From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 100745 invoked by alias); 4 Nov 2018 12:59:49 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 100707 invoked by uid 89); 4 Nov 2018 12:59:45 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=1.8 required=5.0 tests=BAYES_50,KAM_LAZY_DOMAIN_SECURITY,RCVD_IN_DNSWL_NONE autolearn=no version=3.3.2 spammy=H*UA:Opera, H*u:Opera, H*MI:localdomain, H*u:Win32 X-HELO: mailout07.t-online.de Received: from mailout07.t-online.de (HELO mailout07.t-online.de) (194.25.134.83) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Sun, 04 Nov 2018 12:59:44 +0000 Received: from fwd23.aul.t-online.de (fwd23.aul.t-online.de [172.20.26.128]) by mailout07.t-online.de (Postfix) with SMTP id C55714221A30 for ; Sun, 4 Nov 2018 13:59:41 +0100 (CET) Received: from orion.localdomain (GQHF5iZlQhAoAFPTY7oBlaq2al67Wjy00F3wKlbX65R3s5yefWbbHSXVb3QQdK-QJn@[188.192.132.121]) by fwd23.t-online.de with (TLSv1:DHE-RSA-AES256-SHA encrypted) esmtp id 1gJI07-16Bqwy0; Sun, 4 Nov 2018 13:59:35 +0100 Content-Type: text/plain; charset=windows-1252; format=flowed; delsp=yes Date: Sun, 04 Nov 2018 12:59:00 -0000 Subject: Local rsync disk to disk slow To: "cygwin@cygwin.com" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: "Michael Lemke" Message-ID: User-Agent: Opera Mail/10.63 (Win32) X-SW-Source: 2018-11/txt/msg00046.txt.bz2 I am copying a large directory tree from one internal disk to another USB 3 connected disk on the same computer with this rsync line: rsync -ahPvzHA --delete /d/Images /q/ This copies files at a rate of 20MB/s. If I copy the same tree with Windows Explorer I get about 90MB/s. Why is this? The chosen options don't seem to affect the result much. I noticed three rsync processes one of which is CPU bound at a single core and therefore limiting the performance. This process reads the source files. The other two rsync processes don't consume a noticable amount of CPU time and one of them writes the destination files. Are there any options to speed up the process? The reason I use rsync is to preserve hard links. -- 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