"numthreads" does not have an effect on Knitro/MATLAB

[libao...@gmail.com]

I would like to turn on ‘numthreads>1’ to take advantage of a multi core computer and speed up computation. However, I find it does not have a significant effect on the attached example, where I added “'linsolver_numthreads', 16,'numthreads',16” to options and checked time.

[Richard Waltz]

Hi,

The example model you are solving is a very small toy problem with only 2 variables.  There is overhead using parallelism such that you are unlikely to notice any speedup using a parallel linear solver such as MKL PARIDSO until you are solving problems with at least thousands or tens of thousands of variables.  In addition, on very small problems, there are other things (other than linear algebra) that take a significant percentage of the solve time and that cannot be parallelized.

Regards,

-Richard Waltz

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Sent: Saturday, November 30, 2024 9:38 PM
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Subject: [Knitro] "numthreads" does not have an effect on Knitro/MATLAB

 

I would like to turn on ‘numthreads>1’ to take advantage of a multi core computer and speed up computation. However, I find it does not have a significant effect on the attached example, where I added “'linsolver_numthreads', 16,'numthreads',16” to options and checked time.

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