I scan my cpu with xoreaxeaxeax's sandsifter but as you showed it stopped early. so I tried to scan with this project, but the sifter.py script can not exit and the log file can just save about 20 lines. The sifter.py script stopped like this picture:

the data saved in log file as:
log.txt
My cpu is Intel Xeon E3-1225V2 and with Ubuntu16.04, linux kernel is 4.4.0-137-generic.
I wonder if there is something wrong with the sifter.py script or there is a bug instruction?