How to (constantly) monitoring state of static library ?

Sergei_Shablovsky · Dec 20, 2023

Merry Christmas, FreeBSD Gurus!

1.
How to monitoring state of static library: CPU, memory, disk I/O, system calls, etc…?

2.
How to useful doing this once, on crone and constantly (mean with saving in rdd DB)…?

Thank You so much!

cracauer@ · Dec 20, 2023

You generally can't except by profiling and only counting those frames ending up in symbols in that library.

Eric A. Borisch · Dec 20, 2023

Sergei_Shablovsky said:
How to monitoring state of static library: CPU, memory, disk I/O, system calls, etc…?

Do you really mean a static library? As in a (libname.a) file that has to be compiled into a separate piece of software to do anything?

Just trying to make sure we’re answering the right question.

ralphbsz · Dec 21, 2023

Agree with Eric: They way I read your question, it makes no sense. A static library is a .a file. It doesn't use CPU, memory, or disk IO, until it is linked into an executable. At that point, the executable starts using this type of resource, and that can be monitored (difficultly).

Suggestion: Write a longer paragraph explaining what you are trying to accomplish, maybe then we'll understand. I know there is a language barrier here.

zirias@ · Dec 21, 2023

ralphbsz said:
Agree with Eric: They way I read your question, it makes no sense. A static library is a .a file. It doesn't use CPU, memory, or disk IO, until it is linked into an executable. At that point, the executable starts using this type of resource, and that can be monitored (difficultly).

It's not like this would be so much different with a shared lib though ...

ralphbsz said:
Suggestion: Write a longer paragraph explaining what you are trying to accomplish, maybe then we'll understand. I know there is a language barrier here.

Yes please. It certainly has this XY-problem-smell (talking about an attempted technical solution instead of the original problem to solve) right now

Sergei_Shablovsky · Dec 23, 2023

Eric A. Borisch said:
Do you really mean a static library? As in a (libname.a) file that has to be compiled into a separate piece of software to do anything?

Statically linked 64-bit binary, some sort of media streaming.

You may download and see inside the binary

Sergei_Shablovsky · Dec 23, 2023

ralphbsz said:
They way I read your question, it makes no sense.

ralphbsz said:
Suggestion: Write a longer paragraph explaining what you are trying to accomplish, maybe then we'll understand. I know there is a language barrier here.

Sorry my stupidness as a beginner in BSD world.

Phishfry · Dec 23, 2023

When I open the linked rocketaudioserver file I see a rc.d service daemon.
So I look there and see the executable.

procname="/usr/local/bin/rsas"

So use ps -ax and look for rsas

To monitor it further CPU, Memory = top

disk i/o of an application.... unsure but gstat does all disk I/O. Same with iostat.

Phishfry · Dec 23, 2023

Here is a better answer. Get PID info with ps -ax then:

procstat

man.freebsd.org

Sergei_Shablovsky · Dec 23, 2023

Phishfry said:
When I open the linked rocketaudioserver file I see a rc.d service daemon.
So I look there and see the executable.

So use ps -ax and look for rsas

Thank You for detailed reply and suggestion.

How to possible by sh(4) script receiving the set of values of used mem, cpu, interrupts/calls of this binary?

Like “mem 34Mb cpu 12%…” ?

Need to using this in conjunction with Prometheus/Telegraf/Grafana to monitoring the loading state of machine.

Phishfry said:
To monitor it further CPU, Memory = top

disk i/o of an application.... unsure but gstat does all disk I/O. Same with iostat.

I just using ready-to-go Prometheus/node_exporter module for this

Sergei_Shablovsky · Dec 24, 2023

Phishfry said:
Here is a better answer. Get PID info with ps -ax then:

procstat

man.freebsd.org

So each time after System start / restart, because PID given to RSAS randomly, before I using procstat, I need each time using “ps -ax” ?

Phishfry · Dec 24, 2023

Well if your willing to turn off a security feature you can have static PIDs and skip a step.
Random PIDs is a security feature.

Phishfry · Dec 24, 2023

Great suggestions here:

Solved - How to disable random PID?

During installation, I choose to randomize PID for security, now found that PID is randomized everytime, so I can't kill some process by its pid. How to disable random PID?

forums.freebsd.org

shkhln · Dec 24, 2023

The easiest way to get the PID is to spawn something:

Code:

% echo $$
2592
% exec sh
$ echo $$
2592
$ exec csh
% echo $$
2592

That said, OP would be better served with jails.

Sergei_Shablovsky · Dec 24, 2023

Phishfry said:
Well if your willing to turn off a security feature you can have static PIDs and skip a step.
Random PIDs is a security feature.

I prefer to keep PID randomly.

Sergei_Shablovsky · Dec 24, 2023

shkhln said:
The easiest way to get the PID is to spawn something:

Code:

% echo $$ 2592 % exec sh $ echo $$ 2592 $ exec csh % echo $$ 2592

That said, OP would be better served with jails.

So You sure

% exec rsas
$ echo $$

would give me exactly the RSAS PID?

Phishfry · Dec 24, 2023

Why not use what SirDice and zirias@ alluded to:

SirDice said:
The best solution is to use the PID file of the process (daemons typically create these),

Emphasis mine.

zirias@ said:
A daemon will write a pidfile (typically in /var/run) or provide an option to do that. Use that file.

Eric A. Borisch · Dec 24, 2023

If the daemon has a pid file, as mentioned above, use that, otherwise consider pgrep(1).