With the Himeno Poisson Pressure Solver, the 32-bit results were once again indifferent while the 64-bit FreeBSD version of Debian was no match for the Linux version.
Next we turned to some disk tests, which started with the Threaded I/O Tester. The 32-bit version of Debian GNU/kFreeBSD with the UFS file-system was 7% faster than Debian GNU/Linux with the default EXT3 file-system. When switching over to 64-bit, however, the Linux distribution was just over 3% faster.
When upping the thread count from 4 to 32 for the writes, the order remained the same with Debian GNU/Linux being the superior 64-bit choice while Debian GNU/kFreeBSD was the better 32-bit competitor.
Debian GNU/kFreeBSD atop UFS just failed in comparison to Debian GNU/Linux and EXT3 that was roughly twice as fast when carrying out 32 threads of random 64MB writes.