Comments (2)
Update: the forward-scattering streak may be a result of incorrect floating-point epsilon setting.
The IEEE 754 epsilon for float32 is around 1.1e-7. Setting it to 1e-10 will likely drive the code into the wrong if-block as shown here
https://github.com/fangq/mcx/blob/master/src/mcx_core.cu#L394
the small epsilon issue was recently corrected in
http://sourceforge.net/p/mcx/svn/341/
hope this patch will also make the forward-scattering streak go away, but because it has not been consistently reproducible, rigorous test has not been done yet.
nonetheless, exploring other RNGs options are still needed.
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Two new RNGs are now implemented in MCX, including POSIX erand48 and xorshift128+.
while we are continue investigating the quality of LL5 RNG, the priority of this task is reduced.
close this for now.
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