There are multiple ways to perform the computations on CPU and/or GPUs. The main 3 parameters are:

GPU : 0 if matrix multiplication(s) done on CPU, >0 for GPU use. This is the number GPUs to use for matrix mult.
CMmode : 1 if using a combined matrix between WFS pixels and DM actuators, skipping intermediate computation of modes
GPUall : if using GPUall, then the WFS reference subtraction is wrapped inside the GPU matrix multiplication

GPU CMmode GPUall Matrix Features Description

>0 ON ON contrMcact fastest dark-subtracted WFS frame imWFS0 is multiplited by collapsed control matrix (only active pixels). no mcoeff normalization and WFS reference subtraction are wrapped in this GPU operation as subtraction of pre-computed vector output. This is the fastest mode.

>0 ON OFF contrMcact WFS reference is subtracted from imWFS0 in CPU, yielding imWFS2. imWFS2 is multiplied by control matrix (only active pixels) in GPU.

>0 OFF OFF contrM MWFS reference is subtracted from imWFS0 in CPU, yiedling imWFS2. imWFS2 is multiplied (GPU) by control matrix to yield mode values. Mode coefficients then multiplied (GPU) by modes.

0 ON - contrMcact imWFS2 is multiplied by control matrix (only active pixels) in CPU

0 OFF - contrM imWFS2 multiplied by modal control matrix