From unknown Wed Jun 18 23:09:32 2025 X-Loop: help-debbugs@gnu.org Subject: bug#7715: cp command on Linux Resent-From: "Hemant Rumde" Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-To: owner@debbugs.gnu.org Resent-CC: bug-coreutils@gnu.org Resent-Date: Wed, 22 Dec 2010 23:49:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 7715 X-GNU-PR-Package: coreutils X-GNU-PR-Keywords: To: 7715@debbugs.gnu.org X-Debbugs-Original-To: Received: via spool by submit@debbugs.gnu.org id=B.129306168728627 (code B ref -1); Wed, 22 Dec 2010 23:49:02 +0000 Received: (at submit) by debbugs.gnu.org; 22 Dec 2010 23:48:07 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PVYPd-0007Rc-Q4 for submit@debbugs.gnu.org; Wed, 22 Dec 2010 18:48:06 -0500 Received: from eggs.gnu.org ([140.186.70.92]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PVVnn-0002vp-Ti for submit@debbugs.gnu.org; Wed, 22 Dec 2010 16:00:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PVVuA-0000eI-D2 for submit@debbugs.gnu.org; Wed, 22 Dec 2010 16:07:27 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00,HTML_MESSAGE, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD autolearn=unavailable version=3.3.1 Received: from lists.gnu.org ([199.232.76.165]:41217) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PVVuA-0000eD-AF for submit@debbugs.gnu.org; Wed, 22 Dec 2010 16:07:26 -0500 Received: from [140.186.70.92] (port=51212 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PVVu9-0004XH-E7 for bug-coreutils@gnu.org; Wed, 22 Dec 2010 16:07:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PVVu7-0000dh-Hw for bug-coreutils@gnu.org; Wed, 22 Dec 2010 16:07:25 -0500 Received: from bld9527051.us.ing.com ([204.86.34.37]:45214) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PVVu7-0000dQ-Bd for bug-coreutils@gnu.org; Wed, 22 Dec 2010 16:07:23 -0500 Received: from unknown (HELO PJAXAIPI1000.us.americas.intranet) ([10.172.17.171]) by BLD9527051.us.ing.com with ESMTP; 22 Dec 2010 14:05:45 -0700 X-IronPort-AV: E=Sophos;i="4.60,215,1291611600"; d="scan'208,217";a="476165" Received: from mspa336000.us.americas.intranet (HELO mspa336000.common.ecamericas) ([10.163.221.101]) by PJAXAIPI1000.us.americas.intranet with ESMTP; 22 Dec 2010 16:06:01 -0500 Received: from ironportqcy.corp.citistreet.org ([172.29.24.163]) by mspa336000.common.ecamericas with Microsoft SMTPSVC(6.0.3790.3959); Wed, 22 Dec 2010 15:07:18 -0600 Received: from hwpms008.corp.citistreet.org ([172.29.24.128]) by IronPortQcy.corp.citistreet.org with ESMTP; 22 Dec 2010 16:07:17 -0500 Received: from hwpms002.corp.citistreet.org ([172.29.144.219]) by hwpms008.corp.citistreet.org with Microsoft SMTPSVC(6.0.3790.4675); Wed, 22 Dec 2010 16:07:17 -0500 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CBA21C.36DEC7B2" Date: Wed, 22 Dec 2010 16:07:20 -0500 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: cp command on Linux Thread-Index: AcuiHDi0J7cLf/2fS7Goad5DosBBZw== From: "Hemant Rumde" X-OriginalArrivalTime: 22 Dec 2010 21:07:17.0444 (UTC) FILETIME=[36EC7040:01CBA21C] X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Spam-Score: -6.0 (------) X-Mailman-Approved-At: Wed, 22 Dec 2010 18:48:04 -0500 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -6.0 (------) This is a multi-part message in MIME format. ------_=_NextPart_001_01CBA21C.36DEC7B2 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi=20 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.=20 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 )=20 $ cp A1 A1.bk=20 2. Method-2 =20 $ rm -f A1.bk=20 $ cp A1 A1.bk=20 3. Method-3=20 $ cp --remove-destination A1 A1,bk=20 This operation is very simple. But our operators tell, in some cases cp takes longer time. How can we reduce copying time? Thanks=20 Hemant Rumde=20 ING US=20 Boston US --------------------------------------------------------- NOTICE: The information contained in this electronic mail message is confid= ential and intended only for certain recipients. If you are not an intende= d recipient, you are hereby notified that any disclosure, reproduction, dis= tribution or other use of this communication and any attachments is strictl= y prohibited. If you have received this communication in error, please not= ify the sender by reply transmission and delete the message without copying= or disclosing it. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D ------_=_NextPart_001_01CBA21C.36DEC7B2 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable cp command on Linux

Hi

I do not log any bug for cp command. In ou= r company, we copy huge Cobol files before processing data. This is to roll= back 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 whic= h 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-destinat= ion A1 A1,bk

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

Thanks
Hemant Rumde
ING US
Boston US 

---------------------------------------------------------

NOTICE: The information contained in this electronic mail message is confid=
ential and intended only for certain recipients.  If you are not an intende=
d recipient, you are hereby notified that any disclosure, reproduction, dis=
tribution or other use of this communication and any attachments is strictl=
y prohibited.  If you have received this communication in error, please not=
ify the sender by reply transmission and delete the message without copying=
 or disclosing it.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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------_=_NextPart_001_01CBA21C.36DEC7B2-- From unknown Wed Jun 18 23:09:32 2025 MIME-Version: 1.0 X-Mailer: MIME-tools 5.427 (Entity 5.427) X-Loop: help-debbugs@gnu.org From: help-debbugs@gnu.org (GNU bug Tracking System) To: "Hemant Rumde" Subject: bug#7715: closed (Re: bug#7715: cp command on Linux) Message-ID: References: <4D12AAFC.2000203@cs.ucla.edu> X-Gnu-PR-Message: they-closed 7715 X-Gnu-PR-Package: coreutils Reply-To: 7715@debbugs.gnu.org Date: Thu, 23 Dec 2010 01:45:03 +0000 Content-Type: multipart/mixed; boundary="----------=_1293068703-11497-1" This is a multi-part message in MIME format... ------------=_1293068703-11497-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #7715: cp command on Linux=20 which was filed against the coreutils package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 7715@debbugs.gnu.org. --=20 7715: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D7715 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1293068703-11497-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 7715-done) by debbugs.gnu.org; 23 Dec 2010 01:44:28 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PVaEE-0002yK-N0 for submit@debbugs.gnu.org; Wed, 22 Dec 2010 20:44:27 -0500 Received: from smtp.cs.ucla.edu ([131.179.128.62]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PVaEC-0002y6-GW for 7715-done@debbugs.gnu.org; Wed, 22 Dec 2010 20:44:25 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp.cs.ucla.edu (Postfix) with ESMTP id BEFA539E80F8; Wed, 22 Dec 2010 17:50:59 -0800 (PST) X-Virus-Scanned: amavisd-new at smtp.cs.ucla.edu Received: from smtp.cs.ucla.edu ([127.0.0.1]) by localhost (smtp.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QlUHKl6lrCfZ; Wed, 22 Dec 2010 17:50:59 -0800 (PST) Received: from [192.168.1.10] (pool-71-189-109-235.lsanca.fios.verizon.net [71.189.109.235]) by smtp.cs.ucla.edu (Postfix) with ESMTPSA id 3569439E80F2; Wed, 22 Dec 2010 17:50:59 -0800 (PST) Message-ID: <4D12AAFC.2000203@cs.ucla.edu> Date: Wed, 22 Dec 2010 17:50:52 -0800 From: Paul Eggert Organization: UCLA Computer Science Department User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) Gecko/20101208 Thunderbird/3.1.7 MIME-Version: 1.0 To: Hemant Rumde Subject: Re: bug#7715: cp command on Linux References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Score: -2.9 (--) X-Debbugs-Envelope-To: 7715-done Cc: 7715-done@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -2.9 (--) 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. ------------=_1293068703-11497-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 22 Dec 2010 23:48:07 +0000 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PVYPd-0007Rc-Q4 for submit@debbugs.gnu.org; Wed, 22 Dec 2010 18:48:06 -0500 Received: from eggs.gnu.org ([140.186.70.92]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1PVVnn-0002vp-Ti for submit@debbugs.gnu.org; Wed, 22 Dec 2010 16:00:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PVVuA-0000eI-D2 for submit@debbugs.gnu.org; Wed, 22 Dec 2010 16:07:27 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00,HTML_MESSAGE, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD autolearn=unavailable version=3.3.1 Received: from lists.gnu.org ([199.232.76.165]:41217) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PVVuA-0000eD-AF for submit@debbugs.gnu.org; Wed, 22 Dec 2010 16:07:26 -0500 Received: from [140.186.70.92] (port=51212 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PVVu9-0004XH-E7 for bug-coreutils@gnu.org; Wed, 22 Dec 2010 16:07:26 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PVVu7-0000dh-Hw for bug-coreutils@gnu.org; Wed, 22 Dec 2010 16:07:25 -0500 Received: from bld9527051.us.ing.com ([204.86.34.37]:45214) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PVVu7-0000dQ-Bd for bug-coreutils@gnu.org; Wed, 22 Dec 2010 16:07:23 -0500 Received: from unknown (HELO PJAXAIPI1000.us.americas.intranet) ([10.172.17.171]) by BLD9527051.us.ing.com with ESMTP; 22 Dec 2010 14:05:45 -0700 X-IronPort-AV: E=Sophos;i="4.60,215,1291611600"; d="scan'208,217";a="476165" Received: from mspa336000.us.americas.intranet (HELO mspa336000.common.ecamericas) ([10.163.221.101]) by PJAXAIPI1000.us.americas.intranet with ESMTP; 22 Dec 2010 16:06:01 -0500 Received: from ironportqcy.corp.citistreet.org ([172.29.24.163]) by mspa336000.common.ecamericas with Microsoft SMTPSVC(6.0.3790.3959); Wed, 22 Dec 2010 15:07:18 -0600 Received: from hwpms008.corp.citistreet.org ([172.29.24.128]) by IronPortQcy.corp.citistreet.org with ESMTP; 22 Dec 2010 16:07:17 -0500 Received: from hwpms002.corp.citistreet.org ([172.29.144.219]) by hwpms008.corp.citistreet.org with Microsoft SMTPSVC(6.0.3790.4675); Wed, 22 Dec 2010 16:07:17 -0500 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CBA21C.36DEC7B2" Subject: cp command on Linux Date: Wed, 22 Dec 2010 16:07:20 -0500 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: cp command on Linux Thread-Index: AcuiHDi0J7cLf/2fS7Goad5DosBBZw== From: "Hemant Rumde" To: X-OriginalArrivalTime: 22 Dec 2010 21:07:17.0444 (UTC) FILETIME=[36EC7040:01CBA21C] X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Spam-Score: -6.0 (------) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Wed, 22 Dec 2010 18:48:04 -0500 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: debbugs-submit-bounces@debbugs.gnu.org Errors-To: debbugs-submit-bounces@debbugs.gnu.org X-Spam-Score: -6.0 (------) This is a multi-part message in MIME format. ------_=_NextPart_001_01CBA21C.36DEC7B2 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi=20 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.=20 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 )=20 $ cp A1 A1.bk=20 2. Method-2 =20 $ rm -f A1.bk=20 $ cp A1 A1.bk=20 3. Method-3=20 $ cp --remove-destination A1 A1,bk=20 This operation is very simple. But our operators tell, in some cases cp takes longer time. How can we reduce copying time? Thanks=20 Hemant Rumde=20 ING US=20 Boston US --------------------------------------------------------- NOTICE: The information contained in this electronic mail message is confid= ential and intended only for certain recipients. If you are not an intende= d recipient, you are hereby notified that any disclosure, reproduction, dis= tribution or other use of this communication and any attachments is strictl= y prohibited. If you have received this communication in error, please not= ify the sender by reply transmission and delete the message without copying= or disclosing it. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D ------_=_NextPart_001_01CBA21C.36DEC7B2 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable cp command on Linux

Hi

I do not log any bug for cp command. In ou= r company, we copy huge Cobol files before processing data. This is to roll= back 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 whic= h 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-destinat= ion A1 A1,bk

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

Thanks
Hemant Rumde
ING US
Boston US 

---------------------------------------------------------

NOTICE: The information contained in this electronic mail message is confid=
ential and intended only for certain recipients.  If you are not an intende=
d recipient, you are hereby notified that any disclosure, reproduction, dis=
tribution or other use of this communication and any attachments is strictl=
y prohibited.  If you have received this communication in error, please not=
ify the sender by reply transmission and delete the message without copying=
 or disclosing it.

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