教你如何通过JConsoler监控Tomcat的JVM内存

[root@localhost ~]# jps -lvm7457 org.apache.catalina.startup.Bootstrap start start -Djava.util.logging.config.file=/application/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -Dcatalina.base=/application/tomcat -Dcatalina.home=/application/tomcat -Djava.io.tmpdir=/application/tomcat/temp7525 org.apache.catalina.startup.Bootstrap start start -Djava.util.logging.config.file=/application/tomcat_8082/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -Dcatalina.base=/application/tomcat_8082 -Dcatalina.home=/application/tomcat_8082 -Djava.io.tmpdir=/application/tomcat_8082/temp9144 sun.tools.jps.Jps -lvm -Denv.class.path=.:/application/jdk/lib:/application/jdk/jre/lib:/application/jdk/lib/tools.jar -Dapplication.home=/application/jdk1.8.0_60 -Xms8m7482 org.apache.catalina.startup.Bootstrap start start -Djava.util.logging.config.file=/application/tomcat_8081/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -Dcatalina.base=/application/tomcat_8081 -Dcatalina.home=/application/tomcat_8081 -Djava.io.tmpdir=/application/tomcat_8081/temp

[root@localhost ~]# jmap -heap 7457Attaching to process ID 7457, please wait...Debugger attached successfully.Server compiler detected.JVM version is 25.60-b23using thread-local object allocation.Mark Sweep Compact GCHeap Configuration:   MinHeapFreeRatio         = 40   MaxHeapFreeRatio         = 70   MaxHeapSize              = 255852544 (244.0MB)   NewSize                  = 5570560 (5.3125MB)   MaxNewSize               = 85262336 (81.3125MB)   OldSize                  = 11206656 (10.6875MB)   NewRatio                 = 2   SurvivorRatio            = 8   MetaspaceSize            = 21807104 (20.796875MB)   CompressedClassSpaceSize = 1073741824 (1024.0MB)   MaxMetaspaceSize         = 17592186044415 MB   G1HeapRegionSize         = 0 (0.0MB)Heap Usage:			#监控的话关注这一列New Generation (Eden + 1 Survivor Space):   capacity = 12779520 (12.1875MB)   used     = 11689352 (11.147834777832031MB)   free     = 1090168 (1.0396652221679688MB)   91.46941356169872% usedEden Space:				#监控的话关注这一列   capacity = 11403264 (10.875MB)   used     = 11059616 (10.547271728515625MB)   free     = 343648 (0.327728271484375MB)   96.98640669899426% usedFrom Space:					#监控的话关注这一列   capacity = 1376256 (1.3125MB)   used     = 629736 (0.6005630493164062MB)   free     = 746520 (0.7119369506835938MB)   45.75718470982143% usedTo Space:				#监控的话关注这一列   capacity = 1376256 (1.3125MB)   used     = 0 (0.0MB)   free     = 1376256 (1.3125MB)   0.0% usedtenured generation:				#监控的话关注这一列   capacity = 28164096 (26.859375MB)   used     = 18313224 (17.46485137939453MB)   free     = 9850872 (9.394523620605469MB)   65.02329774760035% used21146 interned Strings occupying 1882520 bytes.