【容器相关】docker查看JVM内存使用情况

[root@docker_test ~]# docker top 9bf87ef0db42
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                11967               11949               0                   Oct04               ?                   00:00:00            sh /home/apps/start.sh
root                11992               11967               3                   Oct04               ?                   03:17:10            java -Xms128m -Xmx1800m -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOccupancyonly -XX:+HeapDumponOutOfMemoryError -XX:HeapDumpPath=/home/apps/log/payvoucherservice -Djava.security.egd=file:/dev/./urandom -Dservicecomb.configurationSource.additionalUrls=file:///home/apps/config/application.yml -jar ./pay-voucher-service-2.0.0-RELEASE.jar

[root@docker_test ~]# docker exec -it 9bf87ef0db42 /bin/bash
[root@pay-voucher-service-bosi-x1hgv2-5568cfd4d9-2jt9h apps]# ps -ef
UID        PID  PPID  C STIME TTY          TIME CMD
root         1     0  0 Oct04 ?        00:00:00 sh /home/apps/start.sh
root         9     1  3 Oct04 ?        03:17:10 java -Xms128m -Xmx1800m -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOcc
root      1886     0  0 11:11 pts/0    00:00:00 /bin/bash
root      1901  1886  0 11:11 pts/0    00:00:00 ps -ef

[root@pay-voucher-service-docker-x1hgv2-5568cfd4d9-2jt9h apps]# jmap -heap 9
Attaching to process ID 9, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.262-b13

using parallel threads in the new generation.
using thread-local object allocation.
Concurrent Mark-Sweep GC

Heap Configuration:
   MinHeapFreeRatio         = 40
   MaxHeapFreeRatio         = 70
   MaxHeapSize              = 1887436800 (1800.0MB)
   NewSize                  = 44695552 (42.625MB)
   MaxNewSize               = 348913664 (332.75MB)
   OldSize                  = 89522176 (85.375MB)
   NewRatio                 = 2
   SurvivorRatio            = 8
   metaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxmetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage:
New Generation (Eden + 1 Survivor Space):
   capacity = 40239104 (38.375MB)
   used     = 25850304 (24.65277099609375MB)
   free     = 14388800 (13.72222900390625MB)
   64.2417485240228% used
Eden Space:
   capacity = 35782656 (34.125MB)
   used     = 23710256 (22.611862182617188MB)
   free     = 12072400 (11.513137817382812MB)
   66.26186720180861% used
From Space:
   capacity = 4456448 (4.25MB)
   used     = 2140048 (2.0409088134765625MB)
   free     = 2316400 (2.2090911865234375MB)
   48.021383846507355% used
To Space:
   capacity = 4456448 (4.25MB)
   used     = 0 (0.0MB)
   free     = 4456448 (4.25MB)
   0.0% used
concurrent mark-sweep generation:
   capacity = 406192128 (387.375MB)
   used     = 198461920 (189.26803588867188MB)
   free     = 207730208 (198.10696411132812MB)
   48.859125108401905% used

45856 interned Strings occupying 4804848 bytes.