Shulou(Shulou.com)06/02 Report--

The jstat command allows you to see how much heap memory is being used and how many classes are being loaded. The format of the command is as follows:

jstat [-command option] [vmid] [interval/ms] [number of queries]

Attention!!: The version of jdk used is jdk8.

Class Loading Statistics:

Loaded: Number of loaded classes Bytes: Size of occupied space Unloaded: Unloaded Bytes: Unloaded occupied space Time: Compilation statistics

Compiled: Number of compilations. Failed: Failed Quantity Invalid: Unavailable Quantity Time: FailedType: FailedMethod: Failed Method Garbage Collection Statistics

S0C： Size of the first surviving area S1C: Size of the second surviving area S0U: Size of use of the first surviving area S1U: Size of use of the second surviving area EC: Size of Eden area EU: Size of use of Eden area OC: Size of old age OU: Size of old age MC: Size of method area MU: Size of use of method area CCSC: Size of compressed class space CCSU: Size of compressed class space use YGC: Number of times of garbage collection of young generation YGCT: Time of garbage collection consumption of young generation FGC: Number of times of garbage collection of old age FGCT: Time of garbage collection of old age GCT: Garbage Collection Total Time Heap Memory Statistics

NGCMN： Cenozoic minimum capacity NGCMX: Cenozoic maximum capacity NGC: Current Cenozoic Capacity S0C: The size of the first surviving area S1C: Size of the second survival zone EC: Size of Eden District OGCMN: Old-age minimum capacity OGCMX: OGC: Current old age size OC: Current old age size MCMN: Minimum metadata capacity MCMX: Maximum metadata capacity MC: Current metadata space size CCSMN: Minimum compressed class space size CCSMX: Maximum compressed class space size CCSC: Current compressed class space size YGC: Number of gc of young generation FGC: Number of GC of old age New generation garbage collection statistics

S0C： The size of the first surviving area S1C: Size of the second surviving area S0U: Size of use of the first surviving area S1U: Size of use of the second surviving area TT: Number of times an object survives in the new generation MTT: Maximum number of times an object survives in the new generation DSS: Expected size of the surviving area EC: Size of the Eden area EU: Size of use of the Eden area YGC: Number of times a young generation garbage collection YGCT: Time a young generation garbage collection consumes new generation memory statistics

NGCMN: Cenozoic minimum capacity NGCMX: Cenozoic maximum capacity NGC: Current Cenozoic capacity S0 CMX: Maximum surviving zone 1 size S0 C: Current surviving zone 1 size S1CMX: Maximum surviving zone 2 size S1C: Current surviving zone 2 size ECMX: Maximum Eden zone size EC: Current Eden zone size YGC: Young generation garbage collection times FGC: Old age garbage collection times Old age garbage collection statistics

MC: Method Area Size MU: Method Area Usage Size CCSC: Compressed Class Space Size CCSU: Compressed Class Space Usage Size OC: Old Age Size OU: Old Age Usage Size YGC: Young Generation Garbage Collections FGC: Old Age Garbage Collections FGCT: Old Age Garbage Collection Consumption Time GCT: Total Garbage Collection Consumption Time Old Age Memory Statistics

OGCMN: Minimum capacity of old age OGCMX: Maximum capacity of old age OGC: Size of current old age OC: Size of old age YGC: Number of garbage collections of young generation FGC: Number of garbage collections of old age FGCT: Garbage collection consumption time of old age GCT: Total time of garbage collection consumption Metadata spatial statistics

MCMN: Minimum Metadata Capacity MCMX: Maximum Metadata Capacity MC: Current Metadata Space Size CCSMN: Minimum Compressed Class Space Size CCSMX: Maximum Compressed Class Space Size CCSC: Current Compressed Class Space Size YGC: Number of Garbage Collections of Young Generation FGC: Number of Garbage Collections of Old Generation FGCT: Garbage Collection Consumption Time of Old Generation GCT: Total Garbage Collection Consumption Time Summary Garbage Collection Statistics

S0: Survival Zone 1 Current Usage Proportion S1: Survival Zone 2 Current Usage Proportion E: Eden Zone Usage Proportion O: Old Age Usage Proportion M: Metadata Zone Usage Proportion CCS: Compressed Usage Proportion YGC: Young Generation Garbage Collection Times FGC: Old Age Garbage Collection Times FGCT: Old Age Garbage Collection Consumption Time GCT: Total Garbage Collection Consumption Time JVM Compilation Method Statistics

Compiled: Number of most recently compiled methods Size: Number of bytecodes of most recently compiled methods Type: Compilation type of most recently compiled methods. Method: Method name identification.

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