jstat(1) Monitoring Tools jstat(1) ' (NAME) jstat - (JVM) (SYNOPSIS) jstat [ generalOption | outputOptions vmid [ interval[s|ms] [ count ] ] generalOption -help -options. . outputOptions statOption -t -h -J. . vmid JVM . : [protocol:][//]lvmid[@hostname[:port]/servername] vmid URI . vmid JVM . . interval [s|ms] (s) (ms). . . jstat . count . jstat JVM jstat . . (DESCRIPTION) jstat Java HotSpot VM (instrumented) . JVM vmid . (VIRTUAL MACHINE IDENTIFIER) vmid URI : [protocol:][//]lvmid[@hostname[:port]/servername] protocol . protocol . protocol rmi . lvmid JVM . lvmid JVM . lvmid . lvmid (PID) JVM . jps lvmid . lvmid Solaris OS X ps Windows Task Manager . hostname IP . hostname . port . hostname protocol port . port . rmi rmiregistry . port protocol rmi rmiregistry () . servername servername . . rmi RMI . (OPTIONS) jstat : . jstat . . . (General Options) . -help . -options . . (Output Options) . jstat statOption (-h -t -J) . statOption . . . -h . . . -t Timestamp . Timestamp ( ) JVM . . interval count jstat . : jstat . jstat . -statOption jstat . . -options . . class: (Class Loader) . compiler: (JIT) Java HotSpot VM . gc: . gccapacity: . gccause: ( -gcutil) ( ) . gcnew: (New Generation) . gcnewcapacity: . gcold: (Old Generation) (Metaspace) . gcoldcapacity: . gcmetacapacity: . gcutil: . printcompilation: Java HotSpot VM . -h n n ( ) n . . -t . JVM . -JjavaOption javaOption . -J-Xms48m . java(1). . (Stat Options and Output) jstat statOption . -class option . Loaded: . Bytes: . Unloaded: . Bytes: . Time: . -compiler option (JIT) Java HotSpot VM. Compiled: . Failed: . Invalid: . Time: . FailedType: . FailedMethod: . -gc option . S0C: (Survivor Space 0) . S1C: . S0U: . S1U: . EC: (Eden Space) . EU: . OC: (Old Space) . OU: . MC: (Metaspace) . MU: . CCSC: (Compressed Class Space) . CCSU: . YGC: . YGCT: . FGC: GC (Full GC). FGCT: . GCT: . -gccapacity option . NGCMN: . NGCMX: . NGC: . S0C: . S1C: . EC: . OGCMN: . OGCMX: . OGC: . OC: . MCMN: . MCMX: . MC: . CCSMN: . CCSMX: . CCSC: . YGC: GC . FGC: GC . -gccause option -gcutil ( ) . -gcutil . LGCC: GCC: -gcnew option . S0C: . S1C: . S0U: . S1U: . TT: (Tenuring Threshold). MTT: . DSS: ( ). EC: . EU: . YGC: GC . YGCT: . -gcnewcapacity option . NGCMN: . NGCMX: . NGC: . S0CMX: . S0C: . S1CMX: . S1C: . ECMX: . EC: . YGC: GC . FGC: GC . -gcold option . MC: . MU: . CCSC: . CCSU: . OC: . OU: . YGC: GC . FGC: GC . FGCT: . GCT: . -gcoldcapacity option . OGCMN: . OGCMX: . OGC: . OC: . YGC: GC . FGC: GC . FGCT: . GCT: . -gcmetacapacity option . MCMN: . MCMX: . MC: . CCSMN: . CCSMX: . YGC: GC . FGC: GC . FGCT: . GCT: . -gcutil option . S0: . S1: . E: . O: . M: . CCS: . YGC: GC . YGCT: . FGC: GC . FGCT: . GCT: . -printcompilation option Java HotSpot VM. Compiled: . Size: . Type: . Method: . (.) (/) . . -XX:+PrintCompilation HotSpot . (EXAMPLES) JVM lvmid . gcutil lvmid -gcutil . . . (E) (O) . . . . . . jstat -gcutil 21891 250 7 S0 S1 E O M CCS YGC YGCT FGC FGCT GCT 0.00 97.02 70.31 66.80 95.52 89.14 7 0.300 0 0.000 0.300 0.00 97.02 86.23 66.80 95.52 89.14 7 0.300 0 0.000 0.300 0.00 97.02 96.53 66.80 95.52 89.14 7 0.300 0 0.000 0.300 91.03 0.00 1.98 68.19 95.89 91.24 8 0.378 0 0.000 0.378 91.03 0.00 15.82 68.19 95.89 91.24 8 0.378 0 0.000 0.378 91.03 0.00 17.80 68.19 95.89 91.24 8 0.378 0 0.000 0.378 91.03 0.00 17.80 68.19 95.89 91.24 8 0.378 0 0.000 0.378 lvmid -gcnew . -h3 . GC . . . (S0U) (DSS) . ( ) (TT) . . . jstat -gcnew -h3 21891 250 S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT 64.0 64.0 0.0 31.7 31 31 32.0 512.0 178.6 249 0.203 64.0 64.0 0.0 31.7 31 31 32.0 512.0 355.5 249 0.203 64.0 64.0 35.4 0.0 2 31 32.0 512.0 21.9 250 0.204 S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT 64.0 64.0 35.4 0.0 2 31 32.0 512.0 245.9 250 0.204 64.0 64.0 35.4 0.0 2 31 32.0 512.0 421.1 250 0.204 64.0 64.0 0.0 19.0 31 31 32.0 512.0 84.4 251 0.204 S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT 64.0 64.0 0.0 19.0 31 31 32.0 512.0 306.7 251 0.204 lvmid . -t . Timestamp JVM . -gcoldcapacity (OGC) (OC) . (OGC) (FGC) . ( ) (OGCMX) . Timestamp OGCMN OGCMX OGC OC YGC FGC FGCT GCT 150.1 1408.0 60544.0 11696.0 11696.0 194 80 2.874 3.799 150.4 1408.0 60544.0 13820.0 13820.0 194 81 2.938 3.863 150.7 1408.0 60544.0 13820.0 13820.0 194 81 2.938 3.863 JVM -gcutil lvmid remote.domain . lvmid vmid 40496@remote.domain . vmid rmi jstatd . jstatd rmiregistry remote.domain rmiregistry ( ) . jstat -gcutil 40496@remote.domain 1000 ... output omitted (SEE ALSO) o java(1) o jps(1) o jstatd(1) o rmiregistry(1) 'pl 8.5i 'bp JDK 8 03 March 2015 jstat(1)