New Multi-Threaded Pi Program - Faster than SuperPi and PiFast

[Calmatory]

It should be possible to get the CPU info without any assembly. At least by reading /proc/cpuinfo and parsing the data from there. It should include everything you'd be interested in.

I would guess the NTFS support isn't greates on Linux, it used to be very experimental few years ago. I would suggest formatting one of the drives to use ext4 filesystem, it seems to be the fastest all-around filesystem currently, but since there are lots of candidates(xfs, ext2, ext3, reiserfs etc) it could be that there is more suitable filesystem for the work yc does.

Using -O2 and cherrypicking the best optimizations(if any) from that -O3 enables should result in the best outcome. Also trying to disable some -O2 enabled optimizations could help too, though it's most probably not worth the effort.

Have you tried any -march/-mtune (they're actually the same as far as I know) switches?