Reproduced in https://www.cnblogs.com/alter888/p/10407952.html
jstat command to view the amount of each portion, and the number of loaded classes heap memory. Format of the command is as follows:
jstat [- command options] [vmid] [interval / ms] [queries]
note! ! ! : Jdk version is jdk8.
Class loading statistics:
- Loaded: load the number of class
- Bytes: occupied space
- Unloaded: Quantity is not loaded
- Bytes: not loaded space
- Time: Time
Compile statistics
- Compiled: the number of compilation.
- Failed: the number of failures
- Invalid: not quantifiable
- Time: Time
- FailedType: type of failure
- FailedMethod: method failure
Garbage collection statistics
- S0C: size of the first surviving area
- S1C: the size of the second zone of surviving
- S0U: using the size of the first surviving area
- S1U: Use the size of the second zone of surviving
- EC: the size of the area of the Garden of Eden
- EU: Use the size of the area of the Garden of Eden
- OC: old's size
- OU: old's use of size
- MC: method area size
- MU: Method using size region
- CCSC: compression class space
- CCSU: compression class size space usage
- YGC: the young generation the number of garbage recycling
- YGCT: the young generation garbage collection time-consuming
- FGC: the number of years the old garbage collection
- FGCT: old's garbage collection time-consuming
- GCT: garbage collection consume the total time
Heap memory statistics
NGCMN: New Generation minimum capacity
- NGCMX: the new generation of maximum capacity
- NGC: Current new generation capacity
- S0C: The first area the size of a survivor
- S1C: the size of the second zone of surviving
- EC: the size of the area of the Garden of Eden
- OGCMN: old's minimum capacity
- OGCMX: old's maximum capacity
- OGC: The current size of the old year
- OC: The current size of the old year
- MCMN: minimum capacity Metadata
- MCMX: The maximum capacity of metadata
- MC: current metadata space
- CCSMN: minimum compression space Class
- CCSMX: maximum compression class space
- CCSC: current compression class space
- YGC: the young generation the number of gc
- FGC: Old number of GC's
The new generation garbage collection statistics
- S0C: The first area the size of a survivor
- S1C: the size of the second zone of surviving
- S0U: using the size of the first surviving area
- S1U: Use the size of the second zone of surviving
- TT: the number of objects in the new generation of survival
- MTT: the maximum number of objects in the new generation of survival
- DSS: the desired size of the surviving area
- EC: the size of the area of the Garden of Eden
- EU: Use the size of the area of the Garden of Eden
- YGC: the young generation the number of garbage recycling
- YGCT: the young generation garbage collection time-consuming
The new generation of memory statistics
- NGCMN: New Generation minimum capacity
- NGCMX: the new generation of maximum capacity
- NGC: Current new generation capacity
- S0CMX: The maximum size of the surviving Zone 1
- S0C: The current size of the surviving Zone 1
- S1CMX: The maximum size of the surviving Zone 2
- S1C: The current size of the surviving Zone 2
- ECMX: The maximum size of the Eden District
- EC: The current size of the Eden District
- YGC: the young generation the number of garbage recycling
- FGC: old's recovery times
Garbage collection old's statistics
- MC: method area size
- MU: Method using size region
- CCSC: compression class space
- CCSU: compression class size space usage
- OC: old's size
- OU: old's use of size
- YGC: the young generation the number of garbage recycling
- FGC: the number of years the old garbage collection
- FGCT: old's garbage collection time-consuming
- GCT: garbage collection consume the total time
Old's memory statistics
- OGCMN: old's minimum capacity
- OGCMX: old's maximum capacity
- OGC: The current size of the old year
- OC: old's size
- YGC: the young generation the number of garbage recycling
- FGC: the number of years the old garbage collection
- FGCT: old's garbage collection time-consuming
- GCT: garbage collection consume the total time
Metadata spatial statistics
- MCMN: minimum capacity Metadata
- MCMX: The maximum capacity of metadata
- MC: current metadata space
- CCSMN: minimum compression space Class
- CCSMX: maximum compression class space
- CCSC: current compression class space
- YGC: the young generation the number of garbage recycling
- FGC: the number of years the old garbage collection
- FGCT: old's garbage collection time-consuming
- GCT: garbage collection consume the total time
Garbage collection statistics summary
- S0: surviving the current Zone 1 use ratio
- S1: surviving area currently used in a proportion 2
- E: Eden area using a proportional
- O: the proportion of older years
- M: metadata area ratio using
- CCS: compression ratio Use
- YGC: the young generation the number of garbage recycling
- FGC: the number of years the old garbage collection
- FGCT: old's garbage collection time-consuming
- GCT: garbage collection consume the total time
JVM statistics compiled methods
- : Compiled number of recent compilation method
- : Size Number bytecode recently compiled method
- Type: compilation type recently compiled method.
- Method: method name identification.