how to make software/app that runs on 1 processor distribute the load (ie multi thread) on all the processors

The software author would need to code it to take advantage of multiple CPUs. You can also turn off hyperthreading and that would give it a little boost.

Turning off HT wouldn't do a single thing.

Hypertheading splits each core's cycle among multiple processes. If you turn off hypertheading it will only run a single process through the core. So if you're running a program (like the one the author is using) it can be allocated the entire core without having to share it with other processes. It doesn't quite double the performance but it does increase it for single threaded processes.

Unfortunately you're incorrect, hyperthreading will allow a process to split across multiple cores and threads, in the event you disable it, an application which is unaware of hyperthreading it'll make no difference.

The only reason to disable HT would be to reduce the load on the Internal memory controller which would also reduce heat. Essentially disabling it for this would do nothing.

I'm aware of what it is, unfortunately you are providing incorrect information in the fact that you are stating that disabling HT would make a difference for this. Which is won't. Also, you can run multiple processes at the same time on cores, if the application is aware of HT it would make use of the HT and multiple cores, if it's not, it'll just cane the one core which is what this application will do.

OK, well I still maintain that disabling hyperthreading will probably give some additional performance to the application. I guess the author will need to come to their own conclusion.

Thanks guys : I happen to recall that when disabiling hyperthreading, the # of processors shown
in Task Manager will halve.  Guess will just have to test it out & that will determine the outcome.

Lee,
I'm using Krylack recovery tool (free version):  I noticed that if I "hibernate" the computer, it'll
resume from where it last 'pause' & not lose the work but if I shutdown or restart this tool,
it will start all over again, ie lose the work done so far.

Just noticed I could run several instance of this tool & it will give a separate attached screen:
& I can specify to start brute-forcing from which number (we always use length of 8 & above):
then I can use Task Manager to assign each of the process to specific processor ie CPU affinity.

Just 1 help I need: to determine for a password length of 8, this tool start cracking from
"11111111" or "aaaaaaaa" or "~~~~~~~~" or ??  so that I can specify what password to start
from.

Lastly I've tried 2 online ones & they failed the next day: so
zipwdrecovKr.jpg

... so before I pay for one, I wanted to ensure it will work.

7password.com  just hangs  while another paid service (after they succeeded) failed the next day.

I noticed on my x230 (Win 7 64bit), it gives about 5000-6000 passwd/sec while on my x270 (Win 10, guess it's 64bit), it's only 330-380 passwd/sec

correction: should read
while another paid service (they charge after they succeeded) ...

Any suggestion on any other tools/service that "pay only if succeed in the recovery" are most welcome.

I guess those online ones (which charges after they succeed) use cloud/GPU/multi-processor but I don't have visibility of this & their chances of success

After about 5 mins on the x270, the CPU utilization for each drops to about 8-12% & 
number of passwd/sec drop to 250-300/sec

Ok, appreciate the frank answer: is there any cloud service out there that could possibly
offer such a "supercomputer" cracking service that anyone know?  

I can't get that amount of computing resource even if I use the paid software that Alex
suggests, so I'm counting on any cloud supercomputing service out there, if there's any