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

[Alessandro Morari]

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:

> 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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