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 386FA7745 for ; Tue, 20 Sep 2011 13:27:22 +0000 (UTC) Received: (qmail 89779 invoked by uid 500); 20 Sep 2011 13:27:20 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 89749 invoked by uid 500); 20 Sep 2011 13:27:19 -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 89740 invoked by uid 99); 20 Sep 2011 13:27:19 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 20 Sep 2011 13:27:19 +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 jbellis@gmail.com designates 209.85.215.43 as permitted sender) Received: from [209.85.215.43] (HELO mail-ew0-f43.google.com) (209.85.215.43) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 20 Sep 2011 13:27:15 +0000 Received: by ewy9 with SMTP id 9so241092ewy.30 for ; Tue, 20 Sep 2011 06:26:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type:content-transfer-encoding; bh=kiZUNBLFU/yj/FhFDl3iycZQtrSykvFU8AYq4LeGix4=; b=Hdjpw66icmlESTDHFrk5iNO6LxMYPpI1sSZpnyoOjf8+Z6BAV6cFE6T7qYZZbVOdWe baAMmONhbOLZjvibYoKlWNMGOi7ZOYGYTk3teQ2K6gHyVZ/27PoNKFqIj+7/Q5+VQaL3 /ZezyPaLhlugwnn0Q9IfvHe4WC9o9xUWvvk6s= Received: by 10.213.9.148 with SMTP id l20mr195310ebl.63.1316525214213; Tue, 20 Sep 2011 06:26:54 -0700 (PDT) MIME-Version: 1.0 Received: by 10.213.16.193 with HTTP; Tue, 20 Sep 2011 06:26:34 -0700 (PDT) In-Reply-To: References: From: Jonathan Ellis Date: Tue, 20 Sep 2011 08:26:34 -0500 Message-ID: Subject: Re: Setting java heap size for Cassandra process To: user@cassandra.apache.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable wiki.apache.org/cassandra/FAQ#mmap On Tue, Sep 20, 2011 at 8:12 AM, Evgeniy Ryabitskiy wrote: > Hi, > I am running Cassandra over Linux VMs, each VM is: 2GB RAM, 4 core CPU. > Using RPM distribution. I have set -Xmx to 512M in cassandra-env.sh > > After day of running I see that Cassandra process is utilizing over 80% o= f > memory that is 3 times more then 512M. > In result after 2 days of running, Cassandra process is killed by OS > (without OutOfMemoryException). > > Here is ps aux output. Could you help to understand this behavior? > > > USER=A0=A0=A0=A0=A0=A0 PID %CPU %MEM=A0=A0=A0 VSZ=A0=A0=A0=A0=A0=A0=A0=A0= RSS=A0=A0=A0=A0=A0=A0 TTY=A0=A0 STAT=A0=A0=A0 START=A0=A0 TIME > COMMAND > 103=A0=A0=A0=A0=A0 =A0 =A0 1067=A0 2.5=A0=A0=A0=A0=A0=A0 80.7=A0=A0=A0 64= 17932=A0=A0=A0 1693508=A0=A0=A0 ? > SLl=A0=A0=A0=A0=A0=A0=A0=A0=A0 01:06 =A0 =A0=A0 24:30=A0 /usr/java/jre1.6= .0_26/bin/java -ea > -javaagent:/usr/share/cassandra//lib/jamm-0.2.2.jar -XX:+UseThreadPriorit= ies > -XX:ThreadPriorityPolicy=3D42 -Xms512M -Xmx512M -Xmn128M > -XX:+HeapDumpOnOutOfMemoryError -Xss128k -XX:+UseParNewGC > -XX:+UseConcMarkSweepGC -XX:+CMSParallelRemarkEnabled -XX:SurvivorRatio= =3D8 > -XX:MaxTenuringThreshold=3D1 -XX:CMSInitiatingOccupancyFraction=3D75 > -XX:+UseCMSInitiatingOccupancyOnly -Djava.net.preferIPv4Stack=3Dtrue > -Dcom.sun.management.jmxremote.port=3D7199 > -Dcom.sun.management.jmxremote.ssl=3Dfalse > -Dcom.sun.management.jmxremote.authenticate=3Dfalse > -Dlog4j.configuration=3Dlog4j-server.properties > -Dlog4j.defaultInitOverride=3Dtrue > -Dcassandra-pidfile=3D/var/run/cassandra/cassandra.pid -cp > /etc/cassandra/conf:/usr/share/cassandra/lib/antlr-3.2.jar:/usr/share/cas= sandra/lib/apache-cassandra-0.8.5.jar:/usr/share/cassandra/lib/apache-cassa= ndra-thrift-0.8.5.jar:/usr/share/cassandra/lib/avro-1.4.0-fixes.jar:/usr/sh= are/cassandra/lib/avro-1.4.0-sources-fixes.jar:/usr/share/cassandra/lib/com= mons-cli-1.1.jar:/usr/share/cassandra/lib/commons-codec-1.2.jar:/usr/share/= cassandra/lib/commons-collections-3.2.1.jar:/usr/share/cassandra/lib/common= s-lang-2.4.jar:/usr/share/cassandra/lib/concurrentlinkedhashmap-lru-1.1.jar= :/usr/share/cassandra/lib/guava-r08.jar:/usr/share/cassandra/lib/high-scale= -lib-1.1.2.jar:/usr/share/cassandra/lib/jackson-core-asl-1.4.0.jar:/usr/sha= re/cassandra/lib/jackson-mapper-asl-1.4.0.jar:/usr/share/cassandra/lib/jamm= -0.2.2.jar:/usr/share/cassandra/lib/jline-0.9.94.jar:/usr/share/cassandra/l= ib/jna.jar:/usr/share/cassandra/lib/json-simple-1.1.jar:/usr/share/cassandr= a/lib/libthrift-0.6.jar:/usr/share/cassandra/lib/log4j-1.2.16.jar:/usr/shar= e/cassandra/lib/servlet-api-2.5-20081211.jar:/usr/share/cassandra/lib/slf4j= -api-1.6.1.jar:/usr/share/cassandra/lib/slf4j-log4j12-1.6.1.jar:/usr/share/= cassandra/lib/snakeyaml-1.6.jar > org.apache.cassandra.thrift.CassandraDaemon > > > Evgeny. > > --=20 Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com