Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 29320 invoked from network); 13 Jul 2010 02:01:53 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 13 Jul 2010 02:01:53 -0000 Received: (qmail 47070 invoked by uid 500); 13 Jul 2010 02:01:52 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 47019 invoked by uid 500); 13 Jul 2010 02:01:51 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 47011 invoked by uid 99); 13 Jul 2010 02:01:51 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 13 Jul 2010 02:01:51 +0000 X-ASF-Spam-Status: No, hits=2.9 required=10.0 tests=HTML_MESSAGE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [209.85.161.172] (HELO mail-gx0-f172.google.com) (209.85.161.172) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 13 Jul 2010 02:01:44 +0000 Received: by gxk3 with SMTP id 3so3307864gxk.31 for ; Mon, 12 Jul 2010 19:00:33 -0700 (PDT) Received: by 10.150.31.15 with SMTP id e15mr3419637ybe.216.1278986432950; Mon, 12 Jul 2010 19:00:32 -0700 (PDT) Received: from mail-gx0-f172.google.com (mail-gx0-f172.google.com [209.85.161.172]) by mx.google.com with ESMTPS id m13sm4173485ybn.9.2010.07.12.19.00.32 (version=SSLv3 cipher=RC4-MD5); Mon, 12 Jul 2010 19:00:32 -0700 (PDT) Received: by gxk3 with SMTP id 3so3307854gxk.31 for ; Mon, 12 Jul 2010 19:00:31 -0700 (PDT) MIME-Version: 1.0 Received: by 10.150.170.2 with SMTP id s2mr5911931ybe.305.1278986431815; Mon, 12 Jul 2010 19:00:31 -0700 (PDT) Received: by 10.151.13.21 with HTTP; Mon, 12 Jul 2010 19:00:31 -0700 (PDT) Date: Mon, 12 Jul 2010 21:00:31 -0500 Message-ID: Subject: concurrent reads From: Lee Parker To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=000e0cd39c7af0e4c3048b3b3b79 X-Virus-Checked: Checked by ClamAV on apache.org --000e0cd39c7af0e4c3048b3b3b79 Content-Type: text/plain; charset=ISO-8859-1 Has anyone experimented with different settings for concurrent reads? I have set our servers to 4 ( 2 per processor core ). I have noticed that occasionally, our pending reads will get backed up and our servers don't appear to be under too much load. In fact, most of the load appears to be from GC. Is 3 per processor core too much? Does it matter if it is an AMC vs Intel processor? How does processor clock speed or cache play into this setting? Lee Parker --000e0cd39c7af0e4c3048b3b3b79 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Has anyone experimented with different settings for concurrent reads? =A0I = have set our servers to 4 ( 2 per processor core ). =A0I have noticed that = occasionally, our pending reads will get backed up and our servers don'= t appear to be under too much load. =A0In fact, most of the load appears to= be from GC. =A0Is 3 per processor core too much? =A0Does it matter if it i= s an AMC vs Intel processor? =A0How does processor clock speed or cache pla= y into this setting?

Lee Parker

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