Parallel Environment (Pe); Migration Considerations; Supported Pe Lpp Levels; Available Pe Migration Paths - IBM RS/6000 SP Handbook

Parallel Environment (PE)

Parallel Environment is comprised of:
1. Parallel Operating Environment (POE)
2. Message Passing Libraries (MPI, MPL)
3. Parallel Utilities which facilitate file manipulations (MPI sample programs)
IBM Parallel Environment for AIX, is not supported in a mixed system partition.
See Table D-8 for AIX and PSSP support levels.
Table D-8 Supported PE LPP levels
PE PSSP 2.4 PSSP 3.1.1
3.1 N N
2.4 N S
2.3 S N
2.2 N N
S = Supported
N = Not supported

Migration considerations

Parallel Environment does not support node by node migration. Migration paths
are shown in Table D-9. There are some migration limitations as follows:
1. All nodes in the system partition need to be migrated to a new level of PE
within the same service window.
2. You can run a particular level of PE with plus or minus one level of AIX or
PSSP so you can migrate to a new level of AIX or PSSP without having to
change to a new level of PE.
3. Applications using threads can migrate from PSSP 2.4 or PSSP 3.1.1 to
PSSP 3.2 through binary compatibility without recompiling but they might not
pick up the D7 libpthreads.a (shr.o) library.
4. You should migrate AIX, then PSSP, then PE.
Table D-9 Available PE migration paths
From
AIX 4.2.1, PSSP 2.4, PE 2.3 + PTF
422 RS/6000 SP and Clustered IBM ^ pSeries Systems Handbook
PSSP 3.2 AIX 4.1.5
S N
N N
N N
N S
To
AIX 4.3.2, PSSP 2.4, PE 2.3 + PTF
AIX 4.2.1 AIX 4.3.3
N S
N S
S S
S N