Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 38152 invoked from network); 18 Jun 2010 17:43:11 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 18 Jun 2010 17:43:11 -0000 Received: (qmail 75328 invoked by uid 500); 18 Jun 2010 17:43:10 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 75293 invoked by uid 500); 18 Jun 2010 17:43:09 -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 75285 invoked by uid 99); 18 Jun 2010 17:43:09 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 18 Jun 2010 17:43:09 +0000 X-ASF-Spam-Status: No, hits=0.4 required=10.0 tests=AWL,RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: local policy) Received: from [209.85.211.190] (HELO mail-yw0-f190.google.com) (209.85.211.190) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 18 Jun 2010 17:43:04 +0000 Received: by ywh28 with SMTP id 28so1335322ywh.28 for ; Fri, 18 Jun 2010 10:42:41 -0700 (PDT) MIME-Version: 1.0 Received: by 10.229.187.135 with SMTP id cw7mr756566qcb.15.1276882961315; Fri, 18 Jun 2010 10:42:41 -0700 (PDT) Received: by 10.229.91.139 with HTTP; Fri, 18 Jun 2010 10:42:41 -0700 (PDT) In-Reply-To: References: Date: Fri, 18 Jun 2010 10:42:41 -0700 Message-ID: Subject: Re: ec2 tests From: Benjamin Black To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Fri, Jun 18, 2010 at 8:00 AM, Olivier Mallassi wrot= e: > I use the default conf settings (Xmx 1G, concurrentwrite 32...) except fo= r > commitlog and DataFileDirectory :=A0I have a raid0 EBS for commit log and > another raid0 EBS for data. > I can't get through 7500 write/sec (when launching 4 stress.py in the sam= e > time). > Moreover I can see some pending tasks in the > org.cassandra.db.ColumnFamilyStores.Keyspace1.Standard1 MBean > Any ideas on the bottleneck? Your instance has 7.5G of RAM, but you are limiting Cassandra to 1G. Increase -Xmx to 4G for a start. You are likely to get significantly better performance with the ephemeral drive, as well. I suggest testing with commitlog on the ephemeral drive for comparison. b