* stream based live time synchronized tracing?
@ 2022-08-15 13:28 Alexander Aring
2022-08-15 15:02 ` Mathieu Desnoyers
2022-08-16 22:05 ` Steven Rostedt
0 siblings, 2 replies; 3+ messages in thread
From: Alexander Aring @ 2022-08-15 13:28 UTC (permalink / raw)
To: linux-trace-users
Hi,
I am curious if there is any way of getting time synchronized traces
in a kind of stream based communication like pipes, sockets, etc. and
get high level event representation as ?libtraceevent? provides. I
would like to get all "merged" events from all machines provided by -A
parameters. I think it isn't required to get them in order, but the
timestamp should be synchronized.
I could probably build something like that with libtracecmd to have it
directly implemented in an application, but I am curious if there
exists any interest in having such a feature upstream? E.g. having
additional parameters like '--tsync-interval'.
A use-case would be live capturing of time synchronized events or what
I have in my mind to collect stats and doing kernel runtime
optimizations.
- Alex
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: stream based live time synchronized tracing?
2022-08-15 13:28 stream based live time synchronized tracing? Alexander Aring
@ 2022-08-15 15:02 ` Mathieu Desnoyers
2022-08-16 22:05 ` Steven Rostedt
1 sibling, 0 replies; 3+ messages in thread
From: Mathieu Desnoyers @ 2022-08-15 15:02 UTC (permalink / raw)
To: Alexander Aring; +Cc: linux-trace-users
----- On Aug 15, 2022, at 9:28 AM, Alexander Aring aahringo@redhat.com wrote:
> Hi,
>
> I am curious if there is any way of getting time synchronized traces
> in a kind of stream based communication like pipes, sockets, etc. and
> get high level event representation as ?libtraceevent? provides. I
> would like to get all "merged" events from all machines provided by -A
> parameters. I think it isn't required to get them in order, but the
> timestamp should be synchronized.
>
> I could probably build something like that with libtracecmd to have it
> directly implemented in an application, but I am curious if there
> exists any interest in having such a feature upstream? E.g. having
> additional parameters like '--tsync-interval'.
>
> A use-case would be live capturing of time synchronized events or what
> I have in my mind to collect stats and doing kernel runtime
> optimizations.
You may want to have a look at babeltrace2 [1]. It allows merging multiple
traces together as they are read. Using the "lttng-live" source, you can read
traces as they are produced.
Thanks,
Mathieu
[1] https://babeltrace.org
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: stream based live time synchronized tracing?
2022-08-15 13:28 stream based live time synchronized tracing? Alexander Aring
2022-08-15 15:02 ` Mathieu Desnoyers
@ 2022-08-16 22:05 ` Steven Rostedt
1 sibling, 0 replies; 3+ messages in thread
From: Steven Rostedt @ 2022-08-16 22:05 UTC (permalink / raw)
To: Alexander Aring; +Cc: linux-trace-users
On Mon, 15 Aug 2022 09:28:48 -0400
Alexander Aring <aahringo@redhat.com> wrote:
> Hi,
>
> I am curious if there is any way of getting time synchronized traces
> in a kind of stream based communication like pipes, sockets, etc. and
> get high level event representation as ?libtraceevent? provides. I
> would like to get all "merged" events from all machines provided by -A
> parameters. I think it isn't required to get them in order, but the
> timestamp should be synchronized.
Are these for guests, or machines on a network?
>
> I could probably build something like that with libtracecmd to have it
> directly implemented in an application, but I am curious if there
> exists any interest in having such a feature upstream? E.g. having
> additional parameters like '--tsync-interval'.
>
> A use-case would be live capturing of time synchronized events or what
> I have in my mind to collect stats and doing kernel runtime
> optimizations.
So basically not save to a file? Just record the events live and interleave
them for different machines?
I'm not exactly sure what you are asking for. Can you please elaborate some
more?
Thanks,
-- Steve
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-08-15 15:02 ` Mathieu Desnoyers
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