On Tue, 3 Mar 2009, Steve Holdoway wrote:
Noo... you should always sync twice: disk then network (: ( and anyone who says 3 times is even older than me! )
So it's my age eh? So is why I always unmount my usb pens like... sync;sync;sync;umount /dev/sdc I just said sync instead of sync;sync for the benchmark since I have never spotted a human visible time difference between saying it once instead of twice. (Certainly seen huge differences between sync'ing and not sync'ing.)
The best one I ever came across was a non-technical ex boss who got a bunch of Indians ( schoolkids I think ) to benchmark some code. After starting off 4 copies of the code, the test failed, and a serious problem was indicated because they finished in a different order. A serious case of YGWYPF.
That case was probably just a bug, But you do get cases where the OS associates multiple processes (> 2) with a dual core. And depending on what happens when exactly, you can get working code completing out of sequence! Although the Atom in the EEE 901 is hyperthreaded, not multicore, so that isn't one of the gotchas biting Craig. John Carter Phone : (64)(3) 358 6639 Tait Electronics Fax : (64)(3) 359 4632 PO Box 1645 Christchurch Email : john.car...@tait.co.nz New Zealand
