# @Parallel - how to use all CPUs

I am currently working on a parallelised implementation of Pollard-Rho.

For the parallelization of the program I want to use @parallel. But how can I allow Sage to use all the CPUs I have? When I put what they propose in ''doc.sagemath.org/html/en/reference/parallel/sage/parallel/parallelism.html'' :

Using all the cores available on the computer to parallelize tensor computations:

sage: Parallelism().set('tensor')

sage: Parallelism() # random (depends on the computer)

I get back:

Number of processes for parallelization:

- tensor computations: 1

But my computer has more. (Windows tells me: Processor: Intel(R) Core(TM)i5CPU M560 @2.67GHz 2.67 GHz). How do I activate these?