General questions about improving computing resources utilization for yade

Hi,

I have 3 questions about improving computing resources utilization for yade:

1.How many computing resource does <Yade script.py> use (such as number of cpu core )?

I reviewed some answers, it seems that <yade -j2 script.py> use 2 threads and <yade -j4 script.py> use 4 threads for the simulation [1], any documents to introduce the details?

Does it mean that <Yade script.py> use only one core (or thread)? Any difference between <Yade script.py> and <yade -j2 script.py>?

2. My CPU info is
CPU info:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2
Core(s) per socket: 4
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 85
Model name: Intel(R) Xeon(R) W-2123 CPU @ 3.60GHz
Stepping: 4
CPU MHz: 2531.440
CPU max MHz: 3900,0000
CPU min MHz: 1200,0000
BogoMIPS: 7200.00
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 1024K
L3 cache: 8448K
NUMA node0 CPU(s): 0-7

I notice that:
Thread(s) per core: 2,
could you please give me suggestion on the choice of <yade -j 4 script.py> or <yade -j 8 script.py>? I am not sure if it is a better idea to set <yade -j 8 script.py>.

3.If I want to run 2 scripts at the same time, I usually open two terminals and run <Yade script1.py> and <Yade script2.py> at the two terminals respectively, is this way recommanded?

Or should I allocate the resource by something like :
<yade -j 4 script1.py> and <yade -j 4 script2.py>, or
<yade -j 2 script1.py> and <yade -j 2 script2.py>?

Thanks,

Leonard

[1]https://answers.launchpad.net/yade/+question/667700