JSTAT(1) JDK Commands JSTAT(1) (NAME) jstat - (JVM) ( ) (SYNOPSIS) : . jstat generalOptions jstat outputOptions [-t] [-h lines] vmid [interval [count]] generalOptions . (GENERAL OPTIONS) . outputOptions -options . statOption -t -h -J. JSTAT . -t (Timestamp) . JVM . -h n () n ( ) n . 0 . vmid JVM . (VIRTUAL MACHINE IDENTIFIER) . interval (s) (ms). . . jstat . count . jstat JVM jstat . . (DESCRIPTION) jstat Java HotSpot VM . JVM vmid . jstat : . jstat . . . (GENERAL OPTIONS) . -help . -options . JSTAT . JSTAT (OUTPUT OPTIONS FOR THE JSTAT COMMAND) . jstat statOption (-h -t -J) . statOption . . . -h . . . -t Timestamp . Timestamp JVM . (threads) . interval count jstat . : jstat . jstat . -statOption jstat . . -options . (STAT OPTIONS AND OUTPUT) . class: (Class Loader) . compiler: (JIT) Java HotSpot VM . gc: . gccapacity: . gccause: ( -gcutil) ( ) . gcnew: (Young Generation) . gcnewcapacity: . gcold: (Old Generation) (Metaspace) . gcoldcapacity: . gcmetacapacity: . gcutil: . printcompilation: Java HotSpot VM . -JjavaOption javaOption . -J-Xms48m . java . (STAT OPTIONS AND OUTPUT) jstat statOption . -class (Class Loader). Loaded: . Bytes: . Unloaded: . Bytes: . Time: . -compiler (JIT) Java HotSpot VM. Compiled: . Failed: . Invalid: . Time: . FailedType: . FailedMethod: . -gc . S0C: (Survivor space 0) . S1C: (Survivor space 1) . S0U: . S1U: . EC: (Eden space) . EU: . OC: (Old space) . OU: . MC: (Metaspace Committed Size) . MU: . CCSC: (Compressed class committed size) . CCSU: . YGC: (Young Generation GC). YGCT: . FGC: (Full GC). FGCT: . GCT: . -gccapacity . NGCMN: (). NGCMX: (). NGC: (). S0C: (). S1C: (). EC: (). OGCMN: (). OGCMX: (). OGC: (). OC: (). MCMN: (). MCMX: (). MC: (). CCSMN: (). CCSMX: (). CCSC: (). YGC: GC . FGC: GC . -gccause -gcutil ( ) . -gcutil : LGCC: GCC: -gcnew . S0C: (). S1C: (). S0U: (). S1U: (). TT: (Tenuring threshold). MTT: . DSS: (). EC: (). EU: (). YGC: GC . YGCT: . -gcnewcapacity . NGCMN: (). NGCMX: (). NGC: (). S0CMX: (). S0C: (). S1CMX: (). S1C: (). ECMX: (). EC: (). YGC: GC . FGC: GC . -gcold . MC: (). MU: (). CCSC: (). CCSU: (). OC: (). OU: (). YGC: GC . FGC: GC . FGCT: . GCT: . -gcoldcapacity . OGCMN: (). OGCMX: (). OGC: (). OC: (). YGC: GC . FGC: GC . FGCT: . GCT: . -gcmetacapacity . MCMN: (). MCMX: (). MC: (). CCSMN: (). CCSMX: (). YGC: GC . FGC: GC . FGCT: . GCT: . -gcutil . S0: . S1: . E: . O: . M: . CCS: . YGC: GC . YGCT: . FGC: GC . FGCT: . GCT: . -printcompilation Java HotSpot VM. Compiled: . Size: . Type: . Method: . (.) (/) . . -XX:+PrintCompilation HotSpot . (VIRTUAL MACHINE IDENTIFIER) vmid URI : [protocol:][//]lvmid[@hostname[:port][/servername] vmid URI . vmid JVM . protocol . protocol . protocol rmi . lvmid JVM . lvmid JVM . lvmid . lvmid ( ) (PID) JVM . jps lvmid JVM . macOS ps Task Manager lvmid . hostname IP . hostname . port . hostname protocol port . port . rmi rmiregistry . port protocol rmi rmiregistry ( 1099) . servername servername . . rmi RMI . (EXAMPLES) JVM lvmid 21891 . GCUTIL (THE GCUTIL OPTION) lvmid 21891 -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 (REPEAT THE COLUMN HEADER STRING) lvmid 21891 -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 (INCLUDE A TIME STAMP FOR EACH SAMPLE) lvmid 21891 . -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 (MONITOR INSTRUMENTATION FOR A REMOTE JVM) -gcutil lvmid 40496 remote.domain . lvmid vmid 40496@remote.domain . vmid rmi jstatd . jstatd rmiregistry remote.domain rmiregistry ( 1099) . jstat -gcutil 40496@remote.domain 1000 ... JDK 25.0.4.1 2026 JSTAT(1)