[Emacs-bug-tracker] bug#7715: closed (cp command on Linux )

[GNU bug Tracking System]

Your message dated Wed, 22 Dec 2010 17:50:52 -0800
with message-id <address@hidden>
and subject line Re: bug#7715: cp command on Linux
has caused the GNU bug report #7715,
regarding cp command on Linux 
to be marked as done.

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-- 
7715: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7715
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--- Begin Message --- Subject: cp command on Linux Date: Wed, 22 Dec 2010 16:07:20 -0500

Hi

I do not log any bug for cp command. In our company, we copy huge Cobol files before processing data. This is to rollback our data files.

Suppose A1 is my huge file of 60GB and A1.bk is its backup file, before we process ( change ) data into A1. Then which of our method

would be faster?

1. Method-1 ( A1.bk exists )
    $ cp  A1 A1.bk

2. Method-2 
    $ rm -f A1.bk
    $ cp A1 A1.bk

3. Method-3
    $ cp --remove-destination A1 A1,bk

This operation is very simple. But our operators tell, in some cases cp takes longer time. How can we reduce copying time?

Thanks
Hemant Rumde
ING US
Boston US

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--- End Message ---

> --- Begin Message ---
>
>
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> Subject: 
>
> Re: bug#7715: cp command on Linux
>
>
>
>
> Date: 
>
> Wed, 22 Dec 2010 17:50:52 -0800
>
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> User-agent: 
>
> Mozilla/5.0 (X11; U; Linux i686; en-US;	rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7
>
>
>
>
> On 12/22/2010 01:07 PM, Hemant Rumde wrote:
> > Then which of our method would be faster?
>
> Method 3 is probably a tad faster than method 2,
> but whether 1 or 3 is faster depends on the
> underlying implementation.  If you're seeing
> wildly different performance numbers I'd look
> there, not at 'cp' itself.
>
>
> --- End Message ---