Re: change in handling missing data.

[Dmitri A. S. <das...@gm...>]

On 8/7/06, Ethan A Merritt <merritt@u.washington.edu> wrote:
> On Sunday 06 August 2006 10:07 pm, Dmitri A. Sergatskov wrote:
...
>
> For plot "t.dat" using ($1):($2)
> 4.456u 2.342s 0:06.79 100.0%    0+0k 0+0io 0pf+0w
>
> > I did multiple passes, so I am pretty sure the data file is in disk cache.
> > All this is on FedoraCore 5/ Pentiun4 2.6GHz / 2GB of RAM
>
> So it runs faster on my machine, but yes it spends more time on the second test.

I am surprised that the difference is so large. I tried running both
hyperthreaded and non-hyperthreaded and it is pretty much the same.
May be the data format matters?

My file is available at
ftp://coffee.phys.unm.edu/pub/dima/incoming/t-das.dat.bz2

(it is 11 Meg)

You can drop off yours to there as well.

I've also tried GNU time (/usr/bin/time, instead of using
built-in bash time); it gives slightly more info, and the only big
difference I've noticed was:

(plot w/o using):

Involuntary context switches: 452

(plot with using ($1):($2))

Involuntary context switches: 1165

Perhaps evaluation of a token trashes the CPU cache ...

> --
> Ethan A Merritt
>

Sincerely,

Dmitri.
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