Hi,
sorry, I fat-finger-mouse-clicked and sent the last message while unrm was
still running :-| Below is the rest of the time measurements.
After some more head-scratching, I think I have an explanation for the
points where the allocation strategy changes. The first change occurres,
after approx. 750 MB have been written to disk. This is the point, where
all existing cylinder groups have been filled to 25%. The second change
occurres slightly above 1.5 GB, i.e. all cylinder groups in the FS are
now 50% full.
Best regards,
Knut
> The machine is a 1995 99 MHz PARisc and one 9GB disc is connected to
> the fast narrow SCSI bus. Both the unrm "source" and "target" partition
> reside on the same physical drive, so I assume there is a lot of
> head-movement involved... Also, the high amount of fragmentation that
> I observed in the "source" file might slow things down a bit.
>
> # time bigfile 2113536 > /big/bigfile
>
> real 12:21.4
> user 9:29.1
> sys 2:11.0
[ filling up /big ]
# df -g /big
/big (/dev/vg00/lvol4 ) :
8192 file system block size 1024 fragment size
3005449 total blocks 0 total free blocks
0 allocated free blocks 492800 total i-nodes
492786 total free i-nodes 492786 allocated free i-nodes
1073741828 file system id hfs file system type
0x10 flags 255 file system name length
/big file system specific string
# ls -l /big/bigfile
-rw-rw-rw- 1 root sys 2164260864 Jul 5 18:21 /big/bigfile
# rm /big/bigfile
# time /usr/local/tct/bin/unrm /dev/vg00/lvol4 > /big2/unrm-out
real 2:46:13.1
user 51.8
sys 6:08.9
# time checkbig < /big2/unrm-out > /big2/checklog3
real 11:14.0
user 1:49.9
sys 4:07.1
I also started another unrm using /dev/vg00/rlvol4 .
Results look pretty similar so far: 120 MB in the first 10 minutes...
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