tests/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 "../config.h"
  27 #include <stdio.h>
  28 #include <pthread.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <unistd.h>
  34 #include <stdio.h>
  35 #include <assert.h>
  36 #include <errno.h>
  37 #include <signal.h>
  38
  39 #include <urcu/tls-compat.h>
  40 #include "cpuset.h"
  41 #include "thread-id.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 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
  56 #define CACHE_LINE_SIZE 4096
  57
  58 /* hardcoded number of CPUs */
  59 #define NR_CPUS 16384
  60
  61 #ifdef POISON_FREE
  62 #define poison_free(ptr)                                \
  63         do {                                            \
  64                 memset(ptr, 0x42, sizeof(*(ptr)));      \
  65                 free(ptr);                              \
  66         } while (0)
  67 #else
  68 #define poison_free(ptr)        free(ptr)
  69 #endif
  70
  71 #ifndef DYNAMIC_LINK_TEST
  72 #define _LGPL_SOURCE
  73 #else
  74 #define debug_yield_read()
  75 #endif
  76 #include <urcu-qsbr.h>
  77 #include <urcu/rculfhash.h>
  78 #include <urcu-call-rcu.h>
  79
  80 struct wr_count {
  81         unsigned long update_ops;
  82         unsigned long add;
  83         unsigned long add_exist;
  84         unsigned long remove;
  85 };
  86
  87 extern DECLARE_URCU_TLS(unsigned int, rand_lookup);
  88 extern DECLARE_URCU_TLS(unsigned long, nr_add);
  89 extern DECLARE_URCU_TLS(unsigned long, nr_addexist);
  90 extern DECLARE_URCU_TLS(unsigned long, nr_del);
  91 extern DECLARE_URCU_TLS(unsigned long, nr_delnoent);
  92 extern DECLARE_URCU_TLS(unsigned long, lookup_fail);
  93 extern DECLARE_URCU_TLS(unsigned long, lookup_ok);
  94
  95 extern struct cds_lfht *test_ht;
  96
  97 struct test_data {
  98         int a;
  99         int b;
 100 };
 101
 102 struct lfht_test_node {
 103         struct cds_lfht_node node;
 104         void *key;
 105         unsigned int key_len;
 106         /* cache-cold for iteration */
 107         struct rcu_head head;
 108 };
 109
 110 static inline struct lfht_test_node *
 111 to_test_node(struct cds_lfht_node *node)
 112 {
 113         return caa_container_of(node, struct lfht_test_node, node);
 114 }
 115
 116 static inline
 117 void lfht_test_node_init(struct lfht_test_node *node, void *key,
 118                         size_t key_len)
 119 {
 120         cds_lfht_node_init(&node->node);
 121         node->key = key;
 122         node->key_len = key_len;
 123 }
 124
 125 static inline struct lfht_test_node *
 126 cds_lfht_iter_get_test_node(struct cds_lfht_iter *iter)
 127 {
 128         return to_test_node(cds_lfht_iter_get_node(iter));
 129 }
 130
 131 extern volatile int test_go, test_stop;
 132
 133 extern unsigned long wdelay;
 134
 135 extern unsigned long duration;
 136
 137 /* read-side C.S. duration, in loops */
 138 extern unsigned long rduration;
 139
 140 extern unsigned long init_hash_size;
 141 extern unsigned long min_hash_alloc_size;
 142 extern unsigned long max_hash_buckets_size;
 143 extern unsigned long init_populate;
 144 extern int opt_auto_resize;
 145 extern int add_only, add_unique, add_replace;
 146 extern const struct cds_lfht_mm_type *memory_backend;
 147
 148 extern unsigned long init_pool_offset, lookup_pool_offset, write_pool_offset;
 149 extern unsigned long init_pool_size,
 150         lookup_pool_size,
 151         write_pool_size;
 152 extern int validate_lookup;
 153
 154 extern unsigned long nr_hash_chains;
 155
 156 extern int count_pipe[2];
 157
 158 static inline void loop_sleep(unsigned long loops)
 159 {
 160         while (loops-- != 0)
 161                 caa_cpu_relax();
 162 }
 163
 164 extern int verbose_mode;
 165
 166 #define printf_verbose(fmt, args...)            \
 167         do {                                    \
 168                 if (verbose_mode)               \
 169                         printf(fmt, ## args);   \
 170         } while (0)
 171
 172 extern unsigned int cpu_affinities[NR_CPUS];
 173 extern unsigned int next_aff;
 174 extern int use_affinity;
 175
 176 extern pthread_mutex_t affinity_mutex;
 177
 178 void set_affinity(void);
 179
 180 /*
 181  * returns 0 if test should end.
 182  */
 183 static inline int test_duration_write(void)
 184 {
 185         return !test_stop;
 186 }
 187
 188 static inline int test_duration_read(void)
 189 {
 190         return !test_stop;
 191 }
 192
 193 extern DECLARE_URCU_TLS(unsigned long long, nr_writes);
 194 extern DECLARE_URCU_TLS(unsigned long long, nr_reads);
 195
 196 extern unsigned int nr_readers;
 197 extern unsigned int nr_writers;
 198
 199 void rcu_copy_mutex_lock(void);
 200 void rcu_copy_mutex_unlock(void);
 201
 202 /*
 203  * Hash function
 204  * Source: http://burtleburtle.net/bob/c/lookup3.c
 205  * Originally Public Domain
 206  */
 207
 208 #define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
 209
 210 #define mix(a, b, c) \
 211 do { \
 212         a -= c; a ^= rot(c,  4); c += b; \
 213         b -= a; b ^= rot(a,  6); a += c; \
 214         c -= b; c ^= rot(b,  8); b += a; \
 215         a -= c; a ^= rot(c, 16); c += b; \
 216         b -= a; b ^= rot(a, 19); a += c; \
 217         c -= b; c ^= rot(b,  4); b += a; \
 218 } while (0)
 219
 220 #define final(a, b, c) \
 221 { \
 222         c ^= b; c -= rot(b, 14); \
 223         a ^= c; a -= rot(c, 11); \
 224         b ^= a; b -= rot(a, 25); \
 225         c ^= b; c -= rot(b, 16); \
 226         a ^= c; a -= rot(c,  4);\
 227         b ^= a; b -= rot(a, 14); \
 228         c ^= b; c -= rot(b, 24); \
 229 }
 230
 231 static inline __attribute__((unused))
 232 uint32_t hash_u32(
 233         const uint32_t *k,      /* the key, an array of uint32_t values */
 234         size_t length,          /* the length of the key, in uint32_ts */
 235         uint32_t initval)       /* the previous hash, or an arbitrary value */
 236 {
 237         uint32_t a, b, c;
 238
 239         /* Set up the internal state */
 240         a = b = c = 0xdeadbeef + (((uint32_t) length) << 2) + initval;
 241
 242         /*----------------------------------------- handle most of the key */
 243         while (length > 3) {
 244                 a += k[0];
 245                 b += k[1];
 246                 c += k[2];
 247                 mix(a, b, c);
 248                 length -= 3;
 249                 k += 3;
 250         }
 251
 252         /*----------------------------------- handle the last 3 uint32_t's */
 253         switch (length) {       /* all the case statements fall through */
 254         case 3: c += k[2];
 255         case 2: b += k[1];
 256         case 1: a += k[0];
 257                 final(a, b, c);
 258         case 0:                 /* case 0: nothing left to add */
 259                 break;
 260         }
 261         /*---------------------------------------------- report the result */
 262         return c;
 263 }
 264
 265 static inline
 266 void hashword2(
 267         const uint32_t *k,      /* the key, an array of uint32_t values */
 268         size_t length,          /* the length of the key, in uint32_ts */
 269         uint32_t *pc,           /* IN: seed OUT: primary hash value */
 270         uint32_t *pb)           /* IN: more seed OUT: secondary hash value */
 271 {
 272         uint32_t a, b, c;
 273
 274         /* Set up the internal state */
 275         a = b = c = 0xdeadbeef + ((uint32_t) (length << 2)) + *pc;
 276         c += *pb;
 277
 278         /*----------------------------------------- handle most of the key */
 279         while (length > 3) {
 280                 a += k[0];
 281                 b += k[1];
 282                 c += k[2];
 283                 mix(a, b, c);
 284                 length -= 3;
 285                 k += 3;
 286         }
 287
 288         /*----------------------------------- handle the last 3 uint32_t's */
 289         switch (length) {       /* all the case statements fall through */
 290         case 3: c += k[2];
 291         case 2: b += k[1];
 292         case 1: a += k[0];
 293                 final(a, b, c);
 294         case 0:                 /* case 0: nothing left to add */
 295                 break;
 296         }
 297         /*---------------------------------------------- report the result */
 298         *pc = c;
 299         *pb = b;
 300 }
 301
 302 #if (CAA_BITS_PER_LONG == 32)
 303 static inline
 304 unsigned long test_hash_mix(const void *_key, size_t length, unsigned long seed)
 305 {
 306         unsigned int key = (unsigned int) _key;
 307
 308         assert(length == sizeof(unsigned int));
 309         return hash_u32(&key, 1, seed);
 310 }
 311 #else
 312 static inline
 313 unsigned long test_hash_mix(const void *_key, size_t length, unsigned long seed)
 314 {
 315         union {
 316                 uint64_t v64;
 317                 uint32_t v32[2];
 318         } v;
 319         union {
 320                 uint64_t v64;
 321                 uint32_t v32[2];
 322         } key;
 323
 324         assert(length == sizeof(unsigned long));
 325         v.v64 = (uint64_t) seed;
 326         key.v64 = (uint64_t) _key;
 327         hashword2(key.v32, 2, &v.v32[0], &v.v32[1]);
 328         return v.v64;
 329 }
 330 #endif
 331
 332 /*
 333  * Hash function with nr_hash_chains != 0 for testing purpose only!
 334  * Creates very long hash chains, deteriorating the hash table into a
 335  * few linked lists, depending on the nr_hash_chains value. The purpose
 336  * of this test is to check how the hash table behaves with hash chains
 337  * containing different values, which is a rare case in a normal hash
 338  * table.
 339  */
 340 static inline
 341 unsigned long test_hash(const void *_key, size_t length,
 342                         unsigned long seed)
 343 {
 344         if (nr_hash_chains == 0) {
 345                 return test_hash_mix(_key, length, seed);
 346         } else {
 347                 unsigned long v;
 348
 349                 assert(length == sizeof(unsigned long));
 350                 v = (unsigned long) _key;
 351                 return v % nr_hash_chains;
 352         }
 353 }
 354
 355 unsigned long test_compare(const void *key1, size_t key1_len,
 356                            const void *key2, size_t key2_len);
 357
 358 static inline
 359 int test_match(struct cds_lfht_node *node, const void *key)
 360 {
 361         struct lfht_test_node *test_node = to_test_node(node);
 362
 363         return !test_compare(test_node->key, test_node->key_len,
 364                         key, sizeof(unsigned long));
 365 }
 366
 367 static inline
 368 void cds_lfht_test_lookup(struct cds_lfht *ht, void *key, size_t key_len,
 369                 struct cds_lfht_iter *iter)
 370 {
 371         assert(key_len == sizeof(unsigned long));
 372
 373         cds_lfht_lookup(ht, test_hash(key, key_len, TEST_HASH_SEED),
 374                         test_match, key, iter);
 375 }
 376
 377 void free_node_cb(struct rcu_head *head);
 378
 379 /* rw test */
 380 void test_hash_rw_sigusr1_handler(int signo);
 381 void test_hash_rw_sigusr2_handler(int signo);
 382 void *test_hash_rw_thr_reader(void *_count);
 383 void *test_hash_rw_thr_writer(void *_count);
 384 int test_hash_rw_populate_hash(void);
 385
 386 /* unique test */
 387 void test_hash_unique_sigusr1_handler(int signo);
 388 void test_hash_unique_sigusr2_handler(int signo);
 389 void *test_hash_unique_thr_reader(void *_count);
 390 void *test_hash_unique_thr_writer(void *_count);
 391 int test_hash_unique_populate_hash(void);
 392
 393 #endif /* _TEST_URCU_HASH_H */