Is there a tool somewhere that lets me monitor a single process?

Something I'd run, passing it a PID and which would display a regularly refreshed status of what the process is doing: MB/s read from the
filesystem, MB/s written to the filesystem, maybe even with more detail
(actual file name(s) accessed maybe summarized as directories if there
are too many), same thing for the network, amount of CPU being used,
ideally even some indication of "where" that CPU time is spent
(e.g. among the mmaped files containing code, which one contains the
code where we're spending most of the time?).
Also, percentage of time spent waiting (and if so, waiting for what
kind of resource, ...)?

`strace` gives enough data to compute at least part of the above info,
so it seems doable, but I haven't seen any reference to such a tool pass
by my desk over the years. What am I missing?


Stefan

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On Tue, Jan 07, 2025 at 09:08:52AM -0500, Stefan Monnier wrote:

Is there a tool somewhere that lets me monitor a single process?

Look at pidstat in the sysstat package. I think you'll need multiple
tools to get everything you're looking for, e.g., maybe lsof.

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On Tue, 07 Jan 2025 09:08:52 -0500
Stefan Monnier <monnier@iro.umontreal.ca> wrote:

Is there a tool somewhere that lets me monitor a single process?

[...]

`strace` gives enough data to compute at least part of the above info,
so it seems doable, but I haven't seen any reference to such a tool
pass by my desk over the years. What am I missing?

Without a solution, but at least an idea:

You could write your own customized shell script to extract any
information you'd like to have, and then run this script with a
wrapper tool like ``watch''.
--
kind regards
Frank

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On Tue, Jan 07, 2025 at 10:25:02AM -0500, Michael Stone wrote:

On Tue, Jan 07, 2025 at 09:08:52AM -0500, Stefan Monnier wrote:

Is there a tool somewhere that lets me monitor a single process?

Look at pidstat in the sysstat package. I think you'll need multiple
tools to get everything you're looking for, e.g., maybe lsof.

look at fatrace also

--- SoupGate-Win32 v1.05
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Stefan Monnier wrote:

Is there a tool somewhere that lets me monitor a single process?

Something I'd run, passing it a PID and which would display a regularly refreshed status of what the process is doing: MB/s read from the
filesystem, MB/s written to the filesystem, maybe even with more detail (actual file name(s) accessed maybe summarized as directories if there
are too many), same thing for the network, amount of CPU being used,
ideally even some indication of "where" that CPU time is spent
(e.g. among the mmaped files containing code, which one contains the
code where we're spending most of the time?).
Also, percentage of time spent waiting (and if so, waiting for what
kind of resource, ...)?

htop is in Stable and can be narrowed down to one user or one
process ID via command line flags.

-dsr-

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Thank you for all your answers, this pointed me to tools I was not aware
of and to options I was not aware of in tools I knew.

`lsof` seems able to give me a lot of info, but has so many options that
I haven't yet found a way to give me something more or less useful.
But at least I now know that it can do a lot more than tell me who's
preventing me from unmounting a filesystem. 🙂

`pidstat`, `htop`, and `iotop` are closer to what I was imagining, but
they're also coarser. And AFAICT none of them give me info about the
network activity, focusing on CPU/MEM/DISK only.

One of my main uses is when a tool is sitting there without giving me
any feedback and I'm wondering what it is that it's doing.
E.g. recently this occurred with `bup`, where I wanted to see if it was
mostly talking to the remote `bup`, or mostly reading local files or
writing local files (so as to guess in which phase
it is, and whether it's making progress), or none of the above
(e.g. because the network connection got stuck).


Stefan

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On 2025-01-16, Stefan Monnier wrote:

E.g. recently this occurred with `bup`, where I wanted to see if it was mostly talking to the remote `bup`, or mostly reading local files or
writing local files (so as to guess in which phase
it is, and whether it's making progress), or none of the above
(e.g. because the network connection got stuck).

For activity perhaps :
watch ip stats show dev eth0 group link

For freeze somewhere on the road :
ping -n www.debian.org
or more detailed
mtr -n www.debian.org

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