Use less memory when emitting the protocol, by using more shared objects for commonly...

[redis.git] / src / redis.c

diff --git a/src/redis.c b/src/redis.c
index 091461159e165c8c8be49663f0a8f6e6872bdb91..45ee07caf64cd348b727802d87330502ee177b13 100644 (file)
--- a/src/redis.c
+++ b/src/redis.c
@@ -31,11 +31,6 @@
 #include "slowlog.h"
 #include "bio.h"
 
 #include "slowlog.h"
 #include "bio.h"
 

-#ifdef HAVE_BACKTRACE
-#include <execinfo.h>
-#include <ucontext.h>
-#endif /* HAVE_BACKTRACE */
-

 #include <time.h>
 #include <signal.h>
 #include <sys/wait.h>
 #include <time.h>
 #include <signal.h>
 #include <sys/wait.h>


@@ -107,7 +102,10 @@ struct redisCommand *commandTable;
  * s: command not allowed in scripts.
  * R: random command. Command is not deterministic, that is, the same command
  *    with the same arguments, with the same key space, may have different
  * s: command not allowed in scripts.
  * R: random command. Command is not deterministic, that is, the same command
  *    with the same arguments, with the same key space, may have different

- *    results. For instance SPOP and RANDOMKEY are two random commands. */
+ *    results. For instance SPOP and RANDOMKEY are two random commands.
+ * S: Sort command output array if called from script, so that the output
+ *    is deterministic.
+ */

 struct redisCommand redisCommandTable[] = {
     {"get",getCommand,2,"r",0,NULL,1,1,1,0,0},
     {"set",setCommand,3,"wm",0,noPreloadGetKeys,1,1,1,0,0},
 struct redisCommand redisCommandTable[] = {
     {"get",getCommand,2,"r",0,NULL,1,1,1,0,0},
     {"set",setCommand,3,"wm",0,noPreloadGetKeys,1,1,1,0,0},


@@ -150,13 +148,13 @@ struct redisCommand redisCommandTable[] = {
     {"scard",scardCommand,2,"r",0,NULL,1,1,1,0,0},
     {"spop",spopCommand,2,"wRs",0,NULL,1,1,1,0,0},
     {"srandmember",srandmemberCommand,2,"rR",0,NULL,1,1,1,0,0},
     {"scard",scardCommand,2,"r",0,NULL,1,1,1,0,0},
     {"spop",spopCommand,2,"wRs",0,NULL,1,1,1,0,0},
     {"srandmember",srandmemberCommand,2,"rR",0,NULL,1,1,1,0,0},

-    {"sinter",sinterCommand,-2,"r",0,NULL,1,-1,1,0,0},
+    {"sinter",sinterCommand,-2,"rS",0,NULL,1,-1,1,0,0},

     {"sinterstore",sinterstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
     {"sinterstore",sinterstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},

-    {"sunion",sunionCommand,-2,"r",0,NULL,1,-1,1,0,0},
+    {"sunion",sunionCommand,-2,"rS",0,NULL,1,-1,1,0,0},

     {"sunionstore",sunionstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
     {"sunionstore",sunionstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},

-    {"sdiff",sdiffCommand,-2,"r",0,NULL,1,-1,1,0,0},
+    {"sdiff",sdiffCommand,-2,"rS",0,NULL,1,-1,1,0,0},

     {"sdiffstore",sdiffstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},
     {"sdiffstore",sdiffstoreCommand,-3,"wm",0,NULL,1,-1,1,0,0},

-    {"smembers",sinterCommand,2,"r",0,NULL,1,1,1,0,0},
+    {"smembers",sinterCommand,2,"rS",0,NULL,1,1,1,0,0},

     {"zadd",zaddCommand,-4,"wm",0,NULL,1,1,1,0,0},
     {"zincrby",zincrbyCommand,4,"wm",0,NULL,1,1,1,0,0},
     {"zrem",zremCommand,-3,"w",0,NULL,1,1,1,0,0},
     {"zadd",zaddCommand,-4,"wm",0,NULL,1,1,1,0,0},
     {"zincrby",zincrbyCommand,4,"wm",0,NULL,1,1,1,0,0},
     {"zrem",zremCommand,-3,"w",0,NULL,1,1,1,0,0},


@@ -182,8 +180,8 @@ struct redisCommand redisCommandTable[] = {
     {"hincrbyfloat",hincrbyfloatCommand,4,"wm",0,NULL,1,1,1,0,0},
     {"hdel",hdelCommand,-3,"w",0,NULL,1,1,1,0,0},
     {"hlen",hlenCommand,2,"r",0,NULL,1,1,1,0,0},
     {"hincrbyfloat",hincrbyfloatCommand,4,"wm",0,NULL,1,1,1,0,0},
     {"hdel",hdelCommand,-3,"w",0,NULL,1,1,1,0,0},
     {"hlen",hlenCommand,2,"r",0,NULL,1,1,1,0,0},

-    {"hkeys",hkeysCommand,2,"r",0,NULL,1,1,1,0,0},
-    {"hvals",hvalsCommand,2,"r",0,NULL,1,1,1,0,0},
+    {"hkeys",hkeysCommand,2,"rS",0,NULL,1,1,1,0,0},
+    {"hvals",hvalsCommand,2,"rS",0,NULL,1,1,1,0,0},

     {"hgetall",hgetallCommand,2,"r",0,NULL,1,1,1,0,0},
     {"hexists",hexistsCommand,3,"r",0,NULL,1,1,1,0,0},
     {"incrby",incrbyCommand,3,"wm",0,NULL,1,1,1,0,0},
     {"hgetall",hgetallCommand,2,"r",0,NULL,1,1,1,0,0},
     {"hexists",hexistsCommand,3,"r",0,NULL,1,1,1,0,0},
     {"incrby",incrbyCommand,3,"wm",0,NULL,1,1,1,0,0},


@@ -201,7 +199,7 @@ struct redisCommand redisCommandTable[] = {
     {"expireat",expireatCommand,3,"w",0,NULL,1,1,1,0,0},
     {"pexpire",pexpireCommand,3,"w",0,NULL,1,1,1,0,0},
     {"pexpireat",pexpireatCommand,3,"w",0,NULL,1,1,1,0,0},
     {"expireat",expireatCommand,3,"w",0,NULL,1,1,1,0,0},
     {"pexpire",pexpireCommand,3,"w",0,NULL,1,1,1,0,0},
     {"pexpireat",pexpireatCommand,3,"w",0,NULL,1,1,1,0,0},

-    {"keys",keysCommand,2,"r",0,NULL,0,0,0,0,0},
+    {"keys",keysCommand,2,"rS",0,NULL,0,0,0,0,0},

     {"dbsize",dbsizeCommand,1,"r",0,NULL,0,0,0,0,0},
     {"auth",authCommand,2,"rs",0,NULL,0,0,0,0,0},
     {"ping",pingCommand,1,"r",0,NULL,0,0,0,0,0},
     {"dbsize",dbsizeCommand,1,"r",0,NULL,0,0,0,0,0},
     {"auth",authCommand,2,"rs",0,NULL,0,0,0,0,0},
     {"ping",pingCommand,1,"r",0,NULL,0,0,0,0,0},


@@ -218,7 +216,7 @@ struct redisCommand redisCommandTable[] = {
     {"sync",syncCommand,1,"ars",0,NULL,0,0,0,0,0},
     {"flushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},
     {"flushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},
     {"sync",syncCommand,1,"ars",0,NULL,0,0,0,0,0},
     {"flushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},
     {"flushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},

-    {"sort",sortCommand,-2,"wm",0,NULL,1,1,1,0,0},
+    {"sort",sortCommand,-2,"wmS",0,NULL,1,1,1,0,0},

     {"info",infoCommand,-1,"r",0,NULL,0,0,0,0,0},
     {"monitor",monitorCommand,1,"ars",0,NULL,0,0,0,0,0},
     {"ttl",ttlCommand,2,"r",0,NULL,1,1,1,0,0},
     {"info",infoCommand,-1,"r",0,NULL,0,0,0,0,0},
     {"monitor",monitorCommand,1,"ars",0,NULL,0,0,0,0,0},
     {"ttl",ttlCommand,2,"r",0,NULL,1,1,1,0,0},


@@ -759,6 +757,9 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
      * in order to guarantee a strict consistency. */
     if (server.masterhost == NULL) activeExpireCycle();
 
      * in order to guarantee a strict consistency. */
     if (server.masterhost == NULL) activeExpireCycle();
 

+    /* Close clients that need to be closed asynchronous */
+    freeClientsInAsyncFreeQueue();
+

     /* Replication cron function -- used to reconnect to master and
      * to detect transfer failures. */
     if (!(loops % 10)) replicationCron();
     /* Replication cron function -- used to reconnect to master and
      * to detect transfer failures. */
     if (!(loops % 10)) replicationCron();


@@ -787,8 +788,11 @@ void beforeSleep(struct aeEventLoop *eventLoop) {
         c->flags &= ~REDIS_UNBLOCKED;
 
         /* Process remaining data in the input buffer. */
         c->flags &= ~REDIS_UNBLOCKED;
 
         /* Process remaining data in the input buffer. */

-        if (c->querybuf && sdslen(c->querybuf) > 0)
+        if (c->querybuf && sdslen(c->querybuf) > 0) {
+            server.current_client = c;

             processInputBuffer(c);
             processInputBuffer(c);

+            server.current_client = NULL;
+        }

     }
 
     /* Write the AOF buffer on disk */
     }
 
     /* Write the AOF buffer on disk */


@@ -847,15 +851,21 @@ void createSharedObjects(void) {
     shared.unsubscribebulk = createStringObject("$11\r\nunsubscribe\r\n",18);
     shared.psubscribebulk = createStringObject("$10\r\npsubscribe\r\n",17);
     shared.punsubscribebulk = createStringObject("$12\r\npunsubscribe\r\n",19);
     shared.unsubscribebulk = createStringObject("$11\r\nunsubscribe\r\n",18);
     shared.psubscribebulk = createStringObject("$10\r\npsubscribe\r\n",17);
     shared.punsubscribebulk = createStringObject("$12\r\npunsubscribe\r\n",19);

-    shared.mbulk3 = createStringObject("*3\r\n",4);
-    shared.mbulk4 = createStringObject("*4\r\n",4);
+    shared.del = createStringObject("DEL",3);

     for (j = 0; j < REDIS_SHARED_INTEGERS; j++) {
         shared.integers[j] = createObject(REDIS_STRING,(void*)(long)j);
         shared.integers[j]->encoding = REDIS_ENCODING_INT;
     }
     for (j = 0; j < REDIS_SHARED_INTEGERS; j++) {
         shared.integers[j] = createObject(REDIS_STRING,(void*)(long)j);
         shared.integers[j]->encoding = REDIS_ENCODING_INT;
     }

+    for (j = 0; j < REDIS_SHARED_BULKHDR_LEN; j++) {
+        shared.mbulkhdr[j] = createObject(REDIS_STRING,
+            sdscatprintf(sdsempty(),"*%d\r\n",j));
+        shared.bulkhdr[j] = createObject(REDIS_STRING,
+            sdscatprintf(sdsempty(),"$%d\r\n",j));
+    }

 }
 
 void initServerConfig() {
 }
 
 void initServerConfig() {

+    server.arch_bits = (sizeof(long) == 8) ? 64 : 32;

     server.port = REDIS_SERVERPORT;
     server.bindaddr = NULL;
     server.unixsocket = NULL;
     server.port = REDIS_SERVERPORT;
     server.bindaddr = NULL;
     server.unixsocket = NULL;


@@ -928,6 +938,17 @@ void initServerConfig() {
     server.repl_serve_stale_data = 1;
     server.repl_down_since = -1;
 
     server.repl_serve_stale_data = 1;
     server.repl_down_since = -1;
 

+    /* Client output buffer limits */
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_NORMAL].hard_limit_bytes = 0;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_NORMAL].soft_limit_bytes = 0;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_NORMAL].soft_limit_seconds = 0;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_SLAVE].hard_limit_bytes = 1024*1024*256;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_SLAVE].soft_limit_bytes = 1024*1024*64;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_SLAVE].soft_limit_seconds = 60;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_PUBSUB].hard_limit_bytes = 1024*1024*32;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_PUBSUB].soft_limit_bytes = 1024*1024*8;
+    server.client_obuf_limits[REDIS_CLIENT_LIMIT_CLASS_PUBSUB].soft_limit_seconds = 60;
+

     /* Double constants initialization */
     R_Zero = 0.0;
     R_PosInf = 1.0/R_Zero;
     /* Double constants initialization */
     R_Zero = 0.0;
     R_PosInf = 1.0/R_Zero;


@@ -1002,7 +1023,9 @@ void initServer() {
             server.syslog_facility);
     }
 
             server.syslog_facility);
     }
 

+    server.current_client = NULL;

     server.clients = listCreate();
     server.clients = listCreate();

+    server.clients_to_close = listCreate();

     server.slaves = listCreate();
     server.monitors = listCreate();
     server.unblocked_clients = listCreate();
     server.slaves = listCreate();
     server.monitors = listCreate();
     server.unblocked_clients = listCreate();


@@ -1077,12 +1100,20 @@ void initServer() {
         }
     }
 
         }
     }
 

+    /* 32 bit instances are limited to 4GB of address space, so if there is
+     * no explicit limit in the user provided configuration we set a limit
+     * at 3.5GB using maxmemory with 'noeviction' policy'. This saves
+     * useless crashes of the Redis instance. */
+    if (server.arch_bits == 32 && server.maxmemory == 0) {
+        redisLog(REDIS_WARNING,"Warning: 32 bit instance detected but no memory limit set. Setting 3.5 GB maxmemory limit with 'noeviction' policy now.");
+        server.maxmemory = 3584LL*(1024*1024); /* 3584 MB = 3.5 GB */
+        server.maxmemory_policy = REDIS_MAXMEMORY_NO_EVICTION;
+    }
+

     if (server.cluster_enabled) clusterInit();
     scriptingInit();
     slowlogInit();
     bioInit();
     if (server.cluster_enabled) clusterInit();
     scriptingInit();
     slowlogInit();
     bioInit();

-    srand(time(NULL)^getpid());
-

 }
 
 /* Populates the Redis Command Table starting from the hard coded list
 }
 
 /* Populates the Redis Command Table starting from the hard coded list


@@ -1106,6 +1137,7 @@ void populateCommandTable(void) {
             case 'f': c->flags |= REDIS_CMD_FORCE_REPLICATION; break;
             case 's': c->flags |= REDIS_CMD_NOSCRIPT; break;
             case 'R': c->flags |= REDIS_CMD_RANDOM; break;
             case 'f': c->flags |= REDIS_CMD_FORCE_REPLICATION; break;
             case 's': c->flags |= REDIS_CMD_NOSCRIPT; break;
             case 'R': c->flags |= REDIS_CMD_RANDOM; break;

+            case 'S': c->flags |= REDIS_CMD_SORT_FOR_SCRIPT; break;

             default: redisPanic("Unsupported command flag"); break;
             }
             f++;
             default: redisPanic("Unsupported command flag"); break;
             }
             f++;


@@ -1144,24 +1176,34 @@ struct redisCommand *lookupCommandByCString(char *s) {
 }
 
 /* Call() is the core of Redis execution of a command */
 }
 
 /* Call() is the core of Redis execution of a command */

-void call(redisClient *c) {
+void call(redisClient *c, int flags) {

     long long dirty, start = ustime(), duration;
 
     dirty = server.dirty;
     c->cmd->proc(c);
     dirty = server.dirty-dirty;
     duration = ustime()-start;
     long long dirty, start = ustime(), duration;
 
     dirty = server.dirty;
     c->cmd->proc(c);
     dirty = server.dirty-dirty;
     duration = ustime()-start;

-    c->cmd->microseconds += duration;
-    slowlogPushEntryIfNeeded(c->argv,c->argc,duration);
-    c->cmd->calls++;
-
-    if (server.aof_state != REDIS_AOF_OFF && dirty > 0)
-        feedAppendOnlyFile(c->cmd,c->db->id,c->argv,c->argc);
-    if ((dirty > 0 || c->cmd->flags & REDIS_CMD_FORCE_REPLICATION) &&
-        listLength(server.slaves))
-        replicationFeedSlaves(server.slaves,c->db->id,c->argv,c->argc);
-    if (listLength(server.monitors))
-        replicationFeedMonitors(server.monitors,c->db->id,c->argv,c->argc);
+
+    /* When EVAL is called loading the AOF we don't want commands called
+     * from Lua to go into the slowlog or to populate statistics. */
+    if (server.loading && c->flags & REDIS_LUA_CLIENT)
+        flags &= ~(REDIS_CALL_SLOWLOG | REDIS_CALL_STATS);
+
+    if (flags & REDIS_CALL_SLOWLOG)
+        slowlogPushEntryIfNeeded(c->argv,c->argc,duration);
+    if (flags & REDIS_CALL_STATS) {
+        c->cmd->microseconds += duration;
+        c->cmd->calls++;
+    }
+    if (flags & REDIS_CALL_PROPAGATE) {
+        if (server.aof_state != REDIS_AOF_OFF && dirty > 0)
+            feedAppendOnlyFile(c->cmd,c->db->id,c->argv,c->argc);
+        if ((dirty > 0 || c->cmd->flags & REDIS_CMD_FORCE_REPLICATION) &&
+            listLength(server.slaves))
+            replicationFeedSlaves(server.slaves,c->db->id,c->argv,c->argc);
+        if (listLength(server.monitors))
+            replicationFeedMonitors(server.monitors,c->db->id,c->argv,c->argc);
+    }

     server.stat_numcommands++;
 }
 
     server.stat_numcommands++;
 }
 


@@ -1290,7 +1332,7 @@ int processCommand(redisClient *c) {
         queueMultiCommand(c);
         addReply(c,shared.queued);
     } else {
         queueMultiCommand(c);
         addReply(c,shared.queued);
     } else {

-        call(c);
+        call(c,REDIS_CALL_FULL);

     }
     return REDIS_OK;
 }
     }
     return REDIS_OK;
 }


@@ -1423,8 +1465,9 @@ sds genRedisInfoString(char *section) {
             "redis_version:%s\r\n"
             "redis_git_sha1:%s\r\n"
             "redis_git_dirty:%d\r\n"
             "redis_version:%s\r\n"
             "redis_git_sha1:%s\r\n"
             "redis_git_dirty:%d\r\n"

-            "arch_bits:%s\r\n"
+            "arch_bits:%d\r\n"

             "multiplexing_api:%s\r\n"
             "multiplexing_api:%s\r\n"

+            "gcc_version:%d.%d.%d\r\n"

             "process_id:%ld\r\n"
             "tcp_port:%d\r\n"
             "uptime_in_seconds:%ld\r\n"
             "process_id:%ld\r\n"
             "tcp_port:%d\r\n"
             "uptime_in_seconds:%ld\r\n"


@@ -1433,8 +1476,13 @@ sds genRedisInfoString(char *section) {
             REDIS_VERSION,
             redisGitSHA1(),
             strtol(redisGitDirty(),NULL,10) > 0,
             REDIS_VERSION,
             redisGitSHA1(),
             strtol(redisGitDirty(),NULL,10) > 0,

-            (sizeof(long) == 8) ? "64" : "32",
+            server.arch_bits,

             aeGetApiName(),
             aeGetApiName(),

+#ifdef __GNUC__
+            __GNUC__,__GNUC_MINOR__,__GNUC_PATCHLEVEL__,
+#else
+            0,0,0,
+#endif

             (long) getpid(),
             server.port,
             uptime,
             (long) getpid(),
             server.port,
             uptime,


@@ -1447,7 +1495,7 @@ sds genRedisInfoString(char *section) {
         if (sections++) info = sdscat(info,"\r\n");
         info = sdscatprintf(info,
             "# Clients\r\n"
         if (sections++) info = sdscat(info,"\r\n");
         info = sdscatprintf(info,
             "# Clients\r\n"

-            "connected_clients:%d\r\n"
+            "connected_clients:%lu\r\n"

             "client_longest_output_list:%lu\r\n"
             "client_biggest_input_buf:%lu\r\n"
             "blocked_clients:%d\r\n",
             "client_longest_output_list:%lu\r\n"
             "client_biggest_input_buf:%lu\r\n"
             "blocked_clients:%d\r\n",


@@ -1562,7 +1610,7 @@ sds genRedisInfoString(char *section) {
             "keyspace_hits:%lld\r\n"
             "keyspace_misses:%lld\r\n"
             "pubsub_channels:%ld\r\n"
             "keyspace_hits:%lld\r\n"
             "keyspace_misses:%lld\r\n"
             "pubsub_channels:%ld\r\n"

-            "pubsub_patterns:%u\r\n"
+            "pubsub_patterns:%lu\r\n"

             "latest_fork_usec:%lld\r\n",
             server.stat_numconnections,
             server.stat_numcommands,
             "latest_fork_usec:%lld\r\n",
             server.stat_numconnections,
             server.stat_numcommands,


@@ -1615,7 +1663,7 @@ sds genRedisInfoString(char *section) {
             }
         }
         info = sdscatprintf(info,
             }
         }
         info = sdscatprintf(info,

-            "connected_slaves:%d\r\n",
+            "connected_slaves:%lu\r\n",

             listLength(server.slaves));
         if (listLength(server.slaves)) {
             int slaveid = 0;
             listLength(server.slaves));
         if (listLength(server.slaves)) {
             int slaveid = 0;


@@ -1923,102 +1971,6 @@ void redisAsciiArt(void) {
     zfree(buf);
 }
 
     zfree(buf);
 }
 

-#ifdef HAVE_BACKTRACE
-static void *getMcontextEip(ucontext_t *uc) {
-#if defined(__FreeBSD__)
-    return (void*) uc->uc_mcontext.mc_eip;
-#elif defined(__dietlibc__)
-    return (void*) uc->uc_mcontext.eip;
-#elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
-  #if __x86_64__
-    return (void*) uc->uc_mcontext->__ss.__rip;
-  #elif __i386__
-    return (void*) uc->uc_mcontext->__ss.__eip;
-  #else
-    return (void*) uc->uc_mcontext->__ss.__srr0;
-  #endif
-#elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
-  #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
-    return (void*) uc->uc_mcontext->__ss.__rip;
-  #else
-    return (void*) uc->uc_mcontext->__ss.__eip;
-  #endif
-#elif defined(__i386__)
-    return (void*) uc->uc_mcontext.gregs[14]; /* Linux 32 */
-#elif defined(__X86_64__) || defined(__x86_64__)
-    return (void*) uc->uc_mcontext.gregs[16]; /* Linux 64 */
-#elif defined(__ia64__) /* Linux IA64 */
-    return (void*) uc->uc_mcontext.sc_ip;
-#else
-    return NULL;
-#endif
-}
-
-void bugReportStart(void) {
-    if (server.bug_report_start == 0) {
-        redisLog(REDIS_WARNING,
-            "=== REDIS BUG REPORT START: Cut & paste starting from here ===");
-        server.bug_report_start = 1;
-    }
-}
-
-static void sigsegvHandler(int sig, siginfo_t *info, void *secret) {
-    void *trace[100];
-    char **messages = NULL;
-    int i, trace_size = 0;
-    ucontext_t *uc = (ucontext_t*) secret;
-    sds infostring, clients;
-    struct sigaction act;
-    REDIS_NOTUSED(info);
-
-    bugReportStart();
-    redisLog(REDIS_WARNING,
-        "    Redis %s crashed by signal: %d", REDIS_VERSION, sig);
-    redisLog(REDIS_WARNING,
-        "    Failed assertion: %s (%s:%d)", server.assert_failed,
-                        server.assert_file, server.assert_line);
-
-    /* Generate the stack trace */
-    trace_size = backtrace(trace, 100);
-
-    /* overwrite sigaction with caller's address */
-    if (getMcontextEip(uc) != NULL) {
-        trace[1] = getMcontextEip(uc);
-    }
-    messages = backtrace_symbols(trace, trace_size);
-    redisLog(REDIS_WARNING, "--- STACK TRACE");
-    for (i=1; i<trace_size; ++i)
-        redisLog(REDIS_WARNING,"%s", messages[i]);
-
-    /* Log INFO and CLIENT LIST */
-    redisLog(REDIS_WARNING, "--- INFO OUTPUT");
-    infostring = genRedisInfoString("all");
-    redisLogRaw(REDIS_WARNING, infostring);
-    redisLog(REDIS_WARNING, "--- CLIENT LIST OUTPUT");
-    clients = getAllClientsInfoString();
-    redisLogRaw(REDIS_WARNING, clients);
-    /* Don't sdsfree() strings to avoid a crash. Memory may be corrupted. */
-
-    redisLog(REDIS_WARNING,
-"=== REDIS BUG REPORT END. Make sure to include from START to END. ===\n\n"
-"    Please report the crash opening an issue on github:\n\n"
-"        http://github.com/antirez/redis/issues\n\n"
-);
-    /* free(messages); Don't call free() with possibly corrupted memory. */
-    if (server.daemonize) unlink(server.pidfile);
-
-    /* Make sure we exit with the right signal at the end. So for instance
-     * the core will be dumped if enabled. */
-    sigemptyset (&act.sa_mask);
-    /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
-     * is used. Otherwise, sa_handler is used */
-    act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND;
-    act.sa_handler = SIG_DFL;
-    sigaction (sig, &act, NULL);
-    kill(getpid(),sig);
-}
-#endif /* HAVE_BACKTRACE */
-

 static void sigtermHandler(int sig) {
     REDIS_NOTUSED(sig);
 
 static void sigtermHandler(int sig) {
     REDIS_NOTUSED(sig);
 


@@ -2050,9 +2002,15 @@ void setupSignalHandlers(void) {
 
 int main(int argc, char **argv) {
     long long start;
 
 int main(int argc, char **argv) {
     long long start;

+    struct timeval tv;

 
 

+    /* We need to initialize our libraries, and the server configuration. */

     zmalloc_enable_thread_safeness();
     zmalloc_enable_thread_safeness();

+    srand(time(NULL)^getpid());
+    gettimeofday(&tv,NULL);
+    dictSetHashFunctionSeed(tv.tv_sec^tv.tv_usec^getpid());

     initServerConfig();
     initServerConfig();

+

     if (argc >= 2) {
         int j = 1; /* First option to parse in argv[] */
         sds options = sdsempty();
     if (argc >= 2) {
         int j = 1; /* First option to parse in argv[] */
         sds options = sdsempty();