linux 查看内存使用情況?1、查看進程号ps -ef | grep tomcat，我來為大家講解一下關于linux 查看内存使用情況?跟着小編一起來看一看吧!

linux 查看内存使用情況

1、查看進程号

ps -ef | grep tomcat

2、查看當前内存分配，200ms打印一次

jstat -gc 進程号 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：第一個幸存區的大小 S1C：第二個幸存區的大小 S0U：第一個幸存區的使用大小 S1U：第二個幸存區的使用大小 EC：伊甸園區的大小 EU：伊甸園區的使用大小 OC：老年代大小 OU：老年代使用大小 MC：方法區大小 MU：方法區使用大小 CCSC:壓縮類空間大小 CCSU:壓縮類空間使用大小 YGC：年輕代垃圾回收次數 YGCT：年輕代垃圾回收消耗時間 FGC：老年代垃圾回收次數 FGCT：老年代垃圾回收消耗時間 GCT：垃圾回收消耗總時間

3、查看當前堆使用情況

jmap -Heap 34480

Attaching to process ID 34480, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.192-b12 using 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 Generation Eden Space: capacity = 2764570624 (2636.5MB) used = 1962159688 (1871.2612991333008MB) free = 802410936 (765.2387008666992MB) 70.97520573234594% used From Space: capacity = 15204352 (14.5MB) used = 11169176 (10.651756286621094MB) free = 4035176 (3.8482437133789062MB) 73.46038818359375% used To Space: capacity = 15728640 (15.0MB) used = 0 (0.0MB) free = 15728640 (15.0MB) 0.0% used PS Old Generation capacity = 1203240960 (1147.5MB) used = 652045072 (621.8386383056641MB) free = 551195888 (525.6613616943359MB) 54.19073100702955% used 88789 interned Strings occupying 9011304 bytes.

從23行heap usage 就可以看到當前堆的狀況

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