Jstat view GC

Jstat 1. jstat-gc pid can display gc information, check gc times, and time. The last five items are the young gc count, young gc time, full gc count, full gc time, and total gc time. 2. jstat-gccapacity pid can display the usage and usage of three generations (young, old, perm) objects in the VM memory. For example, pgcen shows the minimum memory usage of perm, PGCMX displays the maximum memory usage of perm. PGC is the memory usage of the newly generated perm, while PC is the memory usage of the previous perm. For others, the OC usage is pure in old. 3. jstat-gcutil pid statistics gc statistics. 4. jstat-gcnew pid information of the young generation object. 5. jstat-gcnewcapacity pid information of the young generation object and its usage. 6. jstat-gcold pid old generation object information. 7. stat-gcoldcapacity pid old generation object information and usage. 8. jstat-gcpermcapacity pid perm object information and usage. 9. The jstat-class pid displays the number of loaded classes and the occupied space. 10. jstat-compiler pid displays information such as the number of real-time VM compilations. 11. stat-printcompilation pid information of the current VM execution. Explanation of some terms in Chinese: S0C: capacity (in bytes) of the first surviving vor in the young generation S1C: capacity (in bytes) of the second surviving vor in the young generation) s0U: The first surviving vor in the young generation currently uses space (bytes) S1U: The second surviving vor in the young generation currently uses space (bytes) EC: capacity (bytes) of Eden (Eden) in the young generation EU: Eden (Eden) in the young generation currently uses space (bytes) OC: Capacity (bytes) of the Old generation OU: the Old generation currently uses space (bytes) PC: Perm (persistent generation) Capacity (bytes) PU: Perm (persistent generation) currently uses space (bytes) YGC: number of gc times in the young generation from application initiation to sampling YGCT: time (s) FGC used in the young generation from application initiation to sampling: from application initiation to sampling the number of gc times of the old generation (full gc) FGCT: from application initiation to sampling the time (s) GCT used by the old generation (full gc) gc: total gc time (s) from application startup to sampling ngcen: minimum size (bytes) of initialization in young generation (young) NGCMX: young generation (young) maximum capacity (bytes) NGC: The current capacity (bytes) in the young generation (young) ogcen: the initial (minimum) size (bytes) in the old generation (OGCMX: the maximum capacity (bytes) of the old generation OGC: The size (bytes) of the initial (minimum) in the old generation pgcen: perm generation PGCMX: maximum perm generation capacity (byte) www.2cto.com PGC: current new generation capacity (byte) of the perm generation S0: The first surviving vor in the young generation) percentage of used current capacity S1: Percentage of used current capacity in the second region vor in the young generation E: Eden in the young generation (Eden) percentage of used current capacity O: Percentage of used current capacity in the old generation P: Percentage of used current capacity in the perm generation S0CMX: the maximum capacity (in bytes) of the first surviving vor in the young generation S1CMX: the maximum capacity (in bytes) of the second surviving vor in the young generation ECMX: the maximum capacity (bytes) DSS of Eden (Eden) in the young generation: the capacity (bytes) of the active VOR (the Eden zone is full) TT: the number of holding times limit: MTT: max hold limit