I have the following snippet of code and would like to know what I am doing wrong below. 

Without parallelizing, if this loop look takes 0.01 seconds. When I use k threads, this function is taking k*0.01 seconds. 

(1) Is there a faster way to evaluate a local expansion at a bunch of points. Or i must assess them 1by1

(2) I tried num threads from k=2 to k=10. This behavior is consistent. always takes (k*0.01). Is this behavior consistent?

{

        values[i] = lexp->PhysEvaluate(glCoords.at(i),el_Phys);

}

// Info  lexp is localExpansionShPtr;

// num_elements ~21

// In the program, I am replacing k with 2 .. 10 number

Ashok.