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下一步计划：通过加大读写压力使得IoTDB占用内存进一步升高，再次查看堆外内存使用情况，证明堆外内存与读写压力正相关

在如下场景，内存继续升高：

20个存储组 300*8000变量 batch=1000

内存情况如下：

Total: reserved=134GB, committed=132GB
-                 Java Heap (reserved=100GB, committed=99GB)
                            (mmap: reserved=100GB, committed=99GB)

-                    Thread (reserved=1GB, committed=1GB)
                            (thread #834)
                            (stack: reserved=1GB, committed=1GB)

-                        GC (reserved=4GB, committed=4GB)
                            (mmap: reserved=4GB, committed=4GB)

-                  Internal (reserved=29GB, committed=29GB)
                            (malloc=29GB #15358)