[sclug] Re: performance puzzle

[Graham]

A HOLE! (Thats the file, not you ...)

You are misdirecting us into presuming that you did
what we would, in such a circumstance. (perf testing)
This is a trick question.

> 4763dafae2d293e98b62979a00308158  baz
> 
> real    0m21.172s
> user    0m3.010s
> sys     0m1.225s
> 
> 4763dafae2d293e98b62979a00308158  foo
> 
> real    0m4.554s
> user    0m3.201s
> sys     0m1.341s
> # 

The CPU still has to do similar work, (more!)
but the disk transfer isnt "sand through the hourglass",
saving 15-21 seconds.

The interesting thing is that the user + sys is higher.
Can you run this many times and get an average?
Maybe the sampling whilst blocked is inaccurate.
What happens with time cat or time dd ? (md5 is cpu bound)

Graham