adding --randomize

Author: oranagra

client.cpp

@@ -132,10 +132,15 @@ bool client::setup_client(benchmark_config *config, abstract_protocol *protocol,
 
     m_obj_gen = objgen->clone();
     assert(m_obj_gen != NULL);
-    if (config->distinct_client_seed)
+
+    if (config->distinct_client_seed && config->randomize)
+        m_obj_gen->set_random_seed(config->randomize + config->next_client_idx);
+    else if (config->randomize)
+        m_obj_gen->set_random_seed(config->randomize);
+    else if (config->distinct_client_seed)
         m_obj_gen->set_random_seed(config->next_client_idx);
-    if (config->key_pattern[0]=='P')
-    {
+
+    if (config->key_pattern[0]=='P') {
         int range = (config->key_maximum - config->key_minimum)/(config->clients*config->threads) + 1;
         int min = config->key_minimum + range*config->next_client_idx;
         int max = min+range;

memtier_benchmark.cpp

@@ -219,6 +219,7 @@ static int config_parse_args(int argc, char *argv[], struct benchmark_config *cf
         o_show_config,
         o_hide_histogram,
         o_distinct_client_seed,
+        o_randomize,
         o_client_stats,
         o_reconnect_interval,
         o_generate_keys,
@@ -239,6 +240,7 @@ static int config_parse_args(int argc, char *argv[], struct benchmark_config *cf
         { "show-config",                0, 0, o_show_config },
         { "hide-histogram",             0, 0, o_hide_histogram },
         { "distinct-client-seed",       0, 0, o_distinct_client_seed },
+        { "randomize",                  0, 0, o_randomize },
         { "requests",                   1, 0, 'n' },
         { "clients",                    1, 0, 'c' },
         { "threads",                    1, 0, 't' },        
@@ -338,6 +340,9 @@ static int config_parse_args(int argc, char *argv[], struct benchmark_config *cf
                 case o_distinct_client_seed:
                     cfg->distinct_client_seed++;
                     break;
+                case o_randomize:
+                    cfg->randomize = (int)time(NULL);
+                    break;
                 case 'n':
                     endptr = NULL;
                     if (strcmp(optarg, "allkeys")==0)
@@ -572,6 +577,7 @@ void usage() {
             "                                 on the protocol can be PASSWORD or USER:PASSWORD.\n"
             "      --select-db=DB             DB number to select, when testing a redis server\n"
             "      --distinct-client-seed     Use a different random seed for each client\n"
+            "      --randomize                random seed based on timestamp (defalut is constant value)\n"
             "\n"
             "Object Options:\n"
             "  -d  --data-size=SIZE           Object data size (default: 32)\n"

memtier_benchmark.h

@@ -43,6 +43,7 @@ struct benchmark_config {
     int show_config;
     int hide_histogram;
     int distinct_client_seed;
+    int randomize;
     int next_client_idx;
     unsigned int requests;
     unsigned int clients;