xfs日志的大小对删除文件的速度的影响-优快云博客

本文链接：https://blog.youkuaiyun.com/heart_2011/article/details/7293208

本文探讨了XFS文件系统中日志大小如何影响删除小文件和大文件的速度。实验结果显示，日志大小从128M减小到2M时，对于小文件系统，删除速度仅略微下降；而对于大文件系统，删除速度显著降低，时间从1分13秒增加到1分54秒。

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一小文件系统

(1) 文件系统的大小

root:/share/nas# df -h
Filesystem            Size Used Avail Use% Mounted on
/dev/hda1             600M 219M 382M 37% /
shm                  1001M     0 1001M   0% /dev/shm
/dev/mapper/dg5-nas   373G 373G   20K 100% /share/nas
root:/share#

(2)文件的数量
root:/share/nas# ls -l |wc -l
12734

(3)内存的大小

root:/share/nas# echo '3'>/proc/sys/vm/drop_caches
root:/share/nas# free -m
             total       used       free     shared    buffers     cached
Mem:          2000        378       1622          0          0        216
-/+ buffers/cache:        162       1838
Swap:            0          0          0

log size = 128M
root:/share/nas# time rm -rf *

real    0m4.839s
user    0m0.010s
sys     0m0.660s

log size = 2m

root:/share/nas# time rm -rf *

real    0m5.878s
user    0m0.010s
sys     0m0.610s

二大文件系统

(1) 文件系统的大小
root:/share/nas# df -h
Filesystem            Size Used Avail Use% Mounted on
/dev/hda1             600M 220M 381M 37% /
shm                  1001M     0 1001M   0% /dev/shm
/dev/mapper/dg5-nas   3.7T 3.7T   20K 100% /share/nas

(2)文件的数量
root:/share/nas# ls -l|wc -l
127230
root:/share/nas# echo '3' >/proc/sys/vm/drop_caches

(3)内存的大小
root:/share/nas# free -m
             total       used       free     shared    buffers     cached
Mem:          2000        384       1616          0          0        216
-/+ buffers/cache:        167       1833
Swap:            0          0          0

log size =128 M
root:/share/nas# time rm -rf *

real    1m13.174s
user    0m0.130s
sys     0m6.580s

log size = 2M
root:/share/nas# time rm -rf *

real    1m54.262s
user    0m0.140s
sys     0m7.050s