Creates a list of sub-devices by partitioning a root device based on the provided partition specifier.

A partition specifier must be provided using a partition keyword argument. Possible values for the specifier are: an integer, a string specifying the affinity domain, or a collection of integers.

import dpctl

cpu_d = dpctl.SyclDevice("cpu")
cpu_count = cpu_d.max_compute_units
sub_devs = cpu_d.create_sub_devices(partition=cpu_count // 2)
for d in sub_devs:

# Create sub-devices partitioning by affinity.
    sd = cpu_d.create_sub_devices(partition="numa")
        "{0} sub-devices were created with respective "
        "#EUs being {1}".format(
            len(sd), [d.max_compute_units for d in sd]
except Exception:
    print("Device partitioning by affinity was not successful.")

partition (Union[int, str, List[int]]) –

Specification to partition the device as follows:

  • Specifying an int (count)

    The returned list contains as many sub-devices as can be created such that each sub-device contains count compute units. If the device’s total number of compute units is not evenly divided by count, then the remaining compute units are not included in any of the sub-devices.

  • Specifying an affinity domain as a string

    The supported values are: "numa", "L4_cache", "L3_cache", "L2_cache", "L1_cache", "next_partitionable".

  • Specifying a collection of integral values

    For each non-zero value M in the collection, a sub-device with M compute units is created.


Created sub-devices.

Return type:


  • TypeError – If the partition keyword argument is not specified or the affinity domain string is not legal or is not one of the three supported options.

  • dpctl.SyclSubdeviceCreationError – If sub-devices can not be created.