diff --git a/Cargo.toml b/Cargo.toml
index f34f025..79ed93f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ members = [
 
 [package]
 name = "fast_log"
-version = "1.6.8"
+version = "1.6.9"
 description = "Rust async log High-performance asynchronous logging"
 readme = "Readme.md"
 authors = ["ce <zhuxiujia@qq.com>"]
@@ -35,4 +35,5 @@ parking_lot = "0.12"
 zip = { version = "0.6", optional = true }
 lz4_flex = { version = "0.11", optional = true }
 flate2 = { version = "1.0", optional = true}
-memmap2 = {version = "0.7.1", optional = true}
\ No newline at end of file
+memmap2 = {version = "0.9.0", optional = true}
+
diff --git a/benches/log_mmap.rs b/benches/log_mmap.rs
deleted file mode 100644
index bb44df2..0000000
--- a/benches/log_mmap.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-#![feature(test)]
-#![feature(bench_black_box)]
-extern crate test;
-
-use fast_log::Config;
-
-use fast_log::consts::LogSize;
-use fast_log::plugin::file_mmap::MmapFile;
-use fast_log::plugin::file_split::KeepType;
-use fast_log::plugin::packer::LogPacker;
-use test::{black_box, Bencher};
-
-// 90 ns/iter (+/- 1065)
-#[bench]
-fn bench_log_mmap(b: &mut Bencher) {
-    fast_log::init(
-        Config::new()
-            .chan_len(Some(100000))
-            .console()
-            .split::<MmapFile, LogPacker>(
-                "target/logs/temp.log",
-                LogSize::MB(100),
-                KeepType::All,
-                LogPacker {},
-            ),
-    )
-    .unwrap();
-    b.iter(|| {
-        black_box({
-            log::info!("Commencing yak shaving");
-        });
-    });
-}
diff --git a/example/src/split_log_mmap.rs b/example/src/split_log_mmap.rs
index 367a39e..119c3b2 100644
--- a/example/src/split_log_mmap.rs
+++ b/example/src/split_log_mmap.rs
@@ -9,14 +9,14 @@ fn main() {
         Config::new()
             .chan_len(Some(100000))
             .console()
-            .split::<MmapFile, LogPacker>(
+            .split::<MmapFile, KeepType, LogPacker>(
                 "target/logs/temp.log",
                 LogSize::MB(1),
                 KeepType::All,
                 LogPacker {},
             ),
     )
-    .unwrap();
+        .unwrap();
     for _ in 0..40000 {
         log::info!("Commencing yak shaving");
     }
diff --git a/src/formats.rs b/src/formats.rs
index 5f5f6b6..c5de30b 100644
--- a/src/formats.rs
+++ b/src/formats.rs
@@ -28,8 +28,7 @@ impl RecordFormat for FastLogFormat {
                         fastdate::DateTime::from(arg.now).set_offset(fastdate::offset_sec())
                     }
                     TimeType::Utc => fastdate::DateTime::from(arg.now),
-                }
-                .to_string();
+                };
                 if arg.level.to_level_filter() <= self.display_line_level {
                     arg.formated = format!(
                         "{:27} {} {}:{} {}\n",