Updated with additional 32-bit case 1 w/o photons runs. Note improvement for
single thread vs. 3.6.2:
time in seconds -- elapsed time (total CPU)
trace Case 1 Case 2
threads CPU(approx.) photons no photons no photons
3.6.2 64bit 13% 99 31 158
3.6.2 32bit, 13% 209 71 160
SSE2
3.7 b36 64bit 1 13% 119(119) 36(36) 154(154)
4 51% 48(159) 13(51) 53(208)
8 100% 37(214) 9(66) 35(270)
3.7 b36 32bit 1 37(37)
SSE2 4 13(52)
8 100% 39(228) 10(70) 41(310)
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