[移动开发]Android 查看当前应用的线程数是否超限

1.查看某个应用(以com.wwy.setup为例)的进程号

使用包名查找 adb shell "ps | grep packageName“，packageName 也可以是包名的一部分进行模糊查找。

C:\Users\user>adb shell "ps |grep com.wwy.setup"
u0_a39       14985 13378 32836072 217984 SyS_epoll_wait     0 S com.wwy.setup

或者使用adb shell ps直接列出所有的进程，总共3万多个，截取一部分如下：

C:\Users\user>adb shell ps
USER           PID  PPID     VSZ    RSS WCHAN            ADDR S NAME
root             1     0 11044512 14176 SyS_epoll_wait      0 S init
root             2     0       0      0 kthreadd            0 S [kthreadd]
root             4     2       0      0 worker_thread       0 I [kworker/0:0H]
root             6     2       0      0 rescuer_thread      0 I [mm_percpu_wq]
root             7     2       0      0 smpboot_thread_fn   0 S [ksoftirqd/0]
root             8     2       0      0 rcu_gp_kthread      0 I [rcu_preempt]
root             9     2       0      0 rcu_gp_kthread      0 I [rcu_sched]
root            10     2       0      0 rcu_gp_kthread      0 I [rcu_bh]
root            11     2       0      0 smpboot_thread_fn   0 S [migration/0]
root            12     2       0      0 smpboot_thread_fn   0 S [cpuhp/0]

......

u0_a112      14633 13378 15478532 60584 SyS_epoll_wait      0 S com.google.process.gservices
u0_a116      14883 13378 33871964 191148 SyS_epoll_wait     0 S com.google.android.googlequicksearchbox:search
u0_a39       14985 13378 32836072 217980 SyS_epoll_wait     0 S com.wwy.setup

......
u0_a112      19165 13378 16084008 156408 SyS_epoll_wait     0 S com.google.android.gms
root         19296     2       0      0 worker_thread       0 I [kworker/6:0]
u0_a105      19502 13378 16234924 108956 SyS_epoll_wait     0 S com.android.vending
root         19664     2       0      0 rescuer_thread      0 I [kbase_event]
root         19681     2       0      0 rescuer_thread      0 I [fs_suspend_syss]
u0_a97       19747 13378 15245940 94156 SyS_epoll_wait      0 S com.tblenovo.tabpushout
u0_a33       24509 13378 15247992 76184 SyS_epoll_wait      0 S android.process.acore
u0_a124      24552 13378 15603428 89960 SyS_epoll_wait      0 S com.google.android.tts
root         32659     2       0      0 worker_thread       0 I [kworker/u16:6]

其中PID就是进程号，所以我们的目标应用com.wwy.setup的进程号就是 14985

2.查看当前进程运行的线程数

cat proc/{pid}/status

C:\Users\user>adb shell
TBDEVICE:/ # cat proc/14985/status
Name:   .wwy.setup
Umask:  0077
State:  S (sleeping)
Tgid:   14985
Ngid:   0
Pid:    14985
PPid:   13378
TracerPid:      0
Uid:    10039   10039   10039   10039
Gid:    10039   10039   10039   10039
FDSize: 512
Groups: 3003 9997 20039 50039
NStgid: 14985
NSpid:  14985
NSpgid: 13378
NSsid:  0
VmPeak: 33220564 kB
VmSize: 32836072 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:    222104 kB
VmRSS:    217984 kB
RssAnon:           40588 kB
RssFile:          175956 kB
RssShmem:           1440 kB
VmData:  1870460 kB
VmStk:      8192 kB
VmExe:        12 kB
VmLib:    254636 kB
VmPTE:      1568 kB
VmPMD:        80 kB
VmSwap:    43000 kB
Threads:        54
SigQ:   0/28719
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000080001204
SigIgn: 0000000000000001
SigCgt: 0000006e400004f8
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: 0000000000000000
CapAmb: 0000000000000000
NoNewPrivs:     0
Seccomp:        2
Speculation_Store_Bypass:       thread vulnerable
Cpus_allowed:   0f
Cpus_allowed_list:      0-3
Mems_allowed:   1
Mems_allowed_list:      0
voluntary_ctxt_switches:        32531
nonvoluntary_ctxt_switches:     13398

从上面 Threads: ? ? ? ?54? 可知运行线程数是54

3.查看系统对每个进程的线程数限制

C:\Users\user>adb shell
TBDEVICE:/ # cat /proc/sys/kernel/threads-max
57439

cat /proc/sys/kernel/threads-max，针对不同设备的结果不同，一般情况下，低端机型threads-max比较小，当某一应用的线程数超过threads-max容易出现oom问题。

如果Threads数超出规定的上限，我们就必须考虑怎么去降低线程数了，进行线程优化。

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