we have JAVA_OPTS set in catalina.sh start_tomcat -> /usr/local/scripts/start_tomcat stop_tomcat -> /usr/local/tomcat/bin/shutdown.sh
MemTotal: 4149124 kB MemFree: 381644 kB Buffers: 106832 kB Cached: 2377208 kB SwapCached: 0 kB Active: 2646596 kB Inactive: 968884 kB HighTotal: 3276448 kB HighFree: 108160 kB LowTotal: 872676 kB LowFree: 273484 kB SwapTotal: 4194288 kB SwapFree: 4194064 kB Pid * wrote: > > On 11/11/2011 16:40, celtic man wrote: >> >> Is this JAVA setting below OK ? >> >> cat /proc/meminfo >> MemTotal: 4149124 kB >> MemFree: 457884 kB >> >> 4Gb total memory on the linux box and have 0.4GB free memory and >> tomcat(6.0.18) running with below : >> >> JAVA_OPTS=-Xmx2000M so that i.e 1.9GB ?? >> >> or please suggest me the best settings that i add and not have any memory >> leak issues on the application.. > > Please don't top-post. > > No-one can really answer the question you have asked, we don't know > enough about your application or how much memory it needs to use. > > We can only advise you to avoid bad configuration. Trying to assign 2Gb > to a Java process if the OS only has 0.5Gb free beforehand is bad > configuration. And maths, it's also Bad Maths. > > > > If you use JAVA_OPTS to set memory config, (as below), you will create a > JVM instance with 2Gb of RAM, if you are using the shutdown.sh script > which will run as well as the existing Tomcat instance. > > Both processes will end up using the swap, be horribly slow & probably > OOM. > > If you use CATALINA_OPTS, these values are not applied during shutdown > but are used during startup. > > > > You have 4Gb of physical RAM. The amount of memory you can use for > Tomcat is the amount of free RAM when Tomcat is not running. If your > server (without Tomcat) has 2Gb free, then Tomcat can use up to 2Gb. > > The -Xmx and -Xms settings apply to the Object Heap. The Object Heap is > only one part of the memory that a Java process consumes. (The Non-Heap > area includes the PermGen space, for example.) > > So, with 2Gb free RAM, you may be able to set -Xmx to 1.2Gb (this is a > guess, not a hard rule). > > You will have to test it yourself to determine what is safe. Use > VisualVM or JConsole (both are included with the JDK) to measure > heap/non-heap usage and compare it to the amount that the OS says the > process is using. > > > p > > >> Pid * wrote: >>> >>> On 10/11/2011 22:45, Igor Cicimov wrote: >>>>> >>>>> JAVA_OPTS=-Xms2048M -Xmx2048M -XX:Permsize=512m -XX:MaxPermsize=512m >>>>> >>>> >>>> You are allocating here 2.5GB of memory to tomcat ... how do you expect >>>> it >>>> to start on a box with 2GB in total of which only 500MB are available? >>> >>> +1 It's the perfect way to achieve shockingly bad performance. >>> >>> >>> p >>> >>> >>>> On Fri, Nov 11, 2011 at 8:25 AM, Christopher Schultz < >>>> ch...@christopherschultz.net> wrote: >>>> >>>> Celtic, >>>> >>>> On 11/10/11 12:02 PM, celtic man wrote: >>>>>>> So i have updated the setenv.sh with -Xms2048M -Xmx2048M >>>>>>> -XX:Permsize=512m -XX:MaxPermsize=512m and restarted tomcat.. >>>> >>>> Where is setenv.sh located? Can you give us the full contents of that >>>> file? >>>> >>>>>>> but when i grep for tomcat process i don't see it .. >>>>>>> >>>>>>> ps -ef | grep tomcat root 10959 1 19 14:57 pts/4 >>>>>>> 00:00:29 /appl/java/bin/java -Dnop >>>>>>> -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager >>>>>>> -Djava.endorsed.dirs=/appl/tomcat/endorsed -classpath >>>>>>> /appl/tomcat/bin/bootstrap.jar:/appl/tomcat/bin/tomcat-juli.jar >>>>>>> -Dcatalina.base=/appl/tomcat -Dcatalina.home=/appl/tomcat >>>>>>> -Djava.io.tmpdir=/appl/tomcat/temp >>>>>>> org.apache.catalina.startup.Bootstrap start >>>> >>>> How are you starting Tomcat? Give us the exact command you are running. >>>> >>>> -chris >>>>> >>>>> --------------------------------------------------------------------- >>>>> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >>>>> For additional commands, e-mail: users-h...@tomcat.apache.org >>>>> >>>>> >>>> >>> >>> -- >>> >>> [key:62590808] >>> >>> >>> >>> >> > > > -- > > [key:62590808] > > > > -- View this message in context: http://old.nabble.com/JVM-config-for-tomcat7.0.19-tp32819635p32827354.html Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
