fsck times/memory sizes/etc

[Eric Anderson]

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 at neutrino ~]# mount /dev/ad2s2a /mnt
> [root at 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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# 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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