Date: Wed, 14 Feb 2007 08:51:36 -0600 From: Eric Anderson <anderson@centtech.com> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: fsck times/memory sizes/etc Message-ID: <45D321F8.2000808@centtech.com>
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I just did some quick playing around, doing newfs and fsck's on fresh
file systems. I did one set on a 1Gb malloc'ed md, and another on a
65GB real disk device. The disk was only being used for this test,
nothing else.
I don't claim these numbers are perfect, but I did run each test 3-4
times to make sure they were consistent.
I found it interesting that the fsck times didn't reduce once all the
files/directories were deleted.
################################################
# mdconfig -a -t malloc -s 1024m
# time fsck_ufs -f /dev/md0
** /dev/md0
** Last Mounted on
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
2 files, 2 used, 506485 free (21 frags, 63308 blocks, 0.0% fragmentation)
real 0m0.014s
user 0m0.009s
sys 0m0.002s
# mount it
# fill it full of directories and empty files
# df -i /mnt
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted on
/dev/md0 1012974 2340 929598 0% 141310 0 100% /mnt
# umount it
# time fsck_ufs -f /dev/md0
** /dev/md0
** Last Mounted on /mnt
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
141310 files, 1170 used, 505317 free (21 frags, 63162 blocks, 0.0%
fragmentation)
real 0m0.266s
user 0m0.103s
sys 0m0.015s
# mount it, rm all the files
# umount it
# time fsck_ufs -f /dev/md0
** /dev/md0
** Last Mounted on /mnt
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
2 files, 2 used, 506485 free (21 frags, 63308 blocks, 0.0% fragmentation)
real 0m0.151s
user 0m0.045s
sys 0m0.024s
##################################################
# newfs -U /dev/ad2s2a
/dev/ad2s2a: 65397.4MB (133933888 sectors) block size 16384, fragment
size 2048
using 356 cylinder groups of 183.77MB, 11761 blks, 23552 inodes.
with soft updates
# time fsck -f /dev/ad2s2a
** /dev/ad2s2a
** Last Mounted on
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
2 files, 2 used, 32429667 free (19 frags, 4053706 blocks, 0.0%
fragmentation)
real 0m9.673s
user 0m0.449s
sys 0m0.000s
[root@neutrino ~]# mount /dev/ad2s2a /mnt
[root@neutrino ~]# df -i /mnt
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
Mounted on
/dev/ad2s2a 64859338 4 59670588 0% 2 8384508 0% /mnt
# fill it full of directories and empty files
# df -i /mnt
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
Mounted on
/dev/ad2s2a 64859338 138346 59532246 0% 8384510 0 100% /mnt
# umount it
# time fsck -f /dev/ad2s2a
** /dev/ad2s2a
** Last Mounted on /mnt
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
8384510 files, 69173 used, 32360496 free (24 frags, 4045059 blocks, 0.0%
fragmentation)
real 1m57.315s
user 0m6.046s
sys 0m0.811s
# memory usage for fsck maxed at 56448kb (~55MB)
# mount, rm -rf all created files/dirs
# df -i /mnt
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
Mounted on
/dev/ad2s2a 64859338 6 59670586 0% 2 8384508 0% /mnt
# umount it
# time fsck -f /dev/ad2s2a
** /dev/ad2s2a
** Last Mounted on /mnt
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
2 files, 3 used, 32429666 free (18 frags, 4053706 blocks, 0.0%
fragmentation)
real 1m37.347s
user 0m3.054s
sys 0m0.693s
# memory usage for fsck (on this empty fs) maxed at 9344kb (about 9MB)
##################################################
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
An undefined problem has an infinite number of solutions.
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