On 2023-02-15 04:09, Rengar Stinkt via lttng-dev wrote:
Dear community,
I only recently started working with lttng tracing due to work related
projects, so I am very new to this. I have done some research before
posting this but I can't seem to find an answer.
I am running several CPU load tests for specific processes on different
devices using lttng and TraceCompass for visualization. I am running
into the issue that 99.9% of traced processes are not of value to me and
the tracing files get extremely big and hard to work with (filtering
with TraceCompass is very slow).
Now I thought of filtering the processes before tracing and I found
filtering by PID and TID. The issue with this is that the PIDs and TIDs
are unique on each device but change between devices.
I then found the command "htop -d 0.1 -u **String**" to see currently
running processes with a certain name.
Now if I run this it shows me the running process IF they are running. I
have time triggered and event triggered processes. There are many
inconvenient workarounds to make it work, like triggering the events and
finding out the PID and then manually copying all of the IDs and pasting
them into "lttng track --kernel --pid=""". But I am trying to find a way
to either filter by name right away, avoiding relying on PIDs or at
least to have an automated process of doing it. But I am unfamiliar with
running code in the PuTTY terminal that we are using, so I am trying to
avoid this (for now). If this is the only option though, I will have to
look into it.
Is there any way to filter by name right away like in the mentioned htop
command?
Thank you so much in advance.
This would be:
lttng enable-event -k event_name --filter '$ctx.procname == "string"'
Where "string" can include wildcards as well.
Hoping this helps,
Mathieu
Dom
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--
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com
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