ozw999 opened a new issue #3332:
URL: https://github.com/apache/rocketmq/issues/3332
JVM Parameters :
```
-Xms1g -Xmx1g -Xmn512m -XX:MaxDirectMemorySize=6g
-Dio.netty.maxDirectMemory=1g
```
broker.properties :
```
transientStorePoolEnable=true
transientStorePoolSize=5
```
**When borker is running, memory usage is :**
[top] :
```
PID USER PR NI VIRT RES SHR S %CPU %MEM
TIME+ COMMAND
xxx xxx 20 0 66.5g 9.6g 3.3g S 6.7 15.4
15:31.46 java
```
[Native Memory Tracking] :
```
Total: reserved=8703173KB, committed=7428985KB
- Java Heap (reserved=1048576KB, committed=1048576KB)
(mmap: reserved=1048576KB, committed=1048576KB)
- Class (reserved=1076036KB, committed=30224KB)
(classes #4402)
(malloc=836KB #10413)
(mmap: reserved=1075200KB, committed=29388KB)
- Thread (reserved=544671KB, committed=544671KB)
(thread #530)
(stack: reserved=543388KB, committed=543388KB)
(malloc=663KB #2695)
(arena=620KB #1043)
- Code (reserved=253682KB, committed=27354KB)
(malloc=4082KB #6258)
(mmap: reserved=249600KB, committed=23272KB)
- GC (reserved=151361KB, committed=151361KB)
(malloc=79681KB #5496)
(mmap: reserved=71680KB, committed=71680KB)
- Compiler (reserved=751KB, committed=751KB)
(malloc=620KB #907)
(arena=131KB #18)
- Internal (reserved=5618182KB, committed=5618182KB)
(malloc=5618150KB #12872)
(mmap: reserved=32KB, committed=32KB)
- Symbol (reserved=5938KB, committed=5938KB)
(malloc=4012KB #30016)
(arena=1926KB #1)
- Native Memory Tracking (reserved=1153KB, committed=1153KB)
(malloc=53KB #572)
(tracking overhead=1100KB)
- Arena Chunk (reserved=777KB, committed=777KB)
(malloc=777KB)
- Unknown (reserved=2048KB, committed=0KB)
(mmap: reserved=2048KB, committed=0KB)
```
**Why broker ues 'RES' 9.6G？**
Somebody help me to explain this problem. Thanks.
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