linux 查看内存使用情况查看当前应用内存状况

导读1、查看进程号ps-ef|greptomcat，我来为大家讲解一下关于linux查看内存使用情况?跟着小编一起来看一看吧!linux查看内存使用情况1、查看....

1、查看进程号ps -ef | grep tomcat，我来为大家讲解一下关于linux 查看内存使用情况?跟着小编一起来看一看吧!

linux 查看内存使用情况

1、查看进程号

ps -ef | grep tomcat

2、查看当前内存分配，200ms打印一次

jstat -gc 进程号 200 1

jstat -gc 34480 200 1

S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT 14848.0 15360.0 10907.4 0.0 2699776.0 927300.9 1175040.0 636762.8 276908.0 238024.6 31148.0 26766.2 3510 72.635 6 2.610 75.245

S0C：第一个幸存区的大小S1C：第二个幸存区的大小S0U：第一个幸存区的使用大小S1U：第二个幸存区的使用大小EC：伊甸园区的大小EU：伊甸园区的使用大小OC：老年代大小OU：老年代使用大小MC：方法区大小MU：方法区使用大小CCSC:压缩类空间大小CCSU:压缩类空间使用大小YGC：年轻代垃圾回收次数YGCT：年轻代垃圾回收消耗时间FGC：老年代垃圾回收次数FGCT：老年代垃圾回收消耗时间GCT：垃圾回收消耗总时间

3、查看当前堆使用情况

jmap -Heap 34480

Attaching to process ID 34480, please wait...Debugger attached successfully.Server compiler detected.JVM version is 25.192-b12using thread-local object allocation.Parallel GC with 8 thread(s)Heap Configuration: MinHeapFreeRatio = 0 MaxHeapFreeRatio = 100 MaxHeapSize = 8388608000 (8000.0MB) NewSize = 174587904 (166.5MB) MaxNewSize = 2796027904 (2666.5MB) OldSize = 349700096 (333.5MB) NewRatio = 2 SurvivorRatio = 8 MetaspaceSize = 21807104 (20.796875MB) CompressedClassSpaceSize = 1073741824 (1024.0MB) MaxMetaspaceSize = 17592186044415 MB G1HeapRegionSize = 0 (0.0MB)Heap Usage:PS Young GenerationEden Space: capacity = 2764570624 (2636.5MB) used = 1962159688 (1871.2612991333008MB) free = 802410936 (765.2387008666992MB) 70.97520573234594% usedFrom Space: capacity = 15204352 (14.5MB) used = 11169176 (10.651756286621094MB) free = 4035176 (3.8482437133789062MB) 73.46038818359375% usedTo Space: capacity = 15728640 (15.0MB) used = 0 (0.0MB) free = 15728640 (15.0MB) 0.0% usedPS Old Generation capacity = 1203240960 (1147.5MB) used = 652045072 (621.8386383056641MB) free = 551195888 (525.6613616943359MB) 54.19073100702955% used88789 interned Strings occupying 9011304 bytes.

从23行heap usage 就可以看到当前堆的状况