是否可以通过使用psutil或任何其他Python包来获取同级进程的PID？

Question

I am running a set of parallel computing.

I am trying to use psutil to track the computation (If someone has a better solution, plz tell me)

>>> p = psutil.Process(4370)
>>> p.cpu_percent()
0.0
>>> p.cpu_times()
pcputimes(user=6440.78, system=5.4, children_user=0.0, children_system=0.0)
>>> p.cpu_affinity()
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
>>> p.cpu_num()
2 

I guess the last one get a value of 2 for p.cpu_num() indicates that this job is on parallel computing, there is another sibling process doing the computing simultaneously.

Is it possible to get the PID of the sibling process by using psutil or any other Python packages?

Answer 1

" I guess the last one get a value of 2 for p.cpu_num() indicates that this job is on parallel computing "

No, this does not mean anything other but that a process p is currently mapped onto the second CPU from all CPU-s available ( O/S task scheduler decides on which CPU/core a job is going to get executed + the process-affinity settings may restrict such a choice )

>>> print( p.cpu_num.__doc__ )
Return what CPU this process is currently running on.
            The returned number should be <= psutil.cpu_count()
            and <= len(psutil.cpu_percent(percpu=True)).
            It may be used in conjunction with
            psutil.cpu_percent(percpu=True) to observe the system
            workload distributed across CPUs.

Q : Is it possible to get the PID of the sibling process by using psutil

Yes, it is. How? It is quite enough to follow the documentation to assemble any traversing tree strategy that meets your needs and expectations upto a system-level universal process-monitor.

>>> aParentOfThisPROCESS = psutil.Process( thisProcess.parent().pid )
>>> aParentOfThisPROCESS.threads()
6
>>> aParentOfThisPROCESS.open_files()
[popenfile(path='/XXXXXXXXXXXXXXXX', fd=8, position=0, mode='r', flags=32768)]

>>> print( aParentOfThisPROCESS.children.__doc__ )
Return the children of this process as a list of Process
        instances, pre-emptively checking whether PID has been reused.
        If *recursive* is True return all the parent descendants.

        Example (A == this process):

         A ─┐
            │
            ├─ B (child) ─┐
            │             └─ X (grandchild) ─┐
            │                                └─ Y (great grandchild)
            ├─ C (child)
            └─ D (child)

        >>> import psutil
        >>> p = psutil.Process()
        >>> p.children()
        B, C, D
        >>> p.children(recursive=True)
        B, X, Y, C, D

        Note that in the example above if process X disappears
        process Y won't be listed as the reference to process A
        is lost.