Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 35508 invoked from network); 27 Aug 2010 07:01:41 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 27 Aug 2010 07:01:41 -0000 Received: (qmail 81931 invoked by uid 500); 27 Aug 2010 07:01:39 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 81703 invoked by uid 500); 27 Aug 2010 07:01:36 -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 81693 invoked by uid 99); 27 Aug 2010 07:01:35 -0000 Received: from Unknown (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 27 Aug 2010 07:01:35 +0000 X-ASF-Spam-Status: No, hits=0.7 required=10.0 tests=RCVD_IN_DNSWL_NONE,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [74.125.82.44] (HELO mail-ww0-f44.google.com) (74.125.82.44) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 27 Aug 2010 07:01:14 +0000 Received: by wwb28 with SMTP id 28so2889075wwb.25 for ; Fri, 27 Aug 2010 00:00:52 -0700 (PDT) Received: by 10.216.5.21 with SMTP id 21mr355985wek.20.1282892452339; Fri, 27 Aug 2010 00:00:52 -0700 (PDT) MIME-Version: 1.0 Received: by 10.216.3.129 with HTTP; Fri, 27 Aug 2010 00:00:32 -0700 (PDT) In-Reply-To: References: <4C73E568.4030704@cs.tu-berlin.de> From: Benjamin Black Date: Fri, 27 Aug 2010 00:00:32 -0700 Message-ID: Subject: Re: Follow-up post on cassandra configuration with some experiments on GC tuning To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Checked: Checked by ClamAV on apache.org Any reason not to add the incremental mode settings? It's unusual to see a Cassandra node out of CPU, but wild heap oscillations are pretty common. On Thu, Aug 26, 2010 at 8:54 PM, Jonathan Ellis wrote: > added CMSInitiatingOccupancyFraction=3D80 for 0.6.6 and 0.7beta2 > > On Thu, Aug 26, 2010 at 9:57 PM, Benjamin Black wrote: >> imo, these should be part of the defaults. >> >> On Tue, Aug 24, 2010 at 8:29 AM, Mikio Braun wro= te: >>> -----BEGIN PGP SIGNED MESSAGE----- >>> Hash: SHA1 >>> >>> Dear all, >>> >>> thanks again for all the comments I got on my last post. I've played a >>> bit with different GC settings and got my Cassandra instance to run >>> very nicely with 8GB of heap. >>> >>> I summarized my experiences with GC tuning in this follow-up post: >>> >>> http://blog.mikiobraun.de/2010/08/cassandra-gc-tuning.html >>> >>> - -M >>> >>> - -- >>> Dr. Mikio Braun =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0email: m= ikio@cs.tu-berlin.de >>> TU Berlin =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0we= b: ml.cs.tu-berlin.de/~mikio >>> Franklinstr. 28/29 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 tel: +49 30 = 314 78627 >>> 10587 Berlin, Germany >>> >>> >>> >>> -----BEGIN PGP SIGNATURE----- >>> Version: GnuPG v1.4.9 (GNU/Linux) >>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ >>> >>> iEYEARECAAYFAkxz5WcACgkQtnXKX8rQtgDiiwCeLknuTcr65eehwIcsivInjv4W >>> LaQAn3RY9pH19r8SuUhVBvtE6LeyFUvB >>> =3DMYsY >>> -----END PGP SIGNATURE----- >>> >> > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com >