how to reduce spring boot memory usage?

Question

I\'m using spring boot to develope client application. and when run spring boot application(using fully executable jar), the memory usage is about 190M in x64 server, and 1

Answer 1

After search, i found it's already have answer in stackoveflow. Spring Boot memory consumption increases beyond -Xmx option

1. Number of http threads (Undertow starts around 50 threads per default, but you can increase / decrease via property the amount of threads needed)
2. Access to native routines (.dll, .so) via JNI
3. Static variables
4. Use of cache (memcache, ehcache, etc)
If a VM is 32 bit or 64 bit, 64 bit uses more memory to run the same application, so if you don't need a heap bigger than 1.5GB, so keep your application runnnig over 32 bit to save memory.

because spring boot starts around 50 threads per default for http service(Tomcat or Undertow, Jetty), and its use 1 MB per thread(64bit jvm default setting).

SO the in 64bit jvm, the memory usage is heap(64M) + Permgen(max 64M) + thread stacks(1M x 50+) + native handles.

references:

• https://dzone.com/articles/how-to-decrease-jvm-memory-consumption-in-docker-u
• http://trustmeiamadeveloper.com/2016/03/18/where-is-my-memory-java/
• https://developers.redhat.com/blog/2017/04/04/openjdk-and-containers/