From user-return-35419-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Fri Jul 19 17:06:00 2013 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 70A84C976 for ; Fri, 19 Jul 2013 17:06:00 +0000 (UTC) Received: (qmail 18239 invoked by uid 500); 19 Jul 2013 17:05:57 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 18228 invoked by uid 500); 19 Jul 2013 17:05:57 -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 18217 invoked by uid 99); 19 Jul 2013 17:05:57 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 19 Jul 2013 17:05:57 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of kanwar@mavenir.com designates 206.225.165.117 as permitted sender) Received: from [206.225.165.117] (HELO HUB024-nj-2.exch024.serverdata.net) (206.225.165.117) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 19 Jul 2013 17:05:51 +0000 Received: from MBX024-E1-NJ-6.exch024.domain.local ([10.240.10.56]) by HUB024-NJ-2.exch024.domain.local ([10.240.10.33]) with mapi id 14.03.0123.003; Fri, 19 Jul 2013 10:05:26 -0700 From: Kanwar Sangha To: "user@cassandra.apache.org" Subject: CPU Bound Writes Thread-Topic: CPU Bound Writes Thread-Index: Ac6Eod+aTGqdTTtXSdmgt5miqx6NTw== Date: Fri, 19 Jul 2013 17:05:26 +0000 Message-ID: <57C7C3CBDCB04F45A57AEC4CB21C0CCD1DBDEEB0@mbx024-e1-nj-6.exch024.domain.local> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [38.122.186.90] Content-Type: multipart/alternative; boundary="_000_57C7C3CBDCB04F45A57AEC4CB21C0CCD1DBDEEB0mbx024e1nj6exch_" MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org --_000_57C7C3CBDCB04F45A57AEC4CB21C0CCD1DBDEEB0mbx024e1nj6exch_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable "Insert-heavy workloads will actually be CPU-bound in Cassandra before bein= g memory-bound" Can someone explain why the internals of why writes are CPU bound ? --_000_57C7C3CBDCB04F45A57AEC4CB21C0CCD1DBDEEB0mbx024e1nj6exch_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

“Insert-heavy workloads w= ill actually be CPU-bound in Cassandra before being memory-bound”

 

Can someone explain why the int= ernals of why writes are CPU bound ?

 

 

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