User of a large IBM SP system encounters hard-wired limit of 128
nodes in RSL.  This mail describes fix (which involves reconfiguring
and recompiling RSL, as well as touching one file in the MM5/MPP code
itself).

                                             - ROTANG

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Mike,

This describes how to raise the limit on the number of nodes above 128.

In the file MPP/RSL/RSL/makefile, change the setting of MAX_PROC from the
current 128 to the number you want.  Don't set this too much larger than
you need it, because it is used to allocated some tables within the RSL
library (and there is an hard upper limit of 2^15-1, or 32767).

After you have changed this, cd to the MPP/RSL/RSL directory and 'make
clean' and 'rm librsl.a' then 'make sp2'.  Then 'cd ../../..' and 'touch
MPP/RSL/parallel_src/lb_alg.c' and then 'make mpp'.  It should not take
very long to recompile and relink.

John

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 John Michalakes,  michalak@ucar.edu,  http://www.mcs.anl.gov/~michalak
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 Argonne National Laboratory | National Center for Atmospheric Research
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