On Tue, Jul 14, 2009 at 08:54:36AM +0200, Ross wrote:
> Ok, build 117 does seem a lot better. The second run is slower,
> but not by such a huge margin.
Hm, I can't support this:
SunOS fred 5.11 snv_117 sun4u sparc SUNW,Sun-Fire-V440
The system has 16GB of Ram, pool is mirrored over two FUJITSU-MBA3147NC.
>-1007: sudo ksh zfs-cache-test.ksh
zfs create rpool/zfscachetest
Creating data file set (4000 files of 8192000 bytes) under /rpool/zfscachetest
...
Done!
zfs unmount rpool/zfscachetest
zfs mount rpool/zfscachetest
Doing initial (unmount/mount) 'tar to /dev/null'
real 5m12.61s
user 0m0.30s
sys 1m28.36s
Doing second 'tar to /dev/null'
real 11m13.93s
user 0m0.22s
sys 1m37.41s
Feel free to clean up with 'zfs destroy rpool/zfscachetest'.
user=2.32 sec, sys=343.41 sec, elapsed=23:39.41 min, cpu use=24.3%
And here's what arcstat.pl has to say when starting the second read:
Time read miss miss% dmis dm% pmis pm% mmis mm% arcsz c
11:53:26 11K 895 7 41 0 854 100 13 100 13G 13G
11:53:27 12K 832 6 39 0 793 100 13 100 13G 13G
11:53:28 11K 832 7 39 0 793 100 13 100 13G 13G
11:53:29 11K 832 7 39 0 793 100 13 76 13G 13G
11:53:30 12K 896 7 42 0 854 100 14 100 13G 13G
11:53:31 11K 832 7 39 0 793 100 13 100 13G 13G
11:53:32 11K 768 6 36 0 732 100 12 100 13G 13G
11:53:33 11K 832 7 39 0 793 100 13 100 13G 13G
11:53:34 7K 497 7 253 3 244 99 4 11 13G 13G
11:53:35 5K 385 7 385 7 0 0 0 0 13G 13G
11:53:36 5K 374 7 374 7 0 0 0 0 13G 13G
11:53:37 5K 368 7 368 7 0 0 0 0 13G 13G
11:53:38 4K 340 7 340 7 0 0 0 0 13G 13G
11:53:39 5K 383 7 383 7 0 0 0 0 13G 13G
11:53:40 5K 406 7 406 7 0 0 0 0 13G 13G
11:53:41 4K 360 7 360 7 0 0 0 0 13G 13G
11:53:42 4K 328 7 328 7 0 0 0 0 13G 13G
11:53:43 4K 346 7 346 7 0 0 0 0 13G 13G
11:53:44 4K 346 7 346 7 0 0 0 0 13G 13G
11:53:45 4K 319 7 319 7 0 0 0 0 13G 13G
11:53:47 4K 337 7 337 7 0 0 0 0 13G 13G
I used tar in this run instead of cpio, just to give it a try...
[time (find . -type f | xargs -i tar cf /dev/null {} )]
Another run with Bob's new script: (rpool/zfscachetest not destroyed before
this run, so wall clock time below is lower)
>-1008: sudo ksh zfs-cache-test.ksh.1
zfs unmount rpool/zfscachetest
zfs mount rpool/zfscachetest
Doing initial (unmount/mount) 'cpio -C 131072 -o > /dev/null'
64000512 blocks
real 4m40.25s
user 0m7.96s
sys 1m28.62s
Doing second 'cpio -C 131072 -o > /dev/null'
64000512 blocks
real 11m0.08s
user 0m7.37s
sys 1m38.58s
Feel free to clean up with 'zfs destroy rpool/zfscachetest'.
user=15.35 sec, sys=187.87 sec, elapsed=15:43.65 min, cpu use=21.5%
Not much difference to the "tar"-run...
Kurt
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