How to set the multithreading of the blas (matlab2019) in my new I9-10900X

The 'a\b' operator works well on my old PC (i7/4core/matlab2017a). It can use all 4 CPU. But on my new PC(I9 10900XE), it can only use 1 core, whatever in Matlab2015b,2017a or 2019b.

OS：win10 ent

env：

NUMBER_OF_PROCESSORS=20

PROCESSOR_ARCHITECTURE=AMD64

PROCESSOR_REVISION=5507

version -blas ： Intel(R) Math Kernel Library Version 2018.0.3 Product Build 20180406 for Intel(R) 64 architecture applications, CNR branch AVX512

maxNumCompThreads : 10

I also try to install intel PS2013 and then PS2018, but it seems useless.

Answer 1

[guoliang song]

Oh, matlab is really a marvel!

If I work on the command line and input the three lines bellow, then matlab can use all 10 cores.

load('teaa466.mat','aa');

load('tebb466.mat','bb');

ab=aa\bb(:,5);

But if I wrote these three lines into a function f_fit4()

Then I run this function f_fit4. Matlab can only use 1 core.

That is not the end:

If I run these four lines in command window:

load('teaa466.mat','aa');

load('tebb466.mat','bb');

ab=aa\bb(:,5);

f_fit4;

Both two process can use all 10 core!!!!!!!!!!