[Radiance-general] genBSDF multiple processes

[Stephen Wasilewski]

I'm getting some curious (to me) behavior when running genBSDF to calculate
a rank 4 tensor tree (It also happens with '-t3').  When the sampling
resolution is 4 or 5 the program utilizes most of my processing (I notice
it starts 9 rcontrrib processes an 1 rfluxmtx process with '-n 8', so the
threads are each around 80%).  When I change the resolution to 6 (without
changing anything else) the processors top out at 25% and if I increase -n
it still uses no more than ~25% of my total cpu power.  There is plenty of
unused memory.

here is my command:
genBSDF -n 8 -c 10240 -f +b -r '-ab 10 -ad 1 -ss 0 -st .02' -t4 5 -dim 0
2.673 0 2.706 -1.207 0 -geom millimeter test.rad > test.xml

Does anyone know what is going on?
Is there something in the genBSDF program limiting this?
Is it a hardware limitation?
Is it some environmental variable (im running mac OSX 10.9.5)?

Thanks,

Stephen Wasilewski
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