Garance A Drosihn <[EMAIL PROTECTED]> writes:
> At 10:01 AM -0400 4/25/01, John W. De Boskey wrote:
> > I have reduced the runtime of the process so far by a solid
> >hour. My change to cp is the lowest level/minimal change fix
> >which allows me to maintain a O(1) time constraint. I've played
> >with (non-freebsd) versions of xargs already, and found them
> >(the various algorithms in xargs) to be more expensive than the
> >patch to cp.
>
> It is inconceivable that the proposed patch to 'xargs' would
> increase your running time. I don't mean the standard '-I'
> change, which would certainly destroy performance, but the
> proposed patch to 'xargs' which solves your specific problem
> in a general way.
>
> I'm still curious as to why you think the proposed change to
> xargs will cause you ANY performance problem. I simply can
> not imagine where you would get a performance problem from
> the -Y idea (though I'm still tempted to change the letter
> for that proposed option).
I think everything that should have been said in this thread already
has been (so I won't repeat it), except for the performace bit. As
the author of the patch, I doubt it would hinder performance. All it
does is move one part of a loop further down. Instead of doing
something once, it does part of that job twice. This job acts on
arguments *to xargs* (i.e., argv), and is nothing more than pointer
arithmetic and assignment. Unless you give umpteen arguments *to
xargs*, you shouldn't notice a difference in execution speed.
And as you (gad) said, implementing -I the way SUSv2 defines it would
most likely kill performance (most likely it'd also slow down whether
you actually use that option or not).
> Dimi has written one or two different patches to xargs. Did
^^^ <-- should be 'a', but that's okay. :-)
One patch.
Thanks,
Dima Dorfman
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