tests/benchmark/test_urcu_hash.h

   1 #ifndef _TEST_URCU_HASH_H
   2 #define _TEST_URCU_HASH_H
   3
   4 /*
   5  * test_urcu_hash.h
   6  *
   7  * Userspace RCU library - test program
   8  *
   9  * Copyright 2009-2012 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include <stdio.h>
  27 #include <pthread.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32 #include <unistd.h>
  33 #include <stdio.h>
  34 #include <assert.h>
  35 #include <errno.h>
  36 #include <signal.h>
  37
  38 #include <urcu/tls-compat.h>
  39 #include <compat-rand.h>
  40 #include "thread-id.h"
  41 #include "../common/debug-yield.h"
  42
  43 #define DEFAULT_HASH_SIZE       32
  44 #define DEFAULT_MIN_ALLOC_SIZE  1
  45 #define DEFAULT_RAND_POOL       1000000
  46
  47 /*
  48  * Note: the hash seed should be a random value for hash tables
  49  * targeting production environments to provide protection against
  50  * denial of service attacks. We keep it a static value within this test
  51  * program to compare identical benchmark runs.
  52  */
  53 #define TEST_HASH_SEED  0x42UL
  54
  55 /* hardcoded number of CPUs */
  56 #define NR_CPUS 16384
  57
  58 #ifdef POISON_FREE
  59 #define poison_free(ptr)                                \
  60         do {                                            \
  61                 memset(ptr, 0x42, sizeof(*(ptr)));      \
  62                 free(ptr);                              \
  63         } while (0)
  64 #else
  65 #define poison_free(ptr)        free(ptr)
  66 #endif
  67
  68 #ifndef DYNAMIC_LINK_TEST
  69 #define _LGPL_SOURCE
  70 #else
  71 #define debug_yield_read()
  72 #endif
  73 #include <urcu-qsbr.h>
  74 #include <urcu/rculfhash.h>
  75 #include <urcu-call-rcu.h>
  76
  77 struct wr_count {
  78         unsigned long update_ops;
  79         unsigned long add;
  80         unsigned long add_exist;
  81         unsigned long remove;
  82 };
  83
  84 extern DECLARE_URCU_TLS(unsigned int, rand_lookup);
  85 extern DECLARE_URCU_TLS(unsigned long, nr_add);
  86 extern DECLARE_URCU_TLS(unsigned long, nr_addexist);
  87 extern DECLARE_URCU_TLS(unsigned long, nr_del);
  88 extern DECLARE_URCU_TLS(unsigned long, nr_delnoent);
  89 extern DECLARE_URCU_TLS(unsigned long, lookup_fail);
  90 extern DECLARE_URCU_TLS(unsigned long, lookup_ok);
  91
  92 extern struct cds_lfht *test_ht;
  93
  94 struct test_data {
  95         int a;
  96         int b;
  97 };
  98
  99 struct lfht_test_node {
 100         struct cds_lfht_node node;
 101         void *key;
 102         unsigned int key_len;
 103         /* cache-cold for iteration */
 104         struct rcu_head head;
 105 };
 106
 107 static inline struct lfht_test_node *
 108 to_test_node(struct cds_lfht_node *node)
 109 {
 110         return caa_container_of(node, struct lfht_test_node, node);
 111 }
 112
 113 static inline
 114 void lfht_test_node_init(struct lfht_test_node *node, void *key,
 115                         size_t key_len)
 116 {
 117         cds_lfht_node_init(&node->node);
 118         node->key = key;
 119         node->key_len = key_len;
 120 }
 121
 122 static inline struct lfht_test_node *
 123 cds_lfht_iter_get_test_node(struct cds_lfht_iter *iter)
 124 {
 125         return to_test_node(cds_lfht_iter_get_node(iter));
 126 }
 127
 128 extern volatile int test_go, test_stop;
 129
 130 extern unsigned long wdelay;
 131
 132 extern unsigned long duration;
 133
 134 /* read-side C.S. duration, in loops */
 135 extern unsigned long rduration;
 136
 137 extern unsigned long init_hash_size;
 138 extern unsigned long min_hash_alloc_size;
 139 extern unsigned long max_hash_buckets_size;
 140 extern unsigned long init_populate;
 141 extern int opt_auto_resize;
 142 extern int add_only, add_unique, add_replace;
 143 extern const struct cds_lfht_mm_type *memory_backend;
 144
 145 extern unsigned long init_pool_offset, lookup_pool_offset, write_pool_offset;
 146 extern unsigned long init_pool_size,
 147         lookup_pool_size,
 148         write_pool_size;
 149 extern int validate_lookup;
 150
 151 extern unsigned long nr_hash_chains;
 152
 153 extern int count_pipe[2];
 154
 155 static inline void loop_sleep(unsigned long loops)
 156 {
 157         while (loops-- != 0)
 158                 caa_cpu_relax();
 159 }
 160
 161 extern int verbose_mode;
 162
 163 #define printf_verbose(fmt, args...)            \
 164         do {                                    \
 165                 if (verbose_mode)               \
 166                         printf(fmt, ## args);   \
 167         } while (0)
 168
 169 extern unsigned int cpu_affinities[NR_CPUS];
 170 extern unsigned int next_aff;
 171 extern int use_affinity;
 172
 173 extern pthread_mutex_t affinity_mutex;
 174
 175 void set_affinity(void);
 176
 177 /*
 178  * returns 0 if test should end.
 179  */
 180 static inline int test_duration_write(void)
 181 {
 182         return !test_stop;
 183 }
 184
 185 static inline int test_duration_read(void)
 186 {
 187         return !test_stop;
 188 }
 189
 190 extern DECLARE_URCU_TLS(unsigned long long, nr_writes);
 191 extern DECLARE_URCU_TLS(unsigned long long, nr_reads);
 192
 193 extern unsigned int nr_readers;
 194 extern unsigned int nr_writers;
 195
 196 void rcu_copy_mutex_lock(void);
 197 void rcu_copy_mutex_unlock(void);
 198
 199 /*
 200  * Hash function
 201  * Source: http://burtleburtle.net/bob/c/lookup3.c
 202  * Originally Public Domain
 203  */
 204
 205 #define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
 206
 207 #define mix(a, b, c) \
 208 do { \
 209         a -= c; a ^= rot(c,  4); c += b; \
 210         b -= a; b ^= rot(a,  6); a += c; \
 211         c -= b; c ^= rot(b,  8); b += a; \
 212         a -= c; a ^= rot(c, 16); c += b; \
 213         b -= a; b ^= rot(a, 19); a += c; \
 214         c -= b; c ^= rot(b,  4); b += a; \
 215 } while (0)
 216
 217 #define final(a, b, c) \
 218 { \
 219         c ^= b; c -= rot(b, 14); \
 220         a ^= c; a -= rot(c, 11); \
 221         b ^= a; b -= rot(a, 25); \
 222         c ^= b; c -= rot(b, 16); \
 223         a ^= c; a -= rot(c,  4);\
 224         b ^= a; b -= rot(a, 14); \
 225         c ^= b; c -= rot(b, 24); \
 226 }
 227
 228 static inline __attribute__((unused))
 229 uint32_t hash_u32(
 230         const uint32_t *k,      /* the key, an array of uint32_t values */
 231         size_t length,          /* the length of the key, in uint32_ts */
 232         uint32_t initval)       /* the previous hash, or an arbitrary value */
 233 {
 234         uint32_t a, b, c;
 235
 236         /* Set up the internal state */
 237         a = b = c = 0xdeadbeef + (((uint32_t) length) << 2) + initval;
 238
 239         /*----------------------------------------- handle most of the key */
 240         while (length > 3) {
 241                 a += k[0];
 242                 b += k[1];
 243                 c += k[2];
 244                 mix(a, b, c);
 245                 length -= 3;
 246                 k += 3;
 247         }
 248
 249         /*----------------------------------- handle the last 3 uint32_t's */
 250         switch (length) {       /* all the case statements fall through */
 251         case 3: c += k[2]; /* fall through */
 252         case 2: b += k[1]; /* fall through */
 253         case 1: a += k[0];
 254                 final(a, b, c);
 255                 /* fall through */
 256         case 0:                 /* case 0: nothing left to add */
 257                 break;
 258         }
 259         /*---------------------------------------------- report the result */
 260         return c;
 261 }
 262
 263 static inline
 264 void hashword2(
 265         const uint32_t *k,      /* the key, an array of uint32_t values */
 266         size_t length,          /* the length of the key, in uint32_ts */
 267         uint32_t *pc,           /* IN: seed OUT: primary hash value */
 268         uint32_t *pb)           /* IN: more seed OUT: secondary hash value */
 269 {
 270         uint32_t a, b, c;
 271
 272         /* Set up the internal state */
 273         a = b = c = 0xdeadbeef + ((uint32_t) (length << 2)) + *pc;
 274         c += *pb;
 275
 276         /*----------------------------------------- handle most of the key */
 277         while (length > 3) {
 278                 a += k[0];
 279                 b += k[1];
 280                 c += k[2];
 281                 mix(a, b, c);
 282                 length -= 3;
 283                 k += 3;
 284         }
 285
 286         /*----------------------------------- handle the last 3 uint32_t's */
 287         switch (length) {       /* all the case statements fall through */
 288         case 3: c += k[2]; /* fall through */
 289         case 2: b += k[1]; /* fall through */
 290         case 1: a += k[0];
 291                 final(a, b, c);
 292                 /* fall through */
 293         case 0:                 /* case 0: nothing left to add */
 294                 break;
 295         }
 296         /*---------------------------------------------- report the result */
 297         *pc = c;
 298         *pb = b;
 299 }
 300
 301 #if (CAA_BITS_PER_LONG == 32)
 302 static inline
 303 unsigned long test_hash_mix(const void *_key, size_t length, unsigned long seed)
 304 {
 305         unsigned int key = (unsigned int) _key;
 306
 307         assert(length == sizeof(unsigned int));
 308         return hash_u32(&key, 1, seed);
 309 }
 310 #else
 311 static inline
 312 unsigned long test_hash_mix(const void *_key, size_t length, unsigned long seed)
 313 {
 314         union {
 315                 uint64_t v64;
 316                 uint32_t v32[2];
 317         } v;
 318         union {
 319                 uint64_t v64;
 320                 uint32_t v32[2];
 321         } key;
 322
 323         assert(length == sizeof(unsigned long));
 324         v.v64 = (uint64_t) seed;
 325         key.v64 = (uint64_t) _key;
 326         hashword2(key.v32, 2, &v.v32[0], &v.v32[1]);
 327         return v.v64;
 328 }
 329 #endif
 330
 331 /*
 332  * Hash function with nr_hash_chains != 0 for testing purpose only!
 333  * Creates very long hash chains, deteriorating the hash table into a
 334  * few linked lists, depending on the nr_hash_chains value. The purpose
 335  * of this test is to check how the hash table behaves with hash chains
 336  * containing different values, which is a rare case in a normal hash
 337  * table.
 338  */
 339 static inline
 340 unsigned long test_hash(const void *_key, size_t length,
 341                         unsigned long seed)
 342 {
 343         if (nr_hash_chains == 0) {
 344                 return test_hash_mix(_key, length, seed);
 345         } else {
 346                 unsigned long v;
 347
 348                 assert(length == sizeof(unsigned long));
 349                 v = (unsigned long) _key;
 350                 return v % nr_hash_chains;
 351         }
 352 }
 353
 354 unsigned long test_compare(const void *key1, size_t key1_len,
 355                            const void *key2, size_t key2_len);
 356
 357 static inline
 358 int test_match(struct cds_lfht_node *node, const void *key)
 359 {
 360         struct lfht_test_node *test_node = to_test_node(node);
 361
 362         return !test_compare(test_node->key, test_node->key_len,
 363                         key, sizeof(unsigned long));
 364 }
 365
 366 static inline
 367 void cds_lfht_test_lookup(struct cds_lfht *ht, void *key, size_t key_len,
 368                 struct cds_lfht_iter *iter)
 369 {
 370         assert(key_len == sizeof(unsigned long));
 371
 372         cds_lfht_lookup(ht, test_hash(key, key_len, TEST_HASH_SEED),
 373                         test_match, key, iter);
 374 }
 375
 376 void free_node_cb(struct rcu_head *head);
 377
 378 /* rw test */
 379 void test_hash_rw_sigusr1_handler(int signo);
 380 void test_hash_rw_sigusr2_handler(int signo);
 381 void *test_hash_rw_thr_reader(void *_count);
 382 void *test_hash_rw_thr_writer(void *_count);
 383 int test_hash_rw_populate_hash(void);
 384
 385 /* unique test */
 386 void test_hash_unique_sigusr1_handler(int signo);
 387 void test_hash_unique_sigusr2_handler(int signo);
 388 void *test_hash_unique_thr_reader(void *_count);
 389 void *test_hash_unique_thr_writer(void *_count);
 390 int test_hash_unique_populate_hash(void);
 391
 392 #endif /* _TEST_URCU_HASH_H */