每五秒钟查询一个可用物理内存并将结果写入日志文件。
Every five seconds, query the available physical memory and write the result to the log file.
垃圾收集器将尝试适当调整堆的大小，但将避免使用同一机器上多半的可用物理内存。
The garbage collector will try to size the heap appropriately, but it will avoid using more than half the physical memory available on the machine.
由于可寻址内存的范围从数百到数十亿gb，可用物理内存(RAM)的限制变得更加重要。
With addressable memory in the range of hundreds to billions of gigabytes, it is the available physical memory (RAM) limitation that becomes much more important.
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