[ltt-dev] simultaneous lttng kerner tracer and userspace tracer

[Mathieu Desnoyers]

* MEKEZE KWATCHO, PATRICK (PATRICK) (patrick.mekeze_kwatcho at alcatel-lucent.com) wrote:
> 
> Yes, I see well the kernel event and the testprogramm process when I analyze the trace1 get with $ lttctl -C -w /tmp/trace1 trace1
> 
> I also think that is it possible to start a userspace trace without using the usttrace tool.
> When I run $usttrace ./testprogramm and $ lttctl -C -w /tmp/trace1 trace1, I saw on the lttv-gui all the kernel event, but i didn't see my userspace event.
> Among the process, both usttrace and testprogramm are present.

How do you start lttv-gui ?

Something like:

lttv-gui -t path_to_kernel_trace -t path_to_ust_trace

would be appropriate. Also make sure to look at the usttrace source code
to select the kernel-lttng-compatible trace clock rather than
gettimeofday. If you don't change that, the kernel and userspace data
won't be aligned on the same timeline.

Thanks,

Mathieu

> 
> Thank,
> Patrick
> 
> -----Message d'origine-----
> De : Holger brunck [mailto:holger.brunck at keymile.com] 
> Envoyé : jeudi 10 juin 2010 12:47
> À : MEKEZE KWATCHO, PATRICK (PATRICK)
> Cc : ltt-dev at lists.casi.polymtl.ca
> Objet : Re: [ltt-dev] simultaneous lttng kerner tracer and userspace tracer
> 
> Hi,
> 
> On 06/10/2010 11:09 AM, MEKEZE KWATCHO, PATRICK (PATRICK) wrote:
> > 
> > Could someone help me about this subject?
> > 
> > 
> > Today's Topics:
> > 
> >    1. Run simultaneous lttng kerner tracer and userspace tracer
> >       (patrick mekeze)
> > 
> > 
> > I am a high school student and it is now about one month that i decided to interest on lttng projet because i was searching about some metric tools for unix systems. 
> > The goal of my research is to develop a tool which would work as a "fligth recover " for a unix system running on a power PC hardward support.
> > i decided to work for the first time on an?intel processor and after, i will make a croos compilation for my target which is a power PC processor
> > I have already built a linux kernel with the lttng patch and i have install all the need tool to have a lttv analyser 
> > Because i would like to trace some programm running on userspace, i have install usttrace tool.
> > After this i wrote a short application with a marker inside as i see in the usttrace tutorial available on website.
> > When i run this with command $usttrace ./testprogramm , i have in the promt the name of directory where trace are logged and i can use lttv to analyze it. here i can see well my event "myevent" on the wiever.
> > But? when i activated kernel trace with command $ lttctl -C -w /tmp/trace1 trace1, and run my userspace programm with command $ ./testprogramm,?i am not?able to get the myevent.
> > so that, i want to know how tu run lttctl tools and userspace programm to get and analyze simultaneous on the lttv-gui? ,kernel event and userspace event.
> > 
> 
> I never used both tracing mechanism at the same time, but two questions come in
> my mind.
> 
> 1) Do you see the kernel trace events, or do you see nothing?
> 2) Are you sure that in the second case you have to start  your testprogram
> without usttrace? Did you tried to $usttrace ./testprogramm and $ lttctl -C -w
> /tmp/trace1 trace1?
> 
> Best regards
> Holger Brunck
> 
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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com