From owner-freebsd-questions Wed May 29 21: 3:35 2002 Delivered-To: freebsd-questions@freebsd.org Received: from altair.mukappabeta.net (altair.mukappabeta.net [194.145.150.157]) by hub.freebsd.org (Postfix) with ESMTP id 7CF7237B407 for ; Wed, 29 May 2002 21:03:30 -0700 (PDT) Received: by altair.mukappabeta.net (Postfix, from userid 1001) id 3D9D06BF; Thu, 30 May 2002 06:03:58 +0200 (CEST) Date: Thu, 30 May 2002 06:03:58 +0200 From: Matthias Buelow To: Kirk Strauser Cc: freebsd-questions@freebsd.org Subject: Re: mv vs. tar [overlapping] Message-ID: <20020530040358.GA1262@altair.mukappabeta.net> References: <20020530022609.GA956@altair.mukappabeta.net> <20020529223005.O79882-100000@earl-grey.cloud9.net> <20020530030413.GA1063@altair.mukappabeta.net> <87bsayjouu.fsf@pooh.int> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87bsayjouu.fsf@pooh.int> User-Agent: Mutt/1.3.28i Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Kirk Strauser writes: [not much difference between 1 process doing sequential read/write, and 2 processes, one reading from disk, other writing] >That's assuming that 1) the source and destination are on the same drive, >and 2) the filesystem(s) in question aren't on RAID volumes. In either of >those cases, parallelizing transfers will certainly increase performance. But will the sending process be able to write to the pipe when it's locked up by reading from disk, and will the receiving process be able to read from the pipe, when it's locked up writing to (possibly a different) disk? The whole issue will get serialized again. --mkb To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message