ahuazhu commented on issue #1252: how to decrease broker memory URL: https://github.com/apache/rocketmq/issues/1252#issuecomment-503964673 @finalcola Does this cause any problem? 1. MappedByteBuffer creates Virtual-memory mapping with JVM memory thus READ/WRITE operations do not need System-Call. And it does not occupy the JVM heap but virtual memory space only. 2. When you use `top` to diagnose the memory usage, a large `RES` may be displayed. Just feel free, you could use `free -m` or `free -g` to check the actual memory usage by `used`. You may also find an amount of memory used by `buff/cache`, you could treat this part of memory as `free`.
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