View memory usage in Linux and Android

1. procrank (only for Android)

It reads information from/proc/Pid/maps for statistics. The source code is located at:/system/extras/procrank

Memory consumption: VSS/RSS/PSS/USS
• VSS-virtual set size virtual memory consumption (including memory occupied by shared libraries)
• RSS-resident set size actually uses physical memory (including memory occupied by shared libraries)
• Pss-proportional set size physical memory actually used (proportional allocation of memory occupied by the Shared Library)
• Uss-unique set size physical memory occupied by the process (excluding the memory occupied by the Shared Library)

2. CAT/proc/Pid/status

Vmpeak: indicates the maximum virtual memory occupied by a process.
Vmsize: indicates the current virtual memory size of the process.
Vmlck: memory size locked
Vmhwm: indicates the peak value of the physical memory occupied by the process.
Vmrss: indicates the size of the physical memory occupied by the process (with RSS in procrank)
Vmdata: Specifies the Data Segment Size of a process.
Vmstk: indicates the size of the process stack segment.
Vmexe: indicates the size of the Process Code.
Vmlib: indicates the size of the shared library used by the process.
Vmpte: indicates the size of the table items on the process page.

 

3. Example

shell@android:/ $ procrank                                                       PID    Vss       Rss      Pss      Uss  cmdline16044  247156K   94580K   81361K   79708K  com.android.pingpang16698  242440K   66436K   45516K   42064K  com.android.yujiashell@android:/ $ cat /proc/16044/status    VmPeak:  703476 kBVmSize:  550940 kBVmLck:       0 kBVmHWM:  101500 kBVmRSS:   94140 kBVmData:  102016 kBVmStk:     136 kBVmExe:       8 kBVmLib:   37968 kBVmPTE:     346 kBVmSwap:       0 kBThreads:22shell@android:/ $ cat /proc/16698/status                                       VmPeak:  693460 kBVmSize:  516736 kBVmLck:       0 kBVmHWM:   71204 kBVmRSS:   66060 kBVmData:   58960 kBVmStk:     136 kBVmExe:       8 kBVmLib:   46568 kBVmPTE:     344 kBVmSwap:       0 kBThreads:26

 

Reference: http://www.kernel.org/doc/man-pages/online/pages/man5/proc.5.html