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 245877004 for ; Mon, 26 Sep 2011 13:33:16 +0000 (UTC) Received: (qmail 63987 invoked by uid 500); 26 Sep 2011 13:33:14 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 63954 invoked by uid 500); 26 Sep 2011 13:33:14 -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 63946 invoked by uid 99); 26 Sep 2011 13:33:14 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 26 Sep 2011 13:33:14 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of baskar.duraikannu.db@gmail.com designates 209.85.220.172 as permitted sender) Received: from [209.85.220.172] (HELO mail-vx0-f172.google.com) (209.85.220.172) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 26 Sep 2011 13:33:06 +0000 Received: by vcbfo11 with SMTP id fo11so3914713vcb.31 for ; Mon, 26 Sep 2011 06:32:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=from:content-type:content-transfer-encoding:subject:date:message-id :to:mime-version:x-mailer; bh=1AYyKATwBuUgsYNep3GrAur6bMrua0J6IP9uWnW7Trk=; b=JCdaXLJHQdOqpSFCZdVPP+esp4Bf4q/zNGG22n/r5OIeKGbOidGBSH2rsospTgadTE tmyBfJE9R7OCY1E7S7+cEWHrCxiCCdk5O+WGZnMuFFnVDwEGjwGls+kXy6l9xCxB7tQn 8NDsNPKtzSgyDgVr5j8nGZgG8h7dtYVx492c4= Received: by 10.52.70.14 with SMTP id i14mr1708854vdu.485.1317043965149; Mon, 26 Sep 2011 06:32:45 -0700 (PDT) Received: from bdmacbookpro.us.ad.irmc.com ([66.246.173.34]) by mx.google.com with ESMTPS id ed10sm12583320vdb.19.2011.09.26.06.32.44 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 26 Sep 2011 06:32:44 -0700 (PDT) From: Baskar Duraikannu Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Subject: Thrift CPU Usage Date: Mon, 26 Sep 2011 09:32:43 -0400 Message-Id: <4BE0A38A-E7C9-4E55-B4DC-05CD70E316DB@gmail.com> To: user@cassandra.apache.org Mime-Version: 1.0 (Apple Message framework v1244.3) X-Mailer: Apple Mail (2.1244.3) Hello -=20 I have been running read tests on Cassandra using "stress" tool. I have = been noticing that thrift seems to be taking lot of CPU over 70% when I = look at the "CPU samples" report. Is this normal? =20 CPU usage seems to go down by 5 to 10% when I change the RPC from "sync" = to "async". Is this normal?=20 I am running Cassandra 0.8.4 on Cent OS 5.6 ( Kernel 2.6.18.238) and = Oracle JVM.=20 -=20 Thanks Baskar Duraikannu=20=