Return-Path: Delivered-To: apmail-incubator-cassandra-user-archive@minotaur.apache.org Received: (qmail 64099 invoked from network); 23 Feb 2010 17:35:55 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 23 Feb 2010 17:35:55 -0000 Received: (qmail 71281 invoked by uid 500); 23 Feb 2010 17:35:54 -0000 Delivered-To: apmail-incubator-cassandra-user-archive@incubator.apache.org Received: (qmail 71256 invoked by uid 500); 23 Feb 2010 17:35:54 -0000 Mailing-List: contact cassandra-user-help@incubator.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: cassandra-user@incubator.apache.org Delivered-To: mailing list cassandra-user@incubator.apache.org Received: (qmail 71247 invoked by uid 99); 23 Feb 2010 17:35:54 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 23 Feb 2010 17:35:54 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=10.0 tests=SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of jbellis@gmail.com designates 74.125.82.175 as permitted sender) Received: from [74.125.82.175] (HELO mail-wy0-f175.google.com) (74.125.82.175) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 23 Feb 2010 17:35:46 +0000 Received: by wyf28 with SMTP id 28so659047wyf.6 for ; Tue, 23 Feb 2010 09:35:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :from:date:message-id:subject:to:content-type :content-transfer-encoding; bh=+aiFlOscnexD8jBsvTQDI7Gw58tZh8I23SMcBbQLvwo=; b=PxKk0Qi/Vog73woRsrd3m6WljkFg7Or3Bb4DCGemCDR+MTxjFebaIuNTsAphgfLXSm +pBnOOX8reBgTOo9+Z5kiyyTQHowJQJDk0hgb3aCQWSepTQaSSImBqjkSAL9Pc5e8wkP s/fHSeviagDCr8vU+LosFguryXHN9Dlqfyg9I= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type:content-transfer-encoding; b=dtL85xqqSuuI+hQwi1tSTbZGAQ34Wfq4cDVGtz6FSOwF/r4+akFsEG4xh3FT57ZZiz boY1z6mkNMVs91VdBmNzoE5o8uSilSjN+YI/lZ5vo6USF+Rmvu47PEtch82F+FonPgoK EwmhHSk+yeqy5neAK9yFtVEpS1XKdy0MaBMKA= MIME-Version: 1.0 Received: by 10.216.88.143 with SMTP id a15mr1728885wef.6.1266946525753; Tue, 23 Feb 2010 09:35:25 -0800 (PST) In-Reply-To: References: From: Jonathan Ellis Date: Tue, 23 Feb 2010 11:35:05 -0600 Message-ID: Subject: Re: reads are slow To: cassandra-user@incubator.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Checked: Checked by ClamAV on apache.org are you i/o bound? http://spyced.blogspot.com/2010/01/linux-performance-basics.html On Tue, Feb 23, 2010 at 11:33 AM, kevin wrote: > to load 100 columns of a super column it takes over a second. how to impr= ove > this performance. > > > i am using cassandra 0.5 version. > > output of nodeprobe info > 29814395632524962303611017038378268216 > Load=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 : 9.18 GB > Generation No=A0=A0=A0 : 1266945238 > Uptime (seconds) : 638131 > Heap Memory (MB) : 47.55 / 10237.94 > > the full config file is here > http://pastie.org/838916 > > I have given 10GB RAM in cassandra.in.sh. > =A0=A0=A0=A0=A0=A0=A0 -Xmx10G \ > i have increased KeysCachedFraction to 0.04. i have two different drives = for > commitlog and data directoy. > i have about 3 million rows. > what can i do to improve read speed? > thanks a lot! >