[LAD] [OT] bash vs disk activity

[Patrick Shirkey]

On Tue, 2007-10-09 at 09:16 -0400, Forest Bond wrote:
> Hi,
> 
> On Tue, Oct 09, 2007 at 01:11:38PM +0200, Lars Luthman wrote:
> > On Tue, 2007-10-09 at 14:02 +0300, Sampo Savolainen wrote:
> > > Quoting Patrick Shirkey <pshirkey at boosthardware.com>:
> > > 
> > > > For example if I transfer 200mb to a usb disk the copy command takes
> > > > about 30 seconds before it returns and the data takes about 5 minutes
> > > > before it is actually finished being transferred and the device is
> > > > unmountable. 
> > > 
> > > quick-hack(tm)
> > > 
> > > (cp -a /xxx /usb_device && sync) &
> > >  
> > > But remember sync flushes _everything_.
> > 
> > Slightly-slower-hack: add the 'sync' option to whatever script or config
> > file is used to mount the device (/etc/fstab, udev rules, KDE service
> > menu etc). That way all writes will be synchronised automatically.
> 
> It sounds like this doesn't matter much for you, but keep in mind that -o sync
> doesn't cause reads to be unbuffered, so don't go trying to benchmark your flash
> devices that way!

Hmm, I need speed and accuracy. 



-- 
Patrick Shirkey
Boost Hardware Ltd.