[ltt-dev] No trace data inside the trace folders

[david.goulet@polymtl.ca (David Goulet)]

Hi Srivatsan,

If usttrace give you no trace directory it's because their was no data 
recorded by the tracer. It's like tracing an application that does not 
contain UST instrumentation. For example :

$ usttrace ls

will output only app.log and ust-consumerd.log and no data.

However, I saw that you are using a very simple test case :

#include <ust/marker.h>
int main(int argc, char **argv)
{
trace_mark(main,myevent,"%d", getpid());
}

This should actually work fine with the latest UST release (0.11). 
However, using the channel "main" will not produce data for you. At this 
point, only the channel "ust" is supported.

If you still don't get the directory containing data, maybe try the 
latest git head of UST.

Thanks!
David


On 11-02-15 03:06 PM, Srivatsan Vijayaraghavan wrote:
> I am very sorry to have misled all of you. I used the ellipsis to mean
> some path name and my host name and date string are indeed fine. It's
> really the trace folder which is missing even when I specify it
> explicitly using the -o option, it stops after creating app.log and
> ust-consumerd.log, there is no trace folder inside my trace directory.
>
> pwd - /usr/local/bin
> usttrace -o /usr/local/bin/traceapp ./testust
> - Waiting for ust-consumerd to shutdown...
> - Trace was output in /usr/local/bin/traceapp
>
> Then i went to inspect the trace output only to find app.log and
> ust-consumerd.log inside /usr/local/bin/traceapp.
>
> ls /usr/local/bin/traceap showed me only app.log and ust-consumerd.log
>
> Thanks,
> Srivatsan V
>
> --- On *Tue, 2/15/11, Mathieu Desnoyers /<compudj at krystal.dyndns.org>/*
> wrote:
>
>
>     From: Mathieu Desnoyers <compudj@krystal.dyndns.org>
>     Subject: Re: [ltt-dev] No trace data inside the trace folders
>     To: "Srivatsan Vijayaraghavan" <srivatsanvijayaraghavan at yahoo.com>
>     Cc: ltt-dev at lists.casi.polymtl.ca
>     Date: Tuesday, February 15, 2011, 7:06 PM
>
>     * Srivatsan Vijayaraghavan (srivatsanvijayaraghavan at yahoo.com
>     </mc/compose?to=srivatsanvijayaraghavan at yahoo.com>) wrote:
>      > case 1 - usttrace ./testust
>      > no -o option switch to specify trace directory and I get
>      > /root/.usttracers/.../ust-consumerd.log - No such file or directory
>
>     Ah, "..." is the problem. It's not a valid path name.
>
>     The following usttrace code seems problemstic on your system:
>
>     # Create directory for trace output
>     if [ -n "$OUTPUT_DIR" ]; then
>     OUTDIR=$OUTPUT_DIR
>     else
>     DATESTRING="$(hostname)-$(date +%Y%m%d%H%M%S%N)"
>     OUTDIR="$BASE_TRACE_DIR/$DATESTRING"
>     fi
>
>     So your commands "hostname" and "date" are missing.
>
>     Mathieu
>
>      >
>      > case 2 - usttrace -o ./trace ./testust
>      > I specified the output directory for the trace and the two files
>     app.log, ust-consumerd.log are now created in ./tracedir, but when I
>     tried to inspect the folder for the actual trace, there was no
>     tracing done or the folder where the trace data is kept was not
>     there inside ./tracedir
>      >
>      > On the console-
>      > > Waiting for ust-consumerd to shutdown...
>      > > Trace was output in: ./tracedir
>      > sh-2.05b# cd tracedir
>      > -sh-2.05b# ls
>      > > app.log ust-consumerd.log
>      >
>      > Thanks,
>      > Srivatsan
>      > --- On Tue, 2/15/11, Mathieu Desnoyers
>     <compudj at krystal.dyndns.org
>     </mc/compose?to=compudj at krystal.dyndns.org>> wrote:
>      >
>      > From: Mathieu Desnoyers <compudj@krystal.dyndns.org
>     </mc/compose?to=compudj at krystal.dyndns.org>>
>      > Subject: Re: [ltt-dev] No trace data inside the trace folders
>      > To: "Srivatsan Vijayaraghavan" <srivatsanvijayaraghavan at yahoo.com
>     </mc/compose?to=srivatsanvijayaraghavan at yahoo.com>>
>      > Cc: ltt-dev at lists.casi.polymtl.ca
>     </mc/compose?to=ltt-dev at lists.casi.polymtl.ca>
>      > Date: Tuesday, February 15, 2011, 2:00 PM
>      >
>      > what is the "the same /root/.usttracers/..../ust-consumerd.log -
>     No such
>      > file or directory" exactly ? Which path is it unable to create ? Have
>      > you tried creating it by hand ?
>      >
>      > Thanks,
>      >
>      > Mathieu
>      >
>      > * Srivatsan Vijayaraghavan (srivatsanvijayaraghavan at yahoo.com
>     </mc/compose?to=srivatsanvijayaraghavan at yahoo.com>) wrote:
>      > > -sh-2.05b# usttrace -o ./tracedir ./testUST
>      > > ./tracedir
>      > > Waiting for ust-consumerd to shutdown...
>      > > Trace was output in: ./tracedir
>      > > -sh-2.05b# pwd
>      > > /usr/local/bin
>      > > -sh-2.05b# cd tracedir
>      > > -sh-2.05b# ls
>      > > app.log ust-consumerd.log
>      > >
>      > > If I dont give the trace directory, the it fails to create the
>     ust-consumerd.log file.
>      > >
>      > > Thanks,
>      > > Srivatsan
>      > > --- On Tue, 2/15/11, Mathieu Desnoyers
>     <compudj at krystal.dyndns.org
>     </mc/compose?to=compudj at krystal.dyndns.org>> wrote:
>      > >
>      > > From: Mathieu Desnoyers <compudj@krystal.dyndns.org
>     </mc/compose?to=compudj at krystal.dyndns.org>>
>      > > Subject: Re: [ltt-dev] Trouble tracing my application for
>     PowerPC board
>      > > To: "Srivatsan Vijayaraghavan"
>     <srivatsanvijayaraghavan at yahoo.com
>     </mc/compose?to=srivatsanvijayaraghavan at yahoo.com>>
>      > > Cc:
>      > > ltt-dev at lists.casi.polymtl.ca
>     </mc/compose?to=ltt-dev at lists.casi.polymtl.ca>
>      > > Date: Tuesday, February 15, 2011, 4:34 AM
>      > >
>      > > * Srivatsan Vijayaraghavan (srivatsanvijayaraghavan at yahoo.com
>     </mc/compose?to=srivatsanvijayaraghavan at yahoo.com>) wrote:
>      > > > I used ltib to cross compile and build liburcu and libust on
>     my target board (for powerpc). Everything went smooth with few
>     glitches which were sorted out, but when I tried to trace my
>     application by invoking it from usttrace (usttrace ./testust), I
>     wasn't able to get beyond this message
>      > > > /root/.usttracers/...../ust-consumerd.log - No such file or
>     directory
>      > > >
>      > > > I tried recording the trace manually when ust-consumerd
>     failed in epoll_create().
>      > > > So I built the kernel with CONFIG_EPOLL support, but that did
>     not help. I still get the same
>     /root/.usttracers/..../ust-consumerd.log - No such file or directory
>      > > >
>      > >
>      > > > ---testust.cpp---
>      > > > #include <ust.marker.h>
>      > > > int main(..)
>      > > > {
>      > > > trace_mark(main,myevent,"%d", getpid());
>      > > > }
>      > >
>      > > which user ID are your running your application as ?
>      > >
>      > > What's the value of your $HOME ?
>      > >
>      > > It looks like ust is unable to create the directories/files
>     needed to
>      > > write the log file. It looks like an access right problem
>      > >
>      > > Mathieu
>      > >
>      > > >
>      > > > Thanks,
>      > > > Srivatsan V
>      > > >
>      > > >
>      > > >
>      > > >
>      > > >
>      > > >
>     ____________________________________________________________________________________
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>      > >
>      > >
>      > > --
>      > > Mathieu Desnoyers
>      > > Operating System Efficiency R&D Consultant
>      > > EfficiOS Inc.
>      > > http://www.efficios.com
>      > >
>      > >
>      > >
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>      > --
>      > Mathieu Desnoyers
>      > Operating System Efficiency R&D Consultant
>      > EfficiOS Inc.
>      > http://www.efficios.com
>      >
>      >
>      >
>      >
>      >
>     ____________________________________________________________________________________
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>     Mathieu Desnoyers
>     Operating System Efficiency R&D Consultant
>     EfficiOS Inc.
>     http://www.efficios.com
>
>
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-- 
David Goulet
LTTng project, DORSAL Lab.

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