Android系统检测程序内存占用各种方法

1.检查系统总内存

liuhx@uc ~ $ adb shell cat /proc/meminfo
memtotal:         840868 kb
memfree:          457344 kb
buffers:            1744 kb
cached:           203064 kb
swapcached:            0 kb
active:           234932 kb
inactive:         129644 kb
active(anon):     170292 kb
inactive(anon):        0 kb
active(file):      64640 kb
inactive(file):   129644 kb
unevictable:           0 kb
mlocked:               0 kb
swaptotal:             0 kb
swapfree:              0 kb
dirty:                 0 kb
writeback:             0 kb
anonpages:        159820 kb
mapped:            97916 kb
slab:               7808 kb
sreclaimable:       2920 kb
sunreclaim:         4888 kb
pagetables:         3516 kb
nfs_unstable:          0 kb
bounce:                0 kb
writebacktmp:          0 kb
commitlimit:      420432 kb
committed_as:    1295272 kb
vmalloctotal:     122880 kb
vmallocused:       16508 kb
vmallocchunk:      76804 kb

第一行memtotal就是总内存。一般并不会等于手机标榜的数值。说是2g内存的手机，会在1.8g左右

2.检查某个程序的各类型内存占用

可用dumpsys meminfo 包名。不知道包名的话，可以用ps命令得到所有运行的程序，也包括得到pid。以自带的浏览器为例：

liuhx@uc ~ $ adb shell dumpsys meminfo com.android.browser
applications memory usage (kb):
uptime: 23140065 realtime: 23140065

** meminfo in pid 939 [com.android.browser] **
                         shared  private     heap     heap     heap
                   pss    dirty    dirty     size    alloc     free
                ------   ------   ------   ------   ------   ------
       native     7111      748     7048     8964     8634      329
       dalvik     7338     5096     6892     7568     7041      527
       cursor        0        0        0                          
       ashmem      276        0      276                          
    other dev        4        0        0                          
     .so mmap     5050     1728      252                          
    .jar mmap        0        0        0                          
    .apk mmap      418        0        0                          
    .ttf mmap      439        0        0                          
    .dex mmap        0        0        0                          
   other mmap     2320       16       24                          
      unknown     5173       12     5172                          
        total    28129     7600    19664    16532    15675      856
 
 objects
               views:      104         viewrootimpl:        1
         appcontexts:        4           activities:        1
              assets:        2        assetmanagers:        2
       local binders:       15        proxy binders:       19
    death recipients:        0
     openssl sockets:        0
 
 sql
         memory_used:     1468
  pagecache_overflow:      899          malloc_size:      168
 
 databases
      pgsz     dbsz   lookaside(b)          cache  dbname
         4     1180             68        54/55/9  /data/data/com.android.browser/databases/browser2.db
         4     1180             25         1/60/2  /data/data/com.android.browser/databases/browser2.db (2)
         4     1180             65        90/23/7  /data/data/com.android.browser/databases/browser2.db (1)
         4       40             18         0/15/1  /data/data/com.android.browser/databases/webview.db
 
 asset allocations
    zip:/system/app/browser.apk:/resources.arsc: 881k

dumpsys的输出结果在不同版本的android系统可能不同。

其中pss total是程序占用的pss。

3.检查程序状态

liuhx@uc ~ $ adb shell cat /proc/939/status
name: android.browser
state: s (sleeping)
tgid: 939
pid: 939
ppid: 38
tracerpid: 0
uid: 10013 10013 10013 10013
gid: 10013 10013 10013 10013
fdsize: 256
groups: 1015 1028 3003 50013
vmpeak:   215504 kb
vmsize:   206780 kb
vmlck:        0 kb
vmhwm:    52108 kb
vmrss:    47748 kb
vmdata:    53616 kb
vmstk:       84 kb
vmexe:        8 kb
vmlib:    29300 kb
vmpte:      156 kb
threads: 29
sigq: 0/6656
sigpnd: 0000000000000000
shdpnd: 0000000000000000
sigblk: 0000000000001204
sigign: 0000000000000000
sigcgt: 00000002000094e8
capinh: 0000000000000000
capprm: 0000000000000000
capeff: 0000000000000000
capbnd: fffffffffffffeff
voluntary_ctxt_switches: 451
nonvoluntary_ctxt_switches: 3563

vmrss是程序占用的rss

4.检查程序各部分的内存占用。

cat /proc/939/smaps

这个命令的输出结果很长，下面是一部分结果：

4b399000-4b39b000 r--p 0001d000 1f:00 560        /system/lib/libglesv1_enc.so
size:                  8 kb
rss:                   8 kb
pss:                   8 kb
shared_clean:          0 kb
shared_dirty:          0 kb
private_clean:         0 kb
private_dirty:         8 kb
referenced:            8 kb
swap:                  0 kb
kernelpagesize:        4 kb
mmupagesize:           4 kb
4b39b000-4b39c000 rw-p 0001f000 1f:00 560        /system/lib/libglesv1_enc.so
size:                  4 kb
rss:                   4 kb
pss:                   4 kb
shared_clean:          0 kb
shared_dirty:          0 kb
private_clean:         0 kb
private_dirty:         4 kb
referenced:            4 kb
swap:                  0 kb
kernelpagesize:        4 kb
mmupagesize:           4 kb