it can reduce memory usage. for small heap application less than 4GB, it may speed up. but be careful, for large heap application, it depends. you should do some test for yourself. our application's test result is: it reduce memory usage but enlarge response time. we use 25GB memory.
http://lists.apple.com/archives/java-dev/2010/Apr/msg00157.html Dyer, James james.d...@ingrambook.com via<http://support.google.com/mail/bin/answer.py?hl=en&ctx=mail&answer=1311182> lucene.apache.org 3/18/11 to solr-user Our tests showed, in our situation, the "compressed oops" flag caused our minor (ParNew) generation time to decrease significantly. We're using a larger heap (22gb) and our index size is somewhere in the 40's gb total. I guess with any of these jvm parameters, it all depends on your situation and you need to test. In our case, this flag solved a real problem we were having. Whoever wrote the JRocket book you refer to no doubt had other scenarios in mind... On Thu, Mar 15, 2012 at 3:02 PM, C.Yunqin <345804...@qq.com> wrote: > why should enable pointer compression? > > > > > ------------------ Original ------------------ > From: "Li Li"<fancye...@gmail.com>; > Date: Thu, Mar 15, 2012 02:41 PM > To: "Husain, Yavar"<yhus...@firstam.com>; > Cc: "solr-user@lucene.apache.org"<solr-user@lucene.apache.org>; > Subject: Re: Solr out of memory exception > > > it seems you are using 64bit jvm(32bit jvm can only allocate about 1.5GB). > you should enable pointer compression by -XX:+UseCompressedOops > > On Thu, Mar 15, 2012 at 1:58 PM, Husain, Yavar <yhus...@firstam.com> > wrote: > > > Thanks for helping me out. > > > > I have allocated Xms-2.0GB Xmx-2.0GB > > > > However i see Tomcat is still using pretty less memory and not 2.0G > > > > Total Memory on my Windows Machine = 4GB. > > > > With smaller index size it is working perfectly fine. I was thinking of > > increasing the system RAM & tomcat heap space allocated but then how come > > on a different server with exactly same system and solr configuration & > > memory it is working fine? > > > > > > -----Original Message----- > > From: Li Li [mailto:fancye...@gmail.com] > > Sent: Thursday, March 15, 2012 11:11 AM > > To: solr-user@lucene.apache.org > > Subject: Re: Solr out of memory exception > > > > how many memory are allocated to JVM? > > > > On Thu, Mar 15, 2012 at 1:27 PM, Husain, Yavar <yhus...@firstam.com> > > wrote: > > > > > Solr is giving out of memory exception. Full Indexing was completed > fine. > > > Later while searching maybe when it tries to load the results in memory > > it > > > starts giving this exception. Though with the same memory allocated to > > > Tomcat and exactly same solr replica on another server it is working > > > perfectly fine. I am working on 64 bit software's including Java & > Tomcat > > > on Windows. > > > Any help would be appreciated. > > > > > > Here are the logs: > > > > > > The server encountered an internal error (Severe errors in solr > > > configuration. Check your log files for more detailed information on > what > > > may be wrong. If you want solr to continue after configuration errors, > > > change: <abortOnConfigurationError>false</abortOnConfigurationError> in > > > null ------------------------------------------------------------- > > > java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space > > at > > > org.apache.solr.core.SolrCore.getSearcher(SolrCore.java:1068) at > > > org.apache.solr.core.SolrCore.<init>(SolrCore.java:579) at > > > > > > org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:137) > > > at > > > > > > org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:83) > > > at > > > > > > org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295) > > > at > > > > > > org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422) > > > at > > > > > > org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115) > > > at > > > > > > org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4072) > > > at > > > > org.apache.catalina.core.StandardContext.start(StandardContext.java:4726) > > > at > > > > > > org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799) > > > at > > org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779) > > > at > org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601) > > at > > > org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943) > at > > > org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778) > at > > > org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504) > at > > > org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317) at > > > > > > org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324) > > > at > > > > > > org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) > > > at > org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065) > > at > > > org.apache.catalina.core.StandardHost.start(StandardHost.java:840) at > > > org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057) > at > > > org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463) > at > > > > org.apache.catalina.core.StandardService.start(StandardService.java:525) > > at > > > org.apache.catalina.core.StandardServer.start(StandardServer.java:754) > at > > > org.apache.catalina.startup.Catalina.start(Catalina.java:595) at > > > sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at > > > sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at > > > sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at > > > java.lang.reflect.Method.invoke(Unknown Source) at > > > org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at > > > org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Caused > by: > > > java.lang.OutOfMemoryError: Java heap space at > > > > > > org.apache.lucene.index.SegmentTermEnum.termInfo(SegmentTermEnum.java:180) > > > at > > org.apache.lucene.index.TermInfosReader.<init>(TermInfosReader.java:91) > > > at > > > > > > org.apache.lucene.index.SegmentReader$CoreReaders.<init>(SegmentReader.java:122) > > > at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:652) at > > > org.apache.lucene.index.SegmentReader.get(SegmentReader.java:613) at > > > > org.apache.lucene.index.DirectoryReader.<init>(DirectoryReader.java:104) > > at > > > > > > org.apache.lucene.index.ReadOnlyDirectoryReader.<init>(ReadOnlyDirectoryReader.java:27) > > > at > > > > org.apache.lucene.index.DirectoryReader$1.doBody(DirectoryReader.java:74) > > > at > > > > > > org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:683) > > > at > org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:69) > > at > > > org.apache.lucene.index.IndexReader.open(IndexReader.java:476) at > > > org.apache.lucene.index.IndexReader.open(IndexReader.java:403) at > > > > > > org.apache.solr.core.StandardIndexReaderFactory.newReader(StandardIndexReaderFactory.java:38) > > > at org.apache.solr.core.SolrCore.getSearcher(SolrCore.java:1057) at > > > org.apache.solr.core.SolrCore.<init>(SolrCore.java:579) at > > > > > > org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:137) > > > at > > > > > > org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:83) > > > at > > > > > > org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295) > > > at > > > > > > org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422) > > > at > > > > > > org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115) > > > at > > > > > > org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4072) > > > at > > > > org.apache.catalina.core.StandardContext.start(StandardContext.java:4726) > > > at > > > > > > org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799) > > > at > > org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779) > > > at > org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601) > > at > > > org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943) > at > > > org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778) > at > > > org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504) > at > > > org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317) at > > > > > > org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324) > > > at > > > > > > org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) > > > at > org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065) > > ) > > > that prevented it from fulfilling this request. > > > </PRE> > > > <BR> > > > > > > ******************************************************************************************<BR>This > > > message may contain confidential or proprietary information intended > only > > > for the use of the<BR>addressee(s) named above or may contain > information > > > that is legally privileged. 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