add unique_checks option to db-benchmark-test to show the excessive splitting...

add unique_checks option to db-benchmark-test to show the excessive splitting and merging bug. addresses #1828

git-svn-id: file:///svn/toku/tokudb@12938 c7de825b-a66e-492c-adef-691d508d4ae1

db-benchmark-test/db-benchmark-test.c

@@ -472,6 +472,13 @@ int main (int argc, const char *argv[]) {
                 env_open_flags |= DB_INIT_LOCK;
             else
                 env_open_flags &= ~DB_INIT_LOCK;
+        } else if (strcmp(arg, "--unique_checks") == 0) {
+            if (i+1 >= argc) return print_usage(argv[0]);
+            int unique_checks = atoi(argv[++i]);
+            if (unique_checks)
+                put_flags = DB_NOOVERWRITE;
+            else
+                put_flags = DB_YESOVERWRITE;
         } else {
 	    return print_usage(argv[0]);
 	}