[wellylug] Writing in slow motion

[David Antliff]

E.Chalaron wrote:
> No not at all.... sorry if my email was confusing, 
> doing 
> cp /home/edouard/mybigfile.mov /mnt/usbdisk/
> id slower than processing my frames from /home/edouard/data 
> to /mnt/usbdisk/mybigfile.mov

Maybe the write performance of the disk your homedir is on is actually 
worse than your USB disk?

Does 'processing frames'involve constantly reading data from your 
homedir? Is the amount of information written out to the USB disk *more* 
than the 'processing' app reads in? If this is the case, then it's a 
case of (reads<writes) < (reads=writes) where writes is a constant 
amount of data, as the CPU is capable of generating data much faster 
than any HDD read op. I could explain better but I'm already late for work.

There are tools to test the speed of your disks - bonnie++ is one.

-- 
David.