Re: [Help-bash] The best way to monitor the number of concurrently running processes forked by a main bash script ?

[Peng Yu]

Thanks. When the forked processes finish quickly, how can an external
program ps keep track of them?

On Tue, Apr 2, 2019 at 6:15 AM Aleksey Tsalolikhin <address@hidden>
wrote:

> Could you monitor by parent process id?
>
> The "ps" man page documents the parent process id option:
>
>        --ppid pidlist
>               Select by parent process ID.  This selects the processes
> with a
>               parent process ID in pidlist.  That is, it selects processes
>               that are children of those listed in pidlist.
>
> In other words, *something* must be creating these processes -- use the
> PID of the *something*, and then you'll see all its children.  You could
> run your "ps" command using the "watch" utility, and it would show you the
> various children as they come and go.  (In your case, the PID of the bash
> script that is forking the children.)
>
> Best,
> -at
>
> On Sun, Mar 31, 2019 at 8:25 PM Peng Yu <address@hidden> wrote:
>
>> Hi,
>>
>> I want to monitor the number of concurrently running processes forked
>> from a bash script. I could use things like top. But I don't think
>> this can easily monitor the processes especially when processes finish
>> very quickly. Probably a way that is native to bash might be better.
>> Is it possible?
>>
>> What is the best way to monitor this info? Thanks.
>>
>> --
>> Regards,
>> Peng
>>
>>
>
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-- 
Regards,
Peng