The proc pseudo file system, which resides in /proc directory, is the easiest way to see the thread count of any active process. The /proc directory exports in the form of readable text files a wealth of information related to existing processes and system hardware such as CPU, interrupts, memory, disk, etc.
cat /proc/<pid>/status
The proc pseudo file system, which resides in /proc directory, is the easiest way to see the thread count of any active process. The /proc directory exports in the form of readable text files a wealth of information related to existing processes and system hardware such as CPU, interrupts, memory, disk, etc.
Threads: <N>
For example Find the pid of the google chrome and find the each process using how many Threads.
root@linuxforfreshers.com:~# ps -ef | grep chrome
root 28168 20969 1 15:45 ? 00:00:17 /opt/google/chrome/chrome
Where 28168 is pid of google chrmoe.
Or
root@linuxforfreshers.com:~# pidof chrome
28168
Example :
root@linuxforfreshers.com:~# cat /proc/28168/status
Name: chrome
State: S (sleeping)
Tgid: 28168
Ngid: 0
Pid: 28168
PPid: 20969
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
FDSize: 256
Groups: 4 24 27 30 46 108 124 128 1000
NStgid: 28168 12008 1
NSpid: 28168 12008 1
NSpgid: 3938 0 0
NSsid: 3938 0 0
VmPeak: 1087572 kB
VmSize: 1028908 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 311332 kB
VmRSS: 212288 kB
VmData: 606664 kB
VmStk: 136 kB
VmExe: 109204 kB
VmLib: 45784 kB
VmPTE: 1676 kB
VmPMD: 620 kB
VmSwap: 8520 kB
HugetlbPages: 0 kB
Threads: 15
SigQ: 0/15451
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000001002
SigCgt: 00000001c0014efd
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: 0000003fffffffff
CapAmb: 0000000000000000
Seccomp: 2
Cpus_allowed: 3
Cpus_allowed_list: 0-1
Mems_allowed: 00000000,00000001
Mems_allowed_list: 0
voluntary_ctxt_switches: 32357
nonvoluntary_ctxt_switches: 18926
Or
root@linuxforfreshers.com:~# cat /proc/28168/status | grep Threads
Threads: 15
Method 2: Using ls command
syntax:
ls /proc/<pid>/task | wc -l
This is because, for every thread created within a process, there is a corresponding directory created in /proc/<pid>/task, named with its thread ID. Thus the total number of directories in /proc/<pid>/task represents the number of threads in the process.
Example:
root@linuxforfreshers.com:~# ls /proc/28168/task/ | wc -l
15
Method 3: Using ps command
Syntax:
ps huH p <PID_OF_U_PROCESS> | wc -l
Example :
root@linuxforfreshers.com:~# ps huH p 28168 | wc -l
15
Method 4:
Syntax: ps -eT | grep <PID_of_process> | wc -l
Example :
root@linuxforfreshers.com:~# ps -eT | grep 28168 | wc -l
15
