[GitHub] johnsonyang commented on issue #186: [ROCKETMQ-307] Polish the JVM parameters in start scriptes

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johnsonyang commented on issue #186: [ROCKETMQ-307] Polish the JVM parameters in start scriptes
URL: https://github.com/apache/rocketmq/pull/186#issuecomment-341602398
 
 
   Hi, zhou
   
   thanks you feedback quickly!
   
   1. From the jvm arguments view, the `MetaspaceSize` and `MaxMetaspaceSize` in JDK8 used to replace the `-XX:PermSize` and `-XX:MaxPermSize`, in JDK8, Metaspace?JEP 122?used to replace the PermGen space to improve GC performance. The Metaspace used the direct memory, as I know, the default value is no limit if NOT set a value, it will use all memory.
   
   2. The `MetaspaceSize` and `MaxMetaspaceSize` be introduced from JDK8, I also check the rocketMQ [releases note](https://rocketmq.apache.org/dowloading/releases/), the rocket recommend used the JDK8 on the Broker and NameServer, below info for your check quickly!
   Version	Client	Broker	NameServer
   4.0.0-incubating	>=1.7	>=1.8	>=1.8
   4.1.0-incubating	>=1.6	>=1.8	>=1.8
   
   

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