Wolfgang,

> One thing that surprises me is that the FETools::compute_embedding_matrices 
> function uses tasks (handled by the TBB) whereas the tests you cite use 
> threads (handled by Boost). I don't know where the connection is.

You're of course right, these are two different things. We got confused
because the mutex underlying TaskGroup<>::join_all is handled by boost
(or by the c++0x library directly), which popped up in gdb.

> So in essence I'm afraid I'm not of much help. Try if the TBB upgrade helped 
> some, otherwise I'll put the Boost upgrade at the top of my list.

We already made today's tests with the new TBB, but that unfortunately
didn't do the trick. We'll come back if we discover anything new...

Best,
Katharina and Martin

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