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