android - 在android中查询 "dumpsys meminfo"

Question

当我在 android 4.2 上运行“adb shell dumpsys meminfo”时，我得到的结果如下

                                 Shared  Private     Heap     Heap     Heap
               Pss    Dirty    Dirty     Size    Alloc     Free
            ------   ------   ------   ------   ------   ------
   Native       28        8       28    16404    12256     3663
   Dalvik    14062    10060    13736    20032    15254     4778
   Cursor        0        0        0                           
   Ashmem        0        0        0                           
Other dev     4762     9556        0                           
 .so mmap    11699     1824     1500                           
.jar mmap        0        0        0                           
.apk mmap      368        0        0                           
.ttf mmap      811        0        0                           
.dex mmap     3736        0        0                               
Other mmap      114       16       32                           
   Unknown    12064      544    12052                           
     TOTAL    47644    22008    27348    36436    27510     8441

我已阅读 How do I discover memory usage of my application in Android? 的页面，但还有几个问题:

• 为什么原生Pss，shared dirty private dirty 很小？
• 堆大小应该小于 Pss？
• 未知是什么意思？看起来很大。
• 如果我想知道我的应用使用了多少内存，我应该使用哪些数据？总 Pss？但它不包括几乎为零的原生 Pss？

Answer 1

请引用问题How do I discover memory usage of my application in Android? .我还希望你引用Detail VSS,RSS,PSS,USS关联。最适合用于特定应用程序的数据是USS(唯一集大小)为

USS is the total private memory for a process, i.e. that memory that is completely unique to that process . USS is an extremely useful number because it indicates the true incremental cost of running a particular process. When a process is killed, the USS is the total memory that is actually returned to the system. USS is the best number to watch when initially suspicious of memory leaks in a process.

你可以通过 adb shell procrank | grep <your.package.name> 获得