git.m6w6.name Git - m6w6/libmemcached/blob - contrib/bin/memaslap/ms_thread.c

   1 /*
   2     +--------------------------------------------------------------------+
   3     | libmemcached - C/C++ Client Library for memcached                  |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted under the terms of the BSD license.    |
   7     | You should have received a copy of the license in a bundled file   |
   8     | named LICENSE; in case you did not receive a copy you can review   |
   9     | the terms online at: https://opensource.org/licenses/BSD-3-Clause  |
  10     +--------------------------------------------------------------------+
  11     | Copyright (c) 2006-2014 Brian Aker   https://datadifferential.com/ |
  12     | Copyright (c) 2020 Michael Wallner   <mike@php.net>                |
  13     +--------------------------------------------------------------------+
  14 */
  15
  16 #include "mem_config.h"
  17
  18 #if defined(HAVE_SYS_TIME_H)
  19 #  include <sys/time.h>
  20 #endif
  21 #include <time.h>
  22
  23 #include "ms_thread.h"
  24 #include "ms_setting.h"
  25 #include "ms_atomic.h"
  26
  27 /* global variable */
  28 pthread_key_t ms_thread_key;
  29
  30 /* array of thread context structure, each thread has a thread context structure */
  31 static ms_thread_ctx_t *ms_thread_ctx;
  32
  33 /* functions */
  34 static void ms_set_current_time(void);
  35 static void ms_check_sock_timeout(void);
  36 static void ms_clock_handler(const int fd, const short which, void *arg);
  37 static uint32_t ms_set_thread_cpu_affinity(uint32_t cpu);
  38 static int ms_setup_thread(ms_thread_ctx_t *thread_ctx);
  39 static void *ms_worker_libevent(void *arg);
  40 static void ms_create_worker(void *(*func)(void *), ms_thread_ctx_t *arg);
  41
  42 /**
  43  *  time-sensitive callers can call it by hand with this,
  44  *  outside the normal ever-1-second timer
  45  */
  46 static void ms_set_current_time() {
  47   struct timeval timer;
  48   ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
  49
  50   gettimeofday(&timer, NULL);
  51   ms_thread->curr_time = (rel_time_t) timer.tv_sec;
  52 } /* ms_set_current_time */
  53
  54 /**
  55  *  used to check whether UDP of command are waiting timeout
  56  *  by the ever-1-second timer
  57  */
  58 static void ms_check_sock_timeout(void) {
  59   ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
  60   ms_conn_t *c = NULL;
  61   int time_diff = 0;
  62
  63   for (uint32_t i = 0; i < ms_thread->thread_ctx->nconns; i++) {
  64     c = &ms_thread->conn[i];
  65
  66     if (c->udp) {
  67       time_diff = (int) (ms_thread->curr_time - (rel_time_t) c->start_time.tv_sec);
  68
  69       /* wait time out */
  70       if (time_diff > SOCK_WAIT_TIMEOUT) {
  71         /* calculate dropped packets count */
  72         if (c->recvpkt > 0) {
  73           atomic_add_size(&ms_stats.pkt_drop, c->packets - c->recvpkt);
  74         }
  75
  76         atomic_add_size(&ms_stats.udp_timeout, 1);
  77         ms_reset_conn(c, true);
  78       }
  79     }
  80   }
  81 } /* ms_check_sock_timeout */
  82
  83 /* if disconnect, the ever-1-second timer will call this function to reconnect */
  84 static void ms_reconn_thread_socks(void) {
  85   ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
  86   for (uint32_t i = 0; i < ms_thread->thread_ctx->nconns; i++) {
  87     ms_reconn_socks(&ms_thread->conn[i]);
  88   }
  89 } /* ms_reconn_thread_socks */
  90
  91 /**
  92  * the handler of the ever-1-second timer
  93  *
  94  * @param fd, the descriptors of the socket
  95  * @param which, event flags
  96  * @param arg, argument
  97  */
  98 static void ms_clock_handler(const int fd, const short which, void *arg) {
  99   ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
 100   struct timeval t = {.tv_sec = 1, .tv_usec = 0};
 101
 102   UNUSED_ARGUMENT(fd);
 103   UNUSED_ARGUMENT(which);
 104   UNUSED_ARGUMENT(arg);
 105
 106   ms_set_current_time();
 107
 108   if (ms_thread->initialized) {
 109     /* only delete the event if it's actually there. */
 110     evtimer_del(&ms_thread->clock_event);
 111     ms_check_sock_timeout();
 112   } else {
 113     ms_thread->initialized = true;
 114   }
 115
 116   ms_reconn_thread_socks();
 117
 118   evtimer_set(&ms_thread->clock_event, ms_clock_handler, 0);
 119   event_base_set(ms_thread->base, &ms_thread->clock_event);
 120   evtimer_add(&ms_thread->clock_event, &t);
 121 } /* ms_clock_handler */
 122
 123 /**
 124  * used to bind thread to CPU if the system supports
 125  *
 126  * @param cpu, cpu index
 127  *
 128  * @return if success, return EXIT_SUCCESS, else return -1
 129  */
 130 static uint32_t ms_set_thread_cpu_affinity(uint32_t cpu) {
 131   uint32_t ret = 0;
 132
 133 #ifdef HAVE_CPU_SET_T
 134   cpu_set_t cpu_set;
 135   CPU_ZERO(&cpu_set);
 136   CPU_SET(cpu, &cpu_set);
 137
 138   if (sched_setaffinity(0, sizeof(cpu_set_t), &cpu_set) == -1) {
 139     fprintf(stderr, "WARNING: Could not set CPU Affinity, continuing...\n");
 140     ret = 1;
 141   }
 142 #else
 143   UNUSED_ARGUMENT(cpu);
 144 #endif
 145
 146   return ret;
 147 } /* ms_set_thread_cpu_affinity */
 148
 149 /**
 150  * Set up a thread's information.
 151  *
 152  * @param thread_ctx, pointer of the thread context structure
 153  *
 154  * @return if success, return EXIT_SUCCESS, else return -1
 155  */
 156 static int ms_setup_thread(ms_thread_ctx_t *thread_ctx) {
 157   ms_thread_t *ms_thread = (ms_thread_t *) calloc(sizeof(*ms_thread), 1);
 158   pthread_setspecific(ms_thread_key, (void *) ms_thread);
 159
 160   ms_thread->thread_ctx = thread_ctx;
 161   ms_thread->nactive_conn = thread_ctx->nconns;
 162   ms_thread->initialized = false;
 163   static ATOMIC uint32_t cnt = 0;
 164
 165   gettimeofday(&ms_thread->startup_time, NULL);
 166
 167   ms_thread->base = event_base_new();
 168   if (ms_thread->base == NULL) {
 169     if (atomic_add_32_nv(&cnt, 1) == 0) {
 170       fprintf(stderr, "Can't allocate event base.\n");
 171     }
 172
 173     return -1;
 174   }
 175
 176   ms_thread->conn = (ms_conn_t *) malloc((size_t) thread_ctx->nconns * sizeof(ms_conn_t));
 177   if (ms_thread->conn == NULL) {
 178     if (atomic_add_32_nv(&cnt, 1) == 0) {
 179       fprintf(stderr, "Can't allocate concurrency structure for thread descriptors.");
 180     }
 181
 182     return -1;
 183   }
 184   memset(ms_thread->conn, 0, (size_t) thread_ctx->nconns * sizeof(ms_conn_t));
 185
 186   for (uint32_t i = 0; i < thread_ctx->nconns; i++) {
 187     ms_thread->conn[i].conn_idx = i;
 188     if (ms_setup_conn(&ms_thread->conn[i])) {
 189       /* only output this error once */
 190       if (atomic_add_32_nv(&cnt, 1) == 0) {
 191         fprintf(stderr, "Initializing connection failed.\n");
 192       }
 193
 194       return -1;
 195     }
 196   }
 197
 198   return EXIT_SUCCESS;
 199 } /* ms_setup_thread */
 200
 201 /**
 202  * Worker thread: main event loop
 203  *
 204  * @param arg, the pointer of argument
 205  *
 206  * @return void*
 207  */
 208 static void *ms_worker_libevent(void *arg) {
 209   ms_thread_t *ms_thread = NULL;
 210   ms_thread_ctx_t *thread_ctx = (ms_thread_ctx_t *) arg;
 211
 212   /**
 213    * If system has more than one cpu and supports set cpu
 214    * affinity, try to bind each thread to a cpu core;
 215    */
 216   if (ms_setting.ncpu > 1) {
 217     ms_set_thread_cpu_affinity(thread_ctx->thd_idx % ms_setting.ncpu);
 218   }
 219
 220   if (ms_setup_thread(thread_ctx)) {
 221     exit(1);
 222   }
 223
 224   /* each thread with a timer */
 225   ms_clock_handler(0, 0, 0);
 226
 227   pthread_mutex_lock(&ms_global.init_lock.lock);
 228   ms_global.init_lock.count++;
 229   pthread_cond_signal(&ms_global.init_lock.cond);
 230   pthread_mutex_unlock(&ms_global.init_lock.lock);
 231
 232   ms_thread = pthread_getspecific(ms_thread_key);
 233   event_base_loop(ms_thread->base, 0);
 234   event_base_free(ms_thread->base);
 235   free(ms_thread);
 236
 237   return NULL;
 238 } /* ms_worker_libevent */
 239
 240 /**
 241  * Creates a worker thread.
 242  *
 243  * @param func, the callback function
 244  * @param arg, the argument to pass to the callback function
 245  */
 246 static void ms_create_worker(void *(*func)(void *), ms_thread_ctx_t *arg) {
 247   pthread_attr_t attr;
 248   int ret;
 249
 250   pthread_attr_init(&attr);
 251
 252   if ((ret = pthread_create(&arg->pth_id, &attr, func, arg))) {
 253     fprintf(stderr, "Can't create thread: %s.\n", strerror(ret));
 254     exit(1);
 255   }
 256 } /* ms_create_worker */
 257
 258 /* initialize threads */
 259 void ms_thread_init() {
 260   ms_thread_ctx =
 261       (ms_thread_ctx_t *) malloc(sizeof(ms_thread_ctx_t) * (size_t) ms_setting.nthreads);
 262   if (ms_thread_ctx == NULL) {
 263     fprintf(stderr, "Can't allocate thread descriptors.");
 264     exit(1);
 265   }
 266
 267   for (uint32_t i = 0; i < ms_setting.nthreads; i++) {
 268     ms_thread_ctx[i].thd_idx = i;
 269     ms_thread_ctx[i].nconns = ms_setting.nconns / ms_setting.nthreads;
 270
 271     /**
 272      *  If only one server, all the connections in all threads
 273      *  connects the same server. For support multi-servers, simple
 274      *  distribute thread to server.
 275      */
 276     ms_thread_ctx[i].srv_idx = i % ms_setting.srv_cnt;
 277     ms_thread_ctx[i].tps_perconn = ms_setting.expected_tps / (int) ms_setting.nconns;
 278     ms_thread_ctx[i].exec_num_perconn = ms_setting.exec_num / ms_setting.nconns;
 279   }
 280
 281   if (pthread_key_create(&ms_thread_key, NULL)) {
 282     fprintf(stderr, "Can't create pthread keys. Major malfunction!\n");
 283     exit(1);
 284   }
 285   /* Create threads after we've done all the epoll setup. */
 286   for (uint32_t i = 0; i < ms_setting.nthreads; i++) {
 287     ms_create_worker(ms_worker_libevent, &ms_thread_ctx[i]);
 288   }
 289 } /* ms_thread_init */
 290
 291 /* cleanup some resource of threads when all the threads exit */
 292 void ms_thread_cleanup() {
 293   for (uint32_t i = 0; i < ms_setting.nthreads; i++) {
 294     pthread_join(ms_thread_ctx[i].pth_id, NULL);
 295   }
 296   if (ms_thread_ctx) {
 297     free(ms_thread_ctx);
 298   }
 299   pthread_key_delete(ms_thread_key);
 300 } /* ms_thread_cleanup */