![如何检查 ureadahead 是否正常运行](https://linux22.com/image/981738/%E5%A6%82%E4%BD%95%E6%A3%80%E6%9F%A5%20ureadahead%20%E6%98%AF%E5%90%A6%E6%AD%A3%E5%B8%B8%E8%BF%90%E8%A1%8C.png)
我得到了一个转速为 5400 rpm 的 1Gb 驱动器。
启动需要69 秒(它慢吗?)并且/var/lib/ureadahead
包含空目录debugfs
。这就是为什么我想知道 ureadahead 是否能完成它的工作。
/var
目录位于根分区上
~ > df
Filesystem Size Used Avail Use% Mounted on
/dev/sda7 24G 15G 8,1G 65% /
udev 3,9G 4,0K 3,9G 1% /dev
/dev/sda9 705G 143G 562G 21% /data
/dev/sda8 29G 24G 4,2G 85% /home
配置似乎是默认的
~ > cat /etc/init/ureadahead.conf|grep -v '#'|grep -ve '^$'
description "Read required files in advance"
start on starting mountall
stop on stopped rc
expect fork
kill timeout 180
normal exit 0
exec /sbin/ureadahead --daemon
pre-stop exec sleep 45
~ > cat /etc/init/ureadahead-other.conf|grep -v '#'|grep -ve '^$'
description "Read required files in advance (for other mountpoints)"
start on mounted DEVICE=[/UL]* MOUNTPOINT=/?*
expect fork
normal exit 0 4
exec /sbin/ureadahead --daemon $MOUNTPOINT
奇怪的是,/var/log/upstart/ureadahead.log.1.gz 几乎只包含“忽略相对路径”或“没有此文件或目录”标记的条目。
root:/var/log# zcat upstart/ureadahead.log.1.gz |grep -v "Ignored relative path"
Counted 4 CPUs
ureadahead:/data/swapfile: Error retrieving chunk extents: Operation not supported
ureadahead:/var/lib/NetworkManager/dhclient-eth0.conf: No such file or directory
ureadahead:/var/lib/NetworkManager/dhclient-wlan0.conf: No such file or directory
ureadahead:/var/lib/NetworkManager/dhclient-eth0.conf: No such file or directory
ureadahead:/var/lib/NetworkManager/dhclient-wlan0.conf: No such file or directory
ureadahead:/etc/X11/xorg.conf: No such file or directory
ureadahead:/var/lib/NetworkManager/dhclient-eth0.conf: No such file or directory
ureadahead:/var/lib/NetworkManager/dhclient-wlan0.conf: No such file or directory
ureadahead:/var/lib/NetworkManager/dhclient-eth0.conf: No such file or directory
ureadahead:/var/lib/NetworkManager/dhclient-wlan0.conf: No such file or directory
ureadahead:/usr/share/X11/xorg.conf.d/20-intel.conf: No such file or directory
Counted 4 CPUs
ureadahead:/data/swapfile: Error retrieving chunk extents: Operation not supported
在 bootchart 上,ureadahead 出现在16秒,持续时间不到一秒。比较https://superuser.com/questions/286571/ubuntu-slow-startup-time-modprobeureadahead 在 plymouthd 之后立即启动
更新 1添加 blockdev 报告
# blockdev --report
RO RA SSZ BSZ StartSec Size Device
rw 256 512 4096 0 1000204886016 /dev/sda
rw 256 512 4096 2048 524288000 /dev/sda1
rw 256 512 4096 1026048 41943040 /dev/sda2
rw 256 512 4096 1107968 134217728 /dev/sda3
rw 256 512 4096 1370112 524288000 /dev/sda4
rw 256 512 4096 2394112 171795546112 /dev/sda5
rw 256 512 4096 1927233536 13460267008 /dev/sda6
rw 256 512 4096 337932288 26214400000 /dev/sda7
rw 256 512 4096 389132288 31457280000 /dev/sda8
rw 256 512 4096 450572288 756050558976 /dev/sda9
rw 256 512 512 0 1073741312 /dev/sr0
分区 /dev/sda1 - /dev/sda/6 是 windoze、ESP、DIAGS、WINRETOOLS、PBR 图像