'import ccall unsafe' and parallelism

[Christian Höner zu Siederdissen]

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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