Thanks, I've played around some more and finally more than one capability is active. And indeed, unsafe calls don't block everything. I /had/ actually read that but when I saw the system spending basically only 100% cpu time, I'd thought to ask.
One problem with this program seems to be that the different tasks are of vastly different sizes. Inputs range from ~ 7x10^1 to ~ 3x10^7 elements inducing waits with the larger problem sizes. We'll keep the program single-threaded for now as this also keeps memory consumption at only 25 gbyte instead of the more impressive 70 gbyte in multi-threaded mode ;-) Viele Gruesse, Christian
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