diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index 343f3a7..1ad04ae 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -40,7 +40,7 @@
 		},
 		{
 			"ImportPath": "github.com/siddontang/goleveldb/leveldb",
-			"Rev": "c1f6d721561c48f467b26a277741e55fd224df1e"
+			"Rev": "614b6126cf79eee8be803e7e65a3ef24fc12e44a"
 		},
 		{
 			"ImportPath": "github.com/szferi/gomdb",
diff --git a/client/ledis-py/ledis/client.py b/client/ledis-py/ledis/client.py
index 2504e5d..93245b8 100644
--- a/client/ledis-py/ledis/client.py
+++ b/client/ledis-py/ledis/client.py
@@ -137,6 +137,7 @@ class Ledis(object):
             'PING': lambda r: nativestr(r) == 'PONG',
             'SET': lambda r: r and nativestr(r) == 'OK',
             'INFO': parse_info,
+            'TIME': lambda x: (int(x[0]), int(x[1])),
         }
 
 
@@ -1035,6 +1036,13 @@ class Ledis(object):
     def scriptflush(self):
         return self.execute_command('SCRIPT', 'FLUSH')
 
+    def time(self):
+        """
+        Returns the server time as a 2-item tuple of ints:
+        (seconds since epoch, microseconds into this second).
+        """
+        return self.execute_command('TIME')
+
 
 class Transaction(Ledis):
     def __init__(self, connection_pool, response_callbacks):
diff --git a/client/nodejs/ledis/lib/commands.js b/client/nodejs/ledis/lib/commands.js
index 8a24f6c..f9c4d6c 100644
--- a/client/nodejs/ledis/lib/commands.js
+++ b/client/nodejs/ledis/lib/commands.js
@@ -8,6 +8,8 @@ module.exports = [
     "info",
     "flushall",
     "flushdb",
+    "time",
+    "config",
 
 	"bget",
 	"bdelete",
diff --git a/client/openresty/ledis.lua b/client/openresty/ledis.lua
index 7834c2b..ddbb150 100644
--- a/client/openresty/ledis.lua
+++ b/client/openresty/ledis.lua
@@ -153,6 +153,8 @@ local commands = {
     "info",
     "flushall",
     "flushdb",
+    "time",
+    "config",
 
     -- [[transaction]]
     "begin",
diff --git a/cmd/ledis-benchmark/main.go b/cmd/ledis-benchmark/main.go
index f91c98c..9948f5b 100644
--- a/cmd/ledis-benchmark/main.go
+++ b/cmd/ledis-benchmark/main.go
@@ -17,6 +17,7 @@ var number = flag.Int("n", 1000, "request number")
 var clients = flag.Int("c", 50, "number of clients")
 var reverse = flag.Bool("rev", false, "enable zset rev benchmark")
 var round = flag.Int("r", 1, "benchmark round number")
+var del = flag.Bool("del", true, "enable del benchmark")
 
 var wg sync.WaitGroup
 
@@ -281,18 +282,27 @@ func main() {
 		benchSet()
 		benchGet()
 		benchRandGet()
-		benchDel()
+
+		if *del == true {
+			benchDel()
+		}
 
 		benchPushList()
 		benchRangeList10()
 		benchRangeList50()
 		benchRangeList100()
-		benchPopList()
+
+		if *del == true {
+			benchPopList()
+		}
 
 		benchHset()
 		benchHGet()
 		benchHRandGet()
-		benchHDel()
+
+		if *del == true {
+			benchHDel()
+		}
 
 		benchZAdd()
 		benchZIncr()
@@ -306,7 +316,9 @@ func main() {
 			benchZRevRangeByScore()
 		}
 
-		benchZDel()
+		if *del == true {
+			benchZDel()
+		}
 
 		println("")
 	}
diff --git a/cmd/ledis-cli/const.go b/cmd/ledis-cli/const.go
index 3bca898..f03b249 100644
--- a/cmd/ledis-cli/const.go
+++ b/cmd/ledis-cli/const.go
@@ -1,4 +1,4 @@
-//This file was generated by .tools/generate_commands.py on Thu Oct 02 2014 15:24:07 +0800 
+//This file was generated by .tools/generate_commands.py on Wed Oct 08 2014 16:36:20 +0800 
 package main
 
 var helpCommands = [][]string{
@@ -16,6 +16,7 @@ var helpCommands = [][]string{
 	{"BTTL", "key", "Bitmap"},
 	{"BXSCAN", "key [MATCH match] [COUNT count]", "Bitmap"},
 	{"COMMIT", "-", "Transaction"},
+	{"CONFIG REWRITE", "-", "Server"},
 	{"DECR", "key", "KV"},
 	{"DECRBY", "key decrement", "KV"},
 	{"DEL", "key [key ...]", "KV"},
@@ -96,6 +97,7 @@ var helpCommands = [][]string{
 	{"SUNIONSTORE", "destination key [key ...]", "Set"},
 	{"SXSCAN", "key [MATCH match] [COUNT count]", "Set"},
 	{"SYNC", "logid", "Replication"},
+	{"TIME", "-", "Server"},
 	{"TTL", "key", "KV"},
 	{"XSCAN", "key [MATCH match] [COUNT count]", "KV"},
 	{"ZADD", "key score member [score member ...]", "ZSet"},
diff --git a/config/config.go b/config/config.go
index 668b545..a90e40c 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,11 +1,17 @@
 package config
 
 import (
+	"bytes"
+	"errors"
 	"github.com/BurntSushi/toml"
+	"github.com/siddontang/go/ioutil2"
+	"io"
 	"io/ioutil"
 )
 
-type Size int
+var (
+	ErrNoConfigFile = errors.New("Running without a config file")
+)
 
 const (
 	DefaultAddr     string = "127.0.0.1:6380"
@@ -39,6 +45,8 @@ type ReplicationConfig struct {
 }
 
 type Config struct {
+	FileName string `toml:"-"`
+
 	Addr string `toml:"addr"`
 
 	HttpAddr string `toml:"http_addr"`
@@ -67,7 +75,12 @@ func NewConfigWithFile(fileName string) (*Config, error) {
 		return nil, err
 	}
 
-	return NewConfigWithData(data)
+	if cfg, err := NewConfigWithData(data); err != nil {
+		return nil, err
+	} else {
+		cfg.FileName = fileName
+		return cfg, nil
+	}
 }
 
 func NewConfigWithData(data []byte) (*Config, error) {
@@ -123,3 +136,27 @@ func (cfg *LevelDBConfig) Adjust() {
 		cfg.MaxOpenFiles = 1024
 	}
 }
+
+func (cfg *Config) Dump(w io.Writer) error {
+	e := toml.NewEncoder(w)
+	e.Indent = ""
+	return e.Encode(cfg)
+}
+
+func (cfg *Config) DumpFile(fileName string) error {
+	var b bytes.Buffer
+
+	if err := cfg.Dump(&b); err != nil {
+		return err
+	}
+
+	return ioutil2.WriteFileAtomic(fileName, b.Bytes(), 0644)
+}
+
+func (cfg *Config) Rewrite() error {
+	if len(cfg.FileName) == 0 {
+		return ErrNoConfigFile
+	}
+
+	return cfg.DumpFile(cfg.FileName)
+}
diff --git a/config/config_test.go b/config/config_test.go
index 47779aa..6bde8bf 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -1,13 +1,42 @@
 package config
 
 import (
+	"os"
+	"reflect"
 	"testing"
 )
 
 func TestConfig(t *testing.T) {
-	_, err := NewConfigWithFile("./ledis.toml")
+	cfg, err := NewConfigWithFile("./config.toml")
 	if err != nil {
 		t.Fatal(err)
 	}
 
+	bakFile := "./config.toml.bak"
+
+	defer os.Remove(bakFile)
+	if err := cfg.DumpFile(bakFile); err != nil {
+		t.Fatal(err)
+	}
+
+	if c, err := NewConfigWithFile(bakFile); err != nil {
+		t.Fatal(err)
+	} else {
+		c.FileName = cfg.FileName
+		if !reflect.DeepEqual(cfg, c) {
+			t.Fatal("must equal")
+		}
+
+		c.FileName = bakFile
+		c.SlaveOf = "127.0.0.1:6381"
+		if err := c.Rewrite(); err != nil {
+			t.Fatal(err)
+		}
+
+		if c1, err := NewConfigWithFile(bakFile); err != nil {
+			t.Fatal(err)
+		} else if !reflect.DeepEqual(c, c1) {
+			t.Fatalf("must equal %v != %v", c, c1)
+		}
+	}
 }
diff --git a/doc/commands.json b/doc/commands.json
index b813d3b..8268ee8 100644
--- a/doc/commands.json
+++ b/doc/commands.json
@@ -628,6 +628,17 @@
         "arguments" : "-",
         "group": "Script",
         "readonly": false
-    }
+    },
 
+    "TIME": {
+        "arguments" : "-",
+        "group": "Server",
+        "readonly": true
+    },
+
+    "CONFIG REWRITE": {
+        "arguments" : "-",
+        "group": "Server",
+        "readonly": false
+    }
 }
diff --git a/doc/commands.md b/doc/commands.md
index 2cae8fd..c01b67c 100644
--- a/doc/commands.md
+++ b/doc/commands.md
@@ -132,6 +132,8 @@ Table of Contents
 	- [FLUSHALL](#flushall)
 	- [FLUSHDB](#flushdb)
 	- [INFO [section]](#info-section)
+	- [TIME](#time)
+	- [CONFIG REWRITE](#config-rewrite)
 - [Transaction](#transaction)
 	- [BEGIN](#begin)
 	- [ROLLBACK](#rollback)
@@ -2570,6 +2572,24 @@ The optional parameter can be used to select a specific section of information:
 
 When no parameter is provided, all will return.
 
+### TIME
+
+The TIME command returns the current server time as a two items lists: a Unix timestamp and the amount of microseconds already elapsed in the current second
+
+**Return value**
+
+array: two elements, one is unix time in seconds, the other is microseconds.
+
+### CONFIG REWRITE
+
+Rewrites the config file the server was started with. 
+
+**Unlike Redis rewrite, it will discard all comments in origin config file.**
+
+**Return value**
+
+String: OK or error msg.
+
 ## Transaction
 
 ### BEGIN
diff --git a/server/cmd_server.go b/server/cmd_server.go
index 198003c..d71da77 100644
--- a/server/cmd_server.go
+++ b/server/cmd_server.go
@@ -2,8 +2,11 @@ package server
 
 import (
 	"github.com/siddontang/go/hack"
+	"github.com/siddontang/go/num"
+
 	"strconv"
 	"strings"
+	"time"
 )
 
 func pingCommand(c *client) error {
@@ -85,6 +88,47 @@ func flushdbCommand(c *client) error {
 	return nil
 }
 
+func timeCommand(c *client) error {
+	if len(c.args) != 0 {
+		return ErrCmdParams
+	}
+
+	t := time.Now()
+
+	//seconds
+	s := t.Unix()
+	n := t.UnixNano()
+
+	//micro seconds
+	m := (n - s*1e9) / 1e3
+
+	ay := []interface{}{
+		num.FormatInt64ToSlice(s),
+		num.FormatInt64ToSlice(m),
+	}
+
+	c.resp.writeArray(ay)
+	return nil
+}
+
+func configCommand(c *client) error {
+	if len(c.args) < 1 {
+		return ErrCmdParams
+	}
+
+	switch strings.ToLower(hack.String(c.args[0])) {
+	case "rewrite":
+		if err := c.app.cfg.Rewrite(); err != nil {
+			return err
+		} else {
+			c.resp.writeStatus(OK)
+			return nil
+		}
+	default:
+		return ErrCmdParams
+	}
+}
+
 func init() {
 	register("ping", pingCommand)
 	register("echo", echoCommand)
@@ -92,4 +136,6 @@ func init() {
 	register("info", infoCommand)
 	register("flushall", flushallCommand)
 	register("flushdb", flushdbCommand)
+	register("time", timeCommand)
+	register("config", configCommand)
 }
diff --git a/tools/redis_import/README.md b/tools/redis_import/README.md
index 634ed60..e93f847 100644
--- a/tools/redis_import/README.md
+++ b/tools/redis_import/README.md
@@ -1,6 +1,5 @@
 ## Notice
 
-1. The tool doesn't support `set` data type.
 2. The tool doesn't support `bitmap` data type.
 2. Our `zset` use integer instead of double, so the zset float score in Redis 
    will be **converted to integer**.
diff --git a/tools/redis_import/redis_import.py b/tools/redis_import/redis_import.py
index 7a463ae..7036f89 100644
--- a/tools/redis_import/redis_import.py
+++ b/tools/redis_import/redis_import.py
@@ -35,7 +35,7 @@ def set_ttl(redis_client, ledis_client, key, k_type):
         "string": ledis_client.expire,
         "list": ledis_client.lexpire,
         "hash": ledis_client.hexpire,
-        "set": ledis_client.zexpire,
+        "set": ledis_client.sexpire,
         "zset": ledis_client.zexpire
     }
     timeout = redis_client.ttl(key)
@@ -46,6 +46,7 @@ def set_ttl(redis_client, ledis_client, key, k_type):
 def copy_key(redis_client, ledis_client, key, convert=False):
     global entries
     k_type = redis_client.type(key)
+
     if k_type == "string":
         value = redis_client.get(key)
         ledis_client.set(key, value)
@@ -66,6 +67,7 @@ def copy_key(redis_client, ledis_client, key, convert=False):
         entries += 1
 
     elif k_type == "zset":
+        # dangerous to do this?
         out = redis_client.zrange(key, 0, -1, withscores=True)
         pieces = od()
         for i in od(out).iteritems():
@@ -74,6 +76,14 @@ def copy_key(redis_client, ledis_client, key, convert=False):
         set_ttl(redis_client, ledis_client, key, k_type)
         entries += 1
 
+    elif k_type == "set":
+        mbs = list(redis_client.smembers(key))
+
+        if mbs is not None:
+            ledis_client.sadd(key, *mbs)
+            set_ttl(redis_client, ledis_client, key, k_type)
+            entries += 1
+
     else:
         print "KEY %s of TYPE %s is not supported by LedisDB." % (key, k_type)
 
diff --git a/tools/redis_import/test.py b/tools/redis_import/test.py
index 96cceeb..0279c26 100644
--- a/tools/redis_import/test.py
+++ b/tools/redis_import/test.py
@@ -47,6 +47,9 @@ def random_zset(client, words, length=1000):
     client.zadd("zsetName", **d)
 
 
+def random_set(client, words, length=1000):
+    client.sadd("setName", *words)
+
 def test():
     words = get_words()
     print "Flush all redis data before insert new."
@@ -64,10 +67,9 @@ def test():
     random_zset(rds, words)
     print "random_zset done"
 
+    random_set(rds, words)
+    print "random_set done"
 
-    lds.lclear("listName")
-    lds.hclear("hashName")
-    lds.zclear("zsetName")
     copy(rds, lds, convert=True)
 
     # for all keys
@@ -101,6 +103,7 @@ def ledis_ttl(ledis_client, key, k_type):
         "list": lds.lttl,
         "hash": lds.httl,
         "zset": lds.zttl,
+        "set": lds.sttl,
     }
     return ttls[k_type](key)
 
@@ -115,6 +118,9 @@ def test_ttl():
             assert ledis_ttl(lds, key, k_type) > 0
 
 if __name__ == "__main__":
+    rds.flushdb()
+    lds.flushdb()
+
     test()
     test_ttl()
     print "Test passed."