On Fri, Mar 3, 2017 at 11:54 PM, Ralph Corderoy <ra...@inputplus.co.uk> wrote:
> Hi,
>
> Second request. I had a bunch of filename.pid outputs from -ff the
> other day and to better understand what occurred, I examined and renamed
> them to show their ancestry.
>
> 1000.man
> 1008.man-preconv
> 1009.man-tbl
> 1010.man-nroff
> 1011.man-col
> 1013.man-nroff-locale
> 1016.man-nroff-groff
> 1018.man-nroff-groff-troff
> 1019.man-nroff-groff-grotty
>
> I was thinking something similar could happen automatically. Not using
> the name of the program execve()'d, because that comes later, but a list
> of PIDs starting with the ancestor. So
>
> strace -o foo -fff /usr/bin/foo
>
> might produce
>
> foo.100
>
> and as that forks
>
> foo.100-102
>
> and forks again
>
> foo.100-102-103
>
> foo.100-109 would be 102's sibling.
>
> It would make it that bit easier when grep-ing through them all, etc.,
> to interpret the results.
Well, something like { echo 'digraph {'; for i in *; do sed -n
"/clone/s/.* \([0-9]*\)\$/${i#*.} -> \1;/p" $i; done; echo '}'; } |
dot -Tpng > pid_graph.png can ease the task, but it is not always
that easy [1]. Thanks for the sugestion, since strace indeed can track
this sort of process relations.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1035433
> --
> Cheers, Ralph.
> https://plus.google.com/+RalphCorderoy
>
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Eugene Syromyatnikov
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