Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 23422 invoked from network); 4 Aug 2010 02:23:04 -0000 Received: from unknown (HELO mail.apache.org) (140.211.11.3) by 140.211.11.9 with SMTP; 4 Aug 2010 02:23:04 -0000 Received: (qmail 63867 invoked by uid 500); 4 Aug 2010 02:23:03 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 63819 invoked by uid 500); 4 Aug 2010 02:23:02 -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 63811 invoked by uid 99); 4 Aug 2010 02:23:02 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 04 Aug 2010 02:23:02 +0000 X-ASF-Spam-Status: No, hits=2.2 required=10.0 tests=FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of dathanvp@gmail.com designates 74.125.83.172 as permitted sender) Received: from [74.125.83.172] (HELO mail-pv0-f172.google.com) (74.125.83.172) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 04 Aug 2010 02:22:57 +0000 Received: by pvd12 with SMTP id 12so2092702pvd.31 for ; Tue, 03 Aug 2010 19:22:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=2CRQkLw2OwNcfJtSDXqmUoOYUpMb0wroUzPFAT31TL4=; b=VMLt+VROoO7reyqZbHmQv3mkG4IqGP0vzjhpEBSSpgSurditY8j8bUbrYQf65cvzAG cFJpV+vz+Zwyu/TZUYApVXnJeBM3F+psQAf586zsTce3MWVjGA6UdfMeuHB0Q5pxHdIV DOJ9SSOCZmffTzyzWgfqkj1tNFVD5dsfph+8I= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=f5cw14zQrGPtCvp+K3FFnLwuKTvqcr9UJIJq/saxaH+5tZCdnGz4ijdQgM3Qo9GX8j fWCjFqVBcOavMZgTJjnhym3jnf0HCuvlLBlTCur68/FaNt1T1MvkS+8Gvob7oXjyV6MV Aj5doWrA95VJiBKZ/EiW4jcamsHe+fSPY148s= MIME-Version: 1.0 Received: by 10.142.230.3 with SMTP id c3mr3192155wfh.237.1280888556934; Tue, 03 Aug 2010 19:22:36 -0700 (PDT) Received: by 10.142.224.1 with HTTP; Tue, 3 Aug 2010 19:22:36 -0700 (PDT) In-Reply-To: References: Date: Tue, 3 Aug 2010 19:22:36 -0700 Message-ID: Subject: Re: what is the expected result of changing this in storage.conf From: Dathan Pattishall To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=000e0cd32c8c6ed792048cf61b17 --000e0cd32c8c6ed792048cf61b17 Content-Type: text/plain; charset=ISO-8859-1 Thanks for the link but that doesn't answer my question. I happen to know quite allot about tuning Linux/Solaris/*NIX. I'm trying to figure out the limits in cassandra, when it breaks, and why. So, anyone know of or published benchmarks on messing with these values? On Tue, Aug 3, 2010 at 7:08 PM, Jonathan Ellis wrote: > You need to find out where your bottleneck is, before you start trying > to mitigate it. Some good first steps are at > http://spyced.blogspot.com/2010/01/linux-performance-basics.html > > On Tue, Aug 3, 2010 at 9:03 PM, Dathan Pattishall > wrote: > > Do reads at high concurrency get a boost if I where to raise this value? > > > > 8 > > 32 > > > > Any benchmarks/reports showing a good sweet spot per CPU core? > > > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com > --000e0cd32c8c6ed792048cf61b17 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks for the link but that doesn't answer my question. I happen to kn= ow quite allot about tuning Linux/Solaris/*NIX. I'm trying to figure ou= t the limits in cassandra, when it breaks, and why.

So, anyone know= of or published benchmarks on messing with these values?

On Tue, Aug 3, 2010 at 7:08 PM, Jonathan Ellis <jbellis@gmail.com><= /span> wrote:
You need to find out where your bottleneck is, before you start trying
to mitigate it. =A0Some good first steps are at
http://spyced.blogspot.com/2010/01/linux-performance-ba= sics.html

On Tue, Aug 3, 2010 at 9:03 PM, Dathan Pattishall <dathanvp@gmail.com> wrote:
> Do reads at high concurrency get a boost if I where to raise this valu= e?
>
> =A0 <ConcurrentReads>8</ConcurrentReads>
> =A0 <ConcurrentWrites>32</ConcurrentWrites>
>
> Any benchmarks/reports showing a good sweet spot per CPU core?
>



--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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