[Radiance-general] rtcontrib -n

[Wendelin.Sprenger at ise.fraunhofer.de]

Hello everybody,

working with rtcontrib, I have problems to use more than one core. While 
the main rtcontrib process
works at 100% CPU load, the rtrace processes only work at 5% CPU load.
The reason may be connected with the -x option of rtrace that I don't 
understand. This is the rtrace process automatically generated by 
rtcontrib:

rtrace -dj .9 -dr 3 -ab 1 -ad 350 -ab 3 -ad 1024 -lw .0003 -ld- -ti 
sky_glow -w -h- -x 1 -y 0 -dt 0 -as 0 -aa 0 -o~~TmWdp -PP pfg5s274 -fff 
ground.oct
As can be seen, the -x option is set 1 while the -y option is set 0.

Reading the man page of rtrace concerning the -n option, it reads:
"There is no benefit from specifying more processes than there are cores 
available on the system or the -x setting, which forces a wait at each 
flush."

However, I don't understand what that means or what the -x and -y options 
of rtrace do exactly.
How can I reach 100% CPU load also for the rtrace subprocesses?

Thanks for your help.
Wendelin Sprenger

___________________________________
Mag.rer.nat. Wendelin Sprenger
Division Thermal Systems and Buildings
Fraunhofer Institute for Solar Energy Systems ISE
Heidenhofstr. 2, 79110 Freiburg, Germany
Phone: +49 (0) 7 61/ 45 88-57 45
wendelin.sprenger at ise.fraunhofer.de
http://www.ise.fraunhofer.de
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