Conclusions

Scalapack:

• needs a lot of hand tuning
• worth the effort (efficient, scalable, portable)

MPI-2:

• lots of useful new possibilities
• still many things missing

We need:

• MPI-2 completely (even if slow at first)
• onesided communication across nodes (even if it remains slow!)
• Scalapack for HP-UX 11 (including 64bit, profiling, ..)