Performance:
- writing a large distributed array (500MB)
- distributed I/O with MPI2 versus I/O via master task:
- send&write faster (even across nodes)
- MPI-I/O depends less on block sizes
- 100 MB/s maximal write over fibre channel
- user I/O disk I/O (HP-UX buffer cache, FC60 cache memory)
MPI-I/O across hosts:
- Each host holds a file of the complete size
- contains valid data for the local tasks
- contains 0's for the remote tasks
Peter Junglas 6.3.2000