[ltt-dev] no channel available - IBM BlueGene cluster

[Mathieu Desnoyers]

* Alessandro Morari (amorari at us.ibm.com) wrote:
> 
> Hi,
> 
> I'm installing LTTng on a BlueGene/P cluster, with Linux 2.6.29.1,
> patch-2.6.29.1-lttng-0.124 and ltt-control-0.75-15112-2009.
> After installing the patch and compiling the daemon, I run:

First make sure all the LTTng probe modules are loaded, and also ensure
that you run "ltt-armall" before using lttctl.

Please refer to the LTTng Manual on the lttng.org website for details.

Thanks,

Mathieu

> 
> > lttctl -C -w ~/trace1 trace1
> And I obtain:
> >Linux Trace Toolkit Trace Control 0.75-15112009
> >
> >Controlling trace : trace1
> >
> >lttctl: Creating trace
> >lttctl: Forking lttd
> >Linux Trace Toolkit Trace Daemon 0.75-15112009
> >
> >Reading from debugfs directory : /mnt/debugfs/ltt/trace1
> >Writing to trace directory : /root/trace1
> >
> >lttctl: Starting trace
> and then I do the command:
> >lttctl -D -w ~/trace1 trace1
> and I obtain :
> >Linux Trace Toolkit Trace Control 0.75-15112009
> >
> >Controlling trace : trace1
> >
> >lttctl: Pausing trace
> >lttctl: Forking lttd
> >Linux Trace Toolkit Trace Daemon 0.75-15112009
> >
> >Reading from debugfs directory : /mnt/debugfs/ltt/trace1
> >Writing to trace directory : /root/trace1
> >
> >No channel available for reading, exiting
> >lttd process running failed
> >
> >
> /mnt/debugfs/ltt/control/trace1/channel contains only the directory
> metadata
> I verified what happen inside the code and it seems that only the
> "metadata"
> channel exists.
> 
> What may be the cause of the problem?
> 
> Thanks,
> 
> --
> Alessandro

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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com