Received: from maia.hub.org (maia-3.hub.org [200.46.204.243]) by mail.postgresql.org (Postfix) with ESMTP id 57C33B5DC57 for ; Fri, 9 Sep 2011 17:30:04 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.243]) (amavisd-maia, port 10024) with ESMTP id 00195-09 for ; Fri, 9 Sep 2011 20:29:56 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from gw.wicourts.gov (gwmta.wicourts.gov [165.219.244.99]) by mail.postgresql.org (Postfix) with ESMTP id C1564B5DC14 for ; Fri, 9 Sep 2011 17:29:55 -0300 (ADT) Received: from Courts-MTA by gw.wicourts.gov with Novell_GroupWise; Fri, 09 Sep 2011 15:29:55 -0500 Message-Id: <4E6A30EC0200002500041075@gw.wicourts.gov> X-Mailer: Novell GroupWise Internet Agent 8.0.1 Date: Fri, 09 Sep 2011 15:29:48 -0500 From: "Kevin Grittner" To: "Antonio Rodriges" Cc: Subject: Re: PostgreSQL insights: does it use DMA? References: In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-2.404 tagged_above=-10 required=5 tests=BAYES_00=-1.9, RP_MATCHES_RCVD=-0.504 X-Spam-Level: X-Archive-Number: 201109/94 X-Sequence-Number: 44870 Antonio Rodriges wrote: > PostgreSQL is implemented mostly in C, so I do not know whether it > needs to use special procedure calls, however this is true, for > example, for Java > http://www.ibm.com/developerworks/library/j-zerocopy/ After scanning that I'm inclined to think that the only place that zerocopy techniques might make sense is in the context of BLOBs. That's not currently happening, and not on anyone's radar as far as I know. -Kevin