首页 > 其他分享> 文章详细

jmap

2022-08-27 21:33:42 阅读：244 来源： 互联网

标签：used capacity Space MB free jmap

jmap

此命令用来查看内存信息，实例个数以及占用内存大小

jmap

jmap -histo -F 27515 > ./log.txt

查看堆信息

jmap -heap 进程Id

Attaching to process ID 27515, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.201-b09

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

Heap Configuration:
   MinHeapFreeRatio         = 40
   MaxHeapFreeRatio         = 70
   MaxHeapSize              = 536870912 (512.0MB)
   NewSize                  = 178913280 (170.625MB)
   MaxNewSize               = 178913280 (170.625MB)
   OldSize                  = 89522176 (85.375MB)
   NewRatio                 = 2
   SurvivorRatio            = 2
   MetaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxMetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage:
New Generation (Eden + 1 Survivor Space):
   capacity = 134217728 (128.0MB)
   used     = 17779880 (16.956214904785156MB)
   free     = 116437848 (111.04378509521484MB)
   13.247042894363403% used
Eden Space:
   capacity = 89522176 (85.375MB)
   used     = 9343864 (8.911003112792969MB)
   free     = 80178312 (76.46399688720703MB)
   10.437485344413433% used
From Space:
   capacity = 44695552 (42.625MB)
   used     = 8436016 (8.045211791992188MB)
   free     = 36259536 (34.57978820800781MB)
   18.874397165964076% used
To Space:
   capacity = 44695552 (42.625MB)
   used     = 0 (0.0MB)
   free     = 44695552 (42.625MB)
   0.0% used
concurrent mark-sweep generation:
   capacity = 201170944 (191.8515625MB)
   used     = 128766432 (122.80123901367188MB)
   free     = 72404512 (69.05032348632812MB)
   64.0084643635216% used

堆内存dump

jmap -dump:format=b,file=xxx.hprof 进程Id

标签：used,capacity,Space,MB,free,jmap
来源： https://www.cnblogs.com/linlf03/p/16631508.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

ICode9

jmap