Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id C5B3B10757 for ; Sun, 21 Jul 2013 20:58:57 +0000 (UTC) Received: (qmail 11684 invoked by uid 500); 21 Jul 2013 20:58:55 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 11651 invoked by uid 500); 21 Jul 2013 20:58:55 -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 11643 invoked by uid 500); 21 Jul 2013 20:58:55 -0000 Delivered-To: apmail-incubator-cassandra-user@incubator.apache.org Received: (qmail 11640 invoked by uid 99); 21 Jul 2013 20:58:55 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 21 Jul 2013 20:58:55 +0000 X-ASF-Spam-Status: No, hits=1.3 required=5.0 tests=URI_HEX X-Spam-Check-By: apache.org Received-SPF: error (athena.apache.org: local policy) Received: from [216.139.236.26] (HELO sam.nabble.com) (216.139.236.26) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 21 Jul 2013 20:58:51 +0000 Received: from jim.nabble.com ([192.168.236.80]) by sam.nabble.com with esmtp (Exim 4.72) (envelope-from ) id 1V10hm-0003UM-EM for cassandra-user@incubator.apache.org; Sun, 21 Jul 2013 13:58:10 -0700 Date: Sun, 21 Jul 2013 13:58:10 -0700 (PDT) From: hajjat To: cassandra-user@incubator.apache.org Message-ID: <1374440290435-7589191.post@n2.nabble.com> Subject: Are Writes disk-bound rather than CPU-bound? MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Virus-Checked: Checked by ClamAV on apache.org =E2=80=9C/Insert-heavy workloads will actually be CPU-bound in Cassandra be= fore being memory-bound/=E2=80=9D However, from reading the documentation (http://www.datastax.com/docs/1.2/dml/about_writes) it seems the disk is th= e real bottleneck in Writes rather than the CPU. This is because everything i= s *first *written to the commit log *on disk*. Any thoughts?? -- View this message in context: http://cassandra-user-incubator-apache-org.30= 65146.n2.nabble.com/Are-Writes-disk-bound-rather-than-CPU-bound-tp7589191.h= tml Sent from the cassandra-user@incubator.apache.org mailing list archive at N= abble.com.