提升磁盘小微文件的读写性能

ext4是一个强大的文件系统，但是默认挂载时，其日志功能在文件操作大量出现时，严重影响性能。

通过添加以下参数，可以稍微缓解性能。

noatime,nodiratime,barrier=0,commit=60

添加完之后如下：

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda2 during installation
UUID=ad757852 /               ext4    errors=remount-ro,noatime,nodiratime,barrier=0,commit=60 0       1
# /boot/efi was on /dev/sda1 during installation
UUID=F8ED /boot/efi       vfat    umask=0077      0       1
#/swapfile                                 none            swap    sw              0       0

调整前后，小微文件大约有一倍的提升效果。