Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 004596501F9 for ; Sun, 24 Aug 2008 22:50:48 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 46919-03-3 for ; Sun, 24 Aug 2008 22:50:34 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id BC593650215 for ; Sun, 24 Aug 2008 22:49:55 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m7P1np6g001029; Sun, 24 Aug 2008 21:49:51 -0400 (EDT) To: "Scott Carey" cc: "Craig Ringer" , "Peter Schuller" , pgsql-performance@postgresql.org Subject: Re: Identifying the nature of blocking I/O In-reply-to: References: <20080822115243.GA10981@hyperion.scode.org> <48B1FD1A.7040807@postnewspapers.com.au> Comments: In-reply-to "Scott Carey" message dated "Sun, 24 Aug 2008 18:34:18 -0700" Date: Sun, 24 Aug 2008 21:49:51 -0400 Message-ID: <1028.1219628991@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200808/317 X-Sequence-Number: 31198 "Scott Carey" writes: > DTrace is available now on MacOSX, Solaris 10, OpenSolaris, and FreeBSD. > Linux however is still in the dark ages when it comes to system monitoring, > especially with I/O. Oh, after poking around a bit, I should note that some of my Red Hat compatriots think that "systemtap" is the long-term Linux answer here. I know zip about it myself, but it's something to read up on if you are looking for better performance monitoring on Linux. regards, tom lane