elasticsearch jvm优化

测试环境elasticsearch jvm 4G jdk1.8

[serveradm@test-log-server elasticsearch]$ java -version
java version "1.8.0_212"
Java(TM) SE Runtime Environment (build 1.8.0_212-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.212-b10, mixed mode)
[serveradm@test-log-server elasticsearch]$ 

 

-Xms4g
-Xmx4g

 jmap -heap pid查看heap内存大小

[serveradm@test-log-server elasticsearch]$ jmap -heap 11516
Attaching to process ID 11516, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.212-b10

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

Heap Configuration:
   MinHeapFreeRatio         = 40
   MaxHeapFreeRatio         = 70
   MaxHeapSize              = 4294967296 (4096.0MB)
   NewSize                  = 348913664 (332.75MB)
   MaxNewSize               = 348913664 (332.75MB)
   OldSize                  = 3946053632 (3763.25MB)
   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 = 314048512 (299.5MB)
   used     = 275463512 (262.70247650146484MB)
   free     = 38585000 (36.797523498535156MB)
   87.7136816365492% used
Eden Space:
   capacity = 279183360 (266.25MB)
   used     = 245544536 (234.16951751708984MB)
   free     = 33638824 (32.080482482910156MB)
   87.95099249468163% used
From Space:
   capacity = 34865152 (33.25MB)
   used     = 29918976 (28.532958984375MB)
   free     = 4946176 (4.717041015625MB)
   85.81341047932331% used
To Space:
   capacity = 34865152 (33.25MB)
   used     = 0 (0.0MB)
   free     = 34865152 (33.25MB)
   0.0% used
concurrent mark-sweep generation:
   capacity = 3946053632 (3763.25MB)
   used     = 27565128 (26.28815460205078MB)
   free     = 3918488504 (3736.961845397949MB)
   0.6985492487092482% used

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