本文介绍如何获得单个进程的内存及CPU使用信息。
内存耗用:VSS/RSS/PSS/USS
TermsUSS 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.
1、利用Android API函数查看
1.1 ActivityManager查看可用内存。
2、直接对Android文件进行解析查询,
/proc/cpuinfo系统CPU的类型等多种信息。
/proc/meminfo 系统内存使用信息
如
/proc/meminfo
MemTotal: 16344972 kB
MemFree: 13634064 kB
Buffers: 3656 kB
Cached: 1195708 kB
我们查看机器内存时,会发现MemFree的值很小。这主要是因为,在linux中有这么一种思想,内存不用白不用,因此它尽可能的cache和buffer一些数据,以方便下次使用。但实际上这些内存也是可以立刻拿来使用的。
所以 空闲内存=free+buffers+cached=total-used
通过读取文件/proc/meminfo的信息获取Memory的总量。
ActivityManager. getMemoryInfo(ActivityManager.MemoryInfo)获取当前的可用Memory量。
3、通过Android系统提供的Runtime类,执行adb 命令(top,procrank,ps...等命令)查询
通过对执行结果的标准控制台输出进行解析。这样大大的扩展了Android查询功能.例如:
final Process m_process = Runtime.getRuntime().exec("/system/bin/top -n 1");
final StringBuilder sbread = new StringBuilder();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(m_process.getInputStream()), 8192);
# procrank
Runtime.getRuntime().exec("/system/xbin/procrank");