Date: Wed, 14 Feb 2007 09:07:29 -0600 From: Eric Anderson <anderson@freebsd.org> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: fsck times/memory sizes/etc Message-ID: <45D325B1.7030607@freebsd.org> In-Reply-To: <45D321F8.2000808@centtech.com> References: <45D321F8.2000808@centtech.com>
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One more test appended to this mail:
On 02/14/07 08:51, Eric Anderson wrote:
> 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
>
>
>
>
>
##################################################
# newfs -b 16384 -f 2048 -i 262144 /dev/ad2s2a
/dev/ad2s2a: 65397.4MB (133933888 sectors) block size 16384, fragment
size 2048
using 294 cylinder groups of 223.11MB, 14279 blks, 896 inodes.
# 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, 33445795 free (19 frags, 4180722 blocks, 0.0%
fragmentation)
real 0m9.703s
user 0m0.410s
sys 0m0.049s
# memory usage reached max of 9344kb (9MB)
# fill it up
# df -i /mnt
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted on
/dev/ad2s2a 66891594 4342 61535926 0% 263422 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
263422 files, 2171 used, 33443626 free (26 frags, 4180450 blocks, 0.0%
fragmentation)
real 0m10.491s
user 0m0.610s
sys 0m0.020s
# memory usage reached max of 9344kb (9MB)
# mount, rm -rf all created files/dirs
# df -i /mnt
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted on
/dev/ad2s2a 66891594 4 61540264 0% 2 263420 0% /mnt
# 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, 2 used, 33445795 free (19 frags, 4180722 blocks, 0.0%
fragmentation)
real 0m10.427s
user 0m0.570s
sys 0m0.012s
# memory usage for fsck (on this empty fs) maxed at 9344kb (about 9MB)
##################################################
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