parfor images and gpu

i use the new options in loops

parfor
some code,,,
someimage=gpuarray(image)
process(someimage)
end

1) it slows down pc 2) it takes all memory 3) somtimes it works slower than normal loop and image in cpu

so when it is usful to use parfor (images i suppose transmited all fors if it is array) and gpu not alwayes fast is it the communication gpu cpu that takes the time?

Answer 1

[Joss Knight]

You've only got one GPU so it's rarely faster to run anything on it in a parallel pool. Doing so is just an elaborate way of running the computation serially but with greater overhead and less memory.

Get a second GPU, and you'll see an improvement.