X-Original-To: pgsql-performance-postgresql.org@postgresql.org Received: from localhost (wm.hub.org [200.46.204.128]) by postgresql.org (Postfix) with ESMTP id 5FF129FB2FA for ; Thu, 31 Aug 2006 14:06:46 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.128]) (amavisd-new, port 10024) with ESMTP id 98047-10 for ; Thu, 31 Aug 2006 17:06:43 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey- Received: from wr-out-0506.google.com (wr-out-0506.google.com [64.233.184.227]) by postgresql.org (Postfix) with ESMTP id 6E5219FB210 for ; Thu, 31 Aug 2006 14:06:30 -0300 (ADT) Received: by wr-out-0506.google.com with SMTP id i32so266203wra for ; Thu, 31 Aug 2006 10:06:29 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=uSS3vQSJx721ik2FzEaW3QsbZi0nWdvliZ68on/A9dvXib0AvwROUKlWJtRfWFGKluWUk/unow+4C2WiwvZrLe0hYOuLAVDFeNjglz3+N5zW12BXA7nN1BVFA2r1qb701Sah4i4dn3aDWfrFi7zsPy8dujmpBC4Z+u9fzdiVqkA= Received: by 10.90.106.18 with SMTP id e18mr264158agc; Thu, 31 Aug 2006 10:06:29 -0700 (PDT) Received: by 10.90.27.1 with HTTP; Thu, 31 Aug 2006 10:06:29 -0700 (PDT) Message-ID: <1d4e0c10608311006n259e2fabm5d70b420040ea2e0@mail.gmail.com> Date: Thu, 31 Aug 2006 19:06:29 +0200 From: "Guillaume Smet" To: "Cosimo Streppone" Subject: Re: High concurrency OLTP database performance tuning Cc: "Pg Performance list" In-Reply-To: <44F7040E.7040805@streppone.it> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <44F7040E.7040805@streppone.it> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.199 tagged_above=0 required=5 tests=DNS_FROM_RFC_ABUSE, SPF_PASS X-Spam-Level: X-Archive-Number: 200608/489 X-Sequence-Number: 20674 Cosimo, On 8/31/06, Cosimo Streppone wrote: > The problem is that under peak load, when n. of concurrent transactions > raises, there is a sensible performance degradation. Could you give us more information about the performance degradation? Especially cpu load/iostat/vmstat data when the problem occurs can be interesting. -- Guillaume