DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:reply-to:mime-version:to
	:subject:references:in-reply-to:content-type
	:content-transfer-encoding; q=dns; s=default; b=C1u6oXW0dlTsbQS8
	E0fStMwzhRU+x2sNuNTXyVcc6O+pr3yap9fahEoKb2EmcoPFMSvVFiCO2r3daHZ2
	zr5fAo8fgk3SOpesdYotxzGF2prfa+HGbsTBdqBfoh/w2G7FVDL66rqDZJWqg7BN
	rqi/V9EvIf+wAU/r1C4PbMk1Flk=
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Message-id: <52432BDB.7080809@cygwin.com>
Date: Wed, 25 Sep 2013 14:30:51 -0400
From: "Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
Reply-to: cygwin AT cygwin DOT com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8
MIME-version: 1.0
To: cygwin AT cygwin DOT com
Subject: Re: cp vs copy performance over local network
References: <CAJyLC6sbpLsGXpt2U8u1QOCw+7AhYuo73Q8e2V_K=fu7ujaKkg AT mail DOT gmail DOT com>
In-reply-to: <CAJyLC6sbpLsGXpt2U8u1QOCw+7AhYuo73Q8e2V_K=fu7ujaKkg@mail.gmail.com>
Content-type: text/plain; charset=ISO-8859-1; format=flowed
Content-transfer-encoding: 7bit

On 9/25/2013 1:17 PM, Wm. David Bentlage wrote:
> Greetings,
>
> I've often noticed that there's a big difference in the performance
> between Cygwin cp and Windows copy over the local network -- cp
> usually takes twice as long for the same operation.  Here's an
> example:
>
> muser AT A4826995 /c/Users/Muser
> $ time cmd /c copy \\\\server\\w\\cygwin.zip .
>          1 file(s) copied.
>
> real    0m7.344s
> user    0m0.015s
> sys     0m0.046s
>
> muser AT A4826995 /c/Users/Muser
> $ time cp \\\\server\\w\\cygwin.zip .
>
> real    0m18.559s
> user    0m0.046s
> sys     0m2.432s
>
> muser AT A4826995 /c/Users/Muser
> $ uname -a
> CYGWIN_NT-6.1-WOW64 A4826995 1.7.17(0.262/5/3) 2012-10-19 14:39 i686 Cygwin
>
> muser AT A4826995 /c/Users/Muser
> $ ls -lh cygwin.zip
> -rw-r--r-- 1 muser Users 513M Sep 25 11:47 cygwin.zip
>
> Why is this?  Is there something I can do to increase the performance of cp?

Use '-l'. ;-)

There's overhead to handle POSIX permissions, etc.  Perhaps copying to a
mount point with 'noacl' would help.  Otherwise, you can see all the things
that are happening by stracing 'cp'.  It may point you to some hints/ideas.

-- 
Larry

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple