how to set mkl's system variables in program?

[Zhanghong_T_]

Hello all,

I am trying to use MKL's libraries which support 'openmp' technology. Now I can let the program make use of all cpus if I set the 'mkl_serial=no' from 'my computer->properities->advanced->environment variables->system variables->new->...'.

However, I wish this system variables can be changed/controlled by my program, so I use the following code:

err=system('set MKL_SERIAL=NO')

I found the return value err=0, but after the program runs, the actual cpu usage is not appears as what I expected, but act as what the variables set as the first method.

So, could any one tell me how should I do to achive what I expected?

Thanks,

Zhanghong Tang

[TimP]

You would need to set OMP_NUM_THREADS, if you haven't done so.

[Zhanghong_T_]

Hi Tim,

Thank you very much for your help! Do you mean I should set it in the code? Could you tell me how to set it?

I have set the envrionment variable NUMBER_OF_PROCESSORS, should I set another envrionment variable OMP_NUM_THREADS?

Thanks,

Zhanghong Tang

[TimP]

Certain versions of MKL did use NUMBER_OF_PROCESSORS, on Windows, in the absence of OMP_NUM_THREADS.

[Zhanghong_T_]

Hi all,

It seems that PARDISO also calls MKL's math library, it's parallel compution don't need to set mak's system variables, how could it realize this, or does it just call MKL's library in serial mode and then parallel in its code?

Thanks,

Zhanghong Tang