On Sun, 27 Jun 1999 11:45:37 -0400, Pierre Abbat <[EMAIL PROTECTED]> wrote:
> > But the fact is that the performance of my mounted hdd win98 (vfat)
> > partition is very low. All my normal linux (ext2) partitions work with
> > normal performance.
>
> cd to various directories, then type vdir|wc -l in each. This tells you
> how many files the directory has. The more files, the longer it takes to
> sort them. vdir -U lists the directory without sorting it, which is a
> little faster.
I too find that performance on fat/vfat partitions is low compared to ext2
partitions, but I don't think that's too surprising: the kernel is
understandably optimised for ext2, and FAT partitions are hardly the most
efficient of filesystems in the first place. To be honest, I don't see a
lot of difference in performance on fat partitions whether or not mprime
is running.
> mprime just writes once every 30 minutes, so whether it's running in the
> Windows drive or the Linux drive is inconsequential. As to the swapping,
> the swap daemon runs at 12 naughty, so I don't see why mprime at 20 nice
> would bother it at all.
On one of my machines, disk performance appears significantly worse with
mprime running than when it's switched off. On my P200MMX, performance on
a Quantum Fireball ST4.3A drops from about 8.25MB/s to 4.9MB/s (measured
using hdparm). However the performance of the Seagate drive on the same
machine and the Fujitsu drive on my PII-266 is barely affected by mprime.
Still, I'd rather lose a little on disk performance than waste over 96% of
my workstation's CPU cycles :-)
One write every 30 minutes is hardly going to trouble things much. I'd far
rather have the machine doing regular disk writes than risk losing several
weeks' (your uptime may vary) work if mprime is not terminated neatly.
--
-------------------- Robin Stevens <[EMAIL PROTECTED]> --------------------
Merton College, Oxford OX1 4JD, UK http://www-astro.physics.ox.ac.uk/~rejs/
(+44) (0)1865: 726796 (home) 273337 (work) 273390 (fax) Pager: 0839 629682
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