65536; do
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seq $n > reference.txt
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seq 0 $(($n - 1)) > reference.txt
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atf_check -o file:reference.txt \
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$(atf_get_srcdir)/h_nbperf /usr/share/dict/web2 chm3 cat \
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$n $(atf_get_srcdir)/hash_driver.c
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atf_check -o file:hash.map \
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$(atf_get_srcdir)/h_nbperf /usr/share/dict/web2 chm3 cat \
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$n $(atf_get_srcdir)/hash_driver.c
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done
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}
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chm3_clean()
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@ -68,8 +74,31 @@ chm3_clean()
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cleanup
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}
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atf_test_case bdz
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bdz_head()
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{
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atf_set "descr" "Checks bdz algorithm"
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}
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bdz_body()
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{
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for n in 4 32 128 1024 65536 131072; do
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seq 0 $(($n - 1)) > reference.txt
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atf_check -o file:reference.txt \
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$(atf_get_srcdir)/h_nbperf /usr/share/dict/web2 bdz "sort -n" \
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$n $(atf_get_srcdir)/hash_driver.c
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atf_check -o file:hash.map \
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$(atf_get_srcdir)/h_nbperf /usr/share/dict/web2 bdz cat \
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$n $(atf_get_srcdir)/hash_driver.c
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done
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}
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bdz_clean()
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{
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cleanup
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}
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atf_init_test_cases()
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{
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atf_add_test_case chm
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atf_add_test_case chm3
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atf_add_test_case bdz
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}
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@ -1,6 +1,6 @@
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/* $NetBSD: nbperf-bdz.c,v 1.4 2011/10/21 23:47:11 joerg Exp $ */
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/* $NetBSD: nbperf-bdz.c,v 1.5 2012/09/25 20:53:46 joerg Exp $ */
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/*-
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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* Copyright (c) 2009, 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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@ -36,7 +36,7 @@
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#endif
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: nbperf-bdz.c,v 1.4 2011/10/21 23:47:11 joerg Exp $");
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__RCSID("$NetBSD: nbperf-bdz.c,v 1.5 2012/09/25 20:53:46 joerg Exp $");
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#include <err.h>
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#include <inttypes.h>
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@ -72,10 +72,7 @@ struct state {
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struct graph3 graph;
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uint32_t *visited;
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uint32_t *holes64k;
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uint16_t *holes256;
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uint8_t *holes256_64;
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uint8_t *holes256_128;
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uint8_t *holes256_192;
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uint16_t *holes64;
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uint8_t *g;
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uint32_t *result_map;
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};
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@ -123,17 +120,8 @@ assign_nodes(struct state *state)
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if (i % 65536 == 0)
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state->holes64k[i >> 16] = holes;
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if (i % 256 == 0)
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state->holes256[i >> 8] = holes - state->holes64k[i >> 16];
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if (i % 256 == 64)
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state->holes256_64[i >> 8] = holes - state->holes256[i >> 8] - state->holes64k[i >> 16];
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if (i % 256 == 128)
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state->holes256_128[i >> 8] = holes - state->holes256[i >> 8] - state->holes64k[i >> 16];
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if (i % 256 == 192)
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state->holes256_192[i >> 8] = holes - state->holes256[i >> 8] - state->holes64k[i >> 16];
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if (i % 64 == 0)
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state->holes64[i >> 6] = holes - state->holes64k[i >> 16];
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if (state->visited[i] > 1) {
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j = state->visited[i] - 2;
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@ -143,28 +131,13 @@ assign_nodes(struct state *state)
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if (state->g[i] == 3)
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++holes;
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}
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if (i % 65536 != 0)
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state->holes64k[(i >> 16) + 1] = holes;
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if (i % 256 != 0)
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state->holes256[(i >> 8) + 1] = holes - state->holes64k[((i >> 8) + 1) >> 8];
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if (i % 256 != 64)
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state->holes256_64[(i >> 8) + 1] = holes - state->holes256[(i >> 8) + 1] - state->holes64k[((i >> 8) + 1) >> 8];
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if (i % 256 != 128)
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state->holes256_128[(i >> 8) + 1] = holes - state->holes256[(i >> 8) + 1] - state->holes64k[((i >> 8) + 1) >> 8];
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if (i % 256 != 192)
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state->holes256_192[(i >> 8) + 1] = holes - state->holes256[(i >> 8) + 1] - state->holes64k[((i >> 8) + 1) >> 8];
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}
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static void
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print_hash(struct nbperf *nbperf, struct state *state)
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{
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size_t i, j;
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uint32_t sum;
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uint64_t sum;
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size_t i;
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fprintf(nbperf->output, "#include <stdlib.h>\n");
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fprintf(nbperf->output, "#include <strings.h>\n\n");
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@ -175,19 +148,50 @@ print_hash(struct nbperf *nbperf, struct state *state)
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"%s(const void * __restrict key, size_t keylen)\n",
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nbperf->hash_name);
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fprintf(nbperf->output, "{\n");
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fprintf(nbperf->output,
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"\tstatic const uint32_t g[%" PRId32 "] = {\n",
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(state->graph.v + 15) / 16);
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for (i = 0; i < state->graph.v; i += 16) {
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for (j = 0, sum = 0; j < 16; ++j)
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sum |= (uint32_t)state->g[i + j] << (2 * j);
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fprintf(nbperf->output, "%s0x%08" PRIx32 "ULL,%s",
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(i / 16 % 4 == 0 ? "\t " : " "),
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sum,
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(i / 16 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint64_t g1[%" PRId32 "] = {\n",
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(state->graph.v + 63) / 64);
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sum = 0;
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for (i = 0; i < state->graph.v; ++i) {
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sum |= ((uint64_t)state->g[i] & 1) << (i & 63);
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if (i % 64 == 63) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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sum = 0;
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}
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}
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fprintf(nbperf->output, "%s\t};\n", (i / 16 % 4 ? "\n" : ""));
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if (i % 64 != 0) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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}
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fprintf(nbperf->output, "%s\t};\n", (i % 2 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint64_t g2[%" PRId32 "] = {\n",
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(state->graph.v + 63) / 64);
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sum = 0;
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for (i = 0; i < state->graph.v; ++i) {
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sum |= (((uint64_t)state->g[i] & 2) >> 1) << (i & 63);
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if (i % 64 == 63) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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sum = 0;
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}
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}
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if (i % 64 != 0) {
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fprintf(nbperf->output, "%s0x%016" PRIx64 "ULL,%s",
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(i / 64 % 2 == 0 ? "\t " : " "),
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sum,
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(i / 64 % 2 == 1 ? "\n" : ""));
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}
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fprintf(nbperf->output, "%s\t};\n", (i % 2 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint32_t holes64k[%" PRId32 "] = {\n",
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@ -200,111 +204,45 @@ print_hash(struct nbperf *nbperf, struct state *state)
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fprintf(nbperf->output, "%s\t};\n", (i / 65536 % 4 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint16_t holes256[%" PRId32 "] = {\n",
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(state->graph.v + 255) / 256);
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for (i = 0; i < state->graph.v; i += 256)
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"\tstatic const uint16_t holes64[%" PRId32 "] = {\n",
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(state->graph.v + 63) / 64);
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for (i = 0; i < state->graph.v; i += 64)
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fprintf(nbperf->output, "%s0x%04" PRIx32 ",%s",
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(i / 256 % 4 == 0 ? "\t " : " "),
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state->holes256[i >> 8],
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(i / 256 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output, "%s\t};\n", (i / 256 % 4 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint8_t holes256_64[%" PRId32 "] = {\n",
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(state->graph.v + 255) / 256);
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for (i = 64; i < state->graph.v; i += 256)
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fprintf(nbperf->output, "%s0x%02" PRIx32 ",%s",
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(i / 256 % 4 == 0 ? "\t " : " "),
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state->holes256_64[i >> 8],
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(i / 256 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output, "%s\t};\n", (i / 256 % 4 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint8_t holes256_128[%" PRId32 "] = {\n",
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(state->graph.v + 255) / 256);
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for (i = 128; i < state->graph.v; i += 256)
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fprintf(nbperf->output, "%s0x%02" PRIx32 ",%s",
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(i / 256 % 4 == 0 ? "\t " : " "),
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state->holes256_128[i >> 8],
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(i / 256 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output, "%s\t};\n", (i / 256 % 4 ? "\n" : ""));
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fprintf(nbperf->output,
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"\tstatic const uint8_t holes256_192[%" PRId32 "] = {\n",
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(state->graph.v + 255) / 256);
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for (i = 192; i < state->graph.v; i += 256)
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fprintf(nbperf->output, "%s0x%02" PRIx32 ",%s",
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(i / 256 % 4 == 0 ? "\t " : " "),
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state->holes256_192[i >> 8],
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(i / 256 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output, "%s\t};\n", (i / 256 % 4 ? "\n" : ""));
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(i / 64 % 4 == 0 ? "\t " : " "),
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state->holes64[i >> 6],
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(i / 64 % 4 == 3 ? "\n" : ""));
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fprintf(nbperf->output, "%s\t};\n", (i / 64 % 4 ? "\n" : ""));
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fprintf(nbperf->output, "\tuint64_t m;\n");
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fprintf(nbperf->output, "\tuint32_t idx, i, idx2;\n");
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fprintf(nbperf->output, "\tuint32_t h[%zu];\n\n", nbperf->hash_size);
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fprintf(nbperf->output, "\tuint32_t m;\n");
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fprintf(nbperf->output, "\tuint32_t a1, a2, b1, b2, c1, c2, idx, idx2;\n\n");
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(*nbperf->print_hash)(nbperf, "\t", "key", "keylen", "h");
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fprintf(nbperf->output, "\n\th[0] = h[0] %% %" PRIu32 ";\n", state->graph.v);
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fprintf(nbperf->output, "\th[1] = h[1] %% %" PRIu32 ";\n", state->graph.v);
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fprintf(nbperf->output, "\th[2] = h[2] %% %" PRIu32 ";\n", state->graph.v);
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fprintf(nbperf->output, "\n\ta1 = h[0] >> 4;\n");
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fprintf(nbperf->output, "\ta2 = 2 * (h[0] & 15);\n");
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fprintf(nbperf->output, "\tb1 = h[1] >> 4;\n");
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fprintf(nbperf->output, "\tb2 = 2 * (h[1] & 15);\n");
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fprintf(nbperf->output, "\tc1 = h[2] >> 4;\n");
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fprintf(nbperf->output, "\tc2 = 2 * (h[2] & 15);\n");
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fprintf(nbperf->output, "\n\th[0] = h[0] %% %" PRIu32 ";\n",
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state->graph.v);
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fprintf(nbperf->output, "\th[1] = h[1] %% %" PRIu32 ";\n",
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state->graph.v);
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fprintf(nbperf->output, "\th[2] = h[2] %% %" PRIu32 ";\n",
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state->graph.v);
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fprintf(nbperf->output,
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"\tidx = h[(((g[a1] >> a2) & 3) + ((g[b1] >> b2) & 3) +\n"
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"\t ((g[c1] >> c2) & 3)) %% 3];\n\n");
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"\tidx = 9 + ((g1[h[0] >> 6] >> (h[0] & 63)) &1)"
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"\t + ((g1[h[1] >> 6] >> (h[1] & 63)) & 1)"
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"\t + ((g1[h[2] >> 6] >> (h[2] & 63)) & 1)"
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"\t - ((g2[h[0] >> 6] >> (h[0] & 63)) & 1)"
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"\t - ((g2[h[1] >> 6] >> (h[1] & 63)) & 1)"
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"\t - ((g2[h[2] >> 6] >> (h[2] & 63)) & 1);"
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);
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fprintf(nbperf->output,
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"\tswitch ((idx >> 5) & 7) {\n"
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"\tcase 0:\n"
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"\t\tidx2 = idx - holes64k[idx >> 16] - holes256[idx >> 8];\n"
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"\t\tbreak;\n"
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"\tcase 1: case 2:\n"
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"\t\tidx2 = idx - holes64k[idx >> 16] - holes256[idx >> 8]\n"
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"\t\t - holes256_64[idx >> 8];\n"
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"\t\tbreak;\n"
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"\tcase 3: case 4:\n"
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"\t\tidx2 = idx - holes64k[idx >> 16] - holes256[idx >> 8]\n"
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"\t\t - holes256_128[idx >> 8];\n"
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"\t\tbreak;\n"
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"\tcase 5: case 6:\n"
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"\t\tidx2 = idx - holes64k[idx >> 16] - holes256[idx >> 8]\n"
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"\t\t - holes256_192[idx >> 8];\n"
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"\t\tbreak;\n"
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"\tcase 7:\n"
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"\t\tidx2 = idx - holes64k[(idx + 32) >> 16] -\n"
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"\t\t holes256[(idx + 32) >> 8];\n"
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"\t\tbreak;\n"
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"\tdefault:\n"
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"\t\tabort();\n"
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"\t}\n"
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"\tswitch ((idx >> 4) & 3) {\n"
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"\tcase 1:\n"
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"\t\tm = (g[(idx >> 4) - 1] & (g[(idx >> 4) - 1] >> 1) & 0x55555555U);\n"
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"\t\tidx2 -= popcount32(m);\n"
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"\tcase 0:\n"
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"\t\tm = (g[idx >> 4] & (g[idx >> 4] >> 1) & 0x55555555U);\n"
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"\t\tm &= ((2U << (2 * (idx & 15))) - 1);\n"
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"\t\tidx2 -= popcount32(m);\n"
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"\t\tbreak;\n"
|
||||
"\tcase 2:\n"
|
||||
"\t\tm = (g[(idx >> 4) + 1] & (g[(idx >> 4) + 1] >> 1) & 0x55555555U);\n"
|
||||
"\t\tidx2 += popcount32(m);\n"
|
||||
"\tcase 3:\n"
|
||||
"\t\tm = (g[idx >> 4] & (g[idx >> 4] >> 1) & 0x55555555U);\n"
|
||||
"\t\tm &= ~((2U << (2 * (idx & 15))) - 1);\n"
|
||||
"\t\tidx2 += popcount32(m);\n"
|
||||
"\t\tbreak;\n"
|
||||
"\t}\n\n");
|
||||
|
||||
"\tidx = h[idx %% 3];\n");
|
||||
fprintf(nbperf->output,
|
||||
"\treturn idx2;\n");
|
||||
"\tidx2 = idx - holes64[idx >> 6] - holes64k[idx >> 16];\n"
|
||||
"\tidx2 -= popcount64(g1[idx >> 6] & g2[idx >> 6]\n"
|
||||
"\t & (((uint64_t)1 << idx) - 1));\n"
|
||||
"\treturn idx2;");
|
||||
|
||||
fprintf(nbperf->output, "}\n");
|
||||
|
||||
if (nbperf->map_output != NULL) {
|
||||
@ -338,19 +276,15 @@ bdz_compute(struct nbperf *nbperf)
|
||||
|
||||
graph3_setup(&state.graph, v, e);
|
||||
|
||||
state.holes64k = calloc(sizeof(uint32_t), (v + 65535) / 65536 + 1);
|
||||
state.holes256 = calloc(sizeof(uint16_t), (v + 255) / 256 + 1);
|
||||
state.holes256_64 = calloc(sizeof(uint8_t), (v + 255) / 256 + 1);
|
||||
state.holes256_128 = calloc(sizeof(uint8_t), (v + 255) / 256 + 1);
|
||||
state.holes256_192 = calloc(sizeof(uint8_t), (v + 255) / 256 + 1);
|
||||
state.g = calloc(sizeof(uint32_t), v);
|
||||
state.holes64k = calloc(sizeof(uint32_t), (v + 65535) / 65536);
|
||||
state.holes64 = calloc(sizeof(uint16_t), (v + 63) / 64 );
|
||||
state.g = calloc(sizeof(uint32_t), v | 63);
|
||||
state.visited = calloc(sizeof(uint32_t), v);
|
||||
state.result_map = calloc(sizeof(uint32_t), e);
|
||||
|
||||
if (state.holes64k == NULL || state.holes256 == NULL ||
|
||||
state.holes256_64 == NULL || state.holes256_128 == NULL ||
|
||||
state.holes256_192 == NULL || state.g == NULL ||
|
||||
state.visited == NULL || state.result_map == NULL)
|
||||
if (state.holes64k == NULL || state.holes64 == NULL ||
|
||||
state.g == NULL || state.visited == NULL ||
|
||||
state.result_map == NULL)
|
||||
err(1, "malloc failed");
|
||||
|
||||
if (graph3_hash(nbperf, &state.graph))
|
||||
@ -367,10 +301,7 @@ failed:
|
||||
free(state.visited);
|
||||
free(state.g);
|
||||
free(state.holes64k);
|
||||
free(state.holes256);
|
||||
free(state.holes256_64);
|
||||
free(state.holes256_128);
|
||||
free(state.holes256_192);
|
||||
free(state.holes64);
|
||||
free(state.result_map);
|
||||
return retval;
|
||||
}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
.\" $NetBSD: nbperf.1,v 1.4 2012/05/31 21:36:06 joerg Exp $
|
||||
.\" $NetBSD: nbperf.1,v 1.5 2012/09/25 20:53:46 joerg Exp $
|
||||
.\"
|
||||
.\" Copyright (c) 2009 The NetBSD Foundation, Inc.
|
||||
.\" All rights reserved.
|
||||
@ -27,7 +27,7 @@
|
||||
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
.\" POSSIBILITY OF SUCH DAMAGE.
|
||||
.\"
|
||||
.Dd May 31, 2012
|
||||
.Dd September 25, 2012
|
||||
.Dt NBPERF 1
|
||||
.Os
|
||||
.Sh NAME
|
||||
@ -90,7 +90,7 @@ noticable smaller than the output for
|
||||
.Ar chm .
|
||||
.It Sy bdz
|
||||
This results in a non-order preserving minimal perfect hash function.
|
||||
Output size is approximately 2.85 bit per key for the default value of
|
||||
Output size is approximately 2.79 bit per key for the default value of
|
||||
.Ar utilisation ,
|
||||
1.24.
|
||||
This is also the smallest supported value.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user