The MPI version of RAxML is now installed on the AIX power7 cluster.  This is alpha code - check your results carefully!  The manual is here and here is an example loadleveler script to run RAxML:

#!/bin/sh
# @ output = $(Executable).$(Cluster).out 
# @ error = $(Executable).$(Cluster).err 
# @ notification = never
# @ job_type = parallel
# @ class = p7aix_dev
# @ group = UC
# @ blocking = unlimited
# @ wall_clock_limit = 0:30:00
# @ total_tasks = 8
# @ rset = rset_mcm_affinity
# @ mcm_affinity_options = mcm_accumulate,mcm_mem_pref
# @ queue 
/usr/local/pkg/raxml/version/bin/raxmlHPC-MPI -m GTRGAMMA -n result -x 12345 -p 12345 -s raxml_inputphy.txt -N 8
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