dpctl.memory.MemoryUSMHost

class dpctl.memory.MemoryUSMHost(nbytes, alignment=0, queue=None, copy=False)

An object representing allocation of SYCL USM-host memory.

Non-positive alignment values are not ignored and the allocator malloc_host is used for allocation instead. If queue is None a cached default-constructed dpctl.SyclQueue is used to allocate memory.

Attributes:

`nbytes`	Extent of this USM buffer in bytes.
`reference_obj`	Reference to the Python object owning this USM buffer.
`size`	Extent of this USM buffer in bytes.
`sycl_context`	`dpctl.SyclContext` the USM pointer is bound to.
`sycl_device`	`dpctl.SyclDevice` the USM pointer is bound to.
`sycl_queue`	`dpctl.SyclQueue` with `dpctl.SyclContext` the USM allocation is bound to and `dpctl.SyclDevice` it was allocated on.

Public methods:

`copy_from_device`(sycl_usm_ary)	Copy SYCL memory underlying the argument object into the memory of the instance
`copy_from_host`(obj)	Copy content of Python buffer provided by obj to instance memory.
`copy_to_host`([obj])	Copy content of instance's memory into memory of `obj`, or allocate NumPy array of `obj` is `None`.
`get_usm_type`([syclobj])	Returns the type of USM allocation using Sycl context carried by syclobj keyword argument.
`get_usm_type_enum`([syclobj])	get_usm_type(syclobj=None)
`memset`([val])	Populates this USM allocation with given value.
`tobytes`()	Constructs bytes object populated with copy of USM memory.

Attributes

MemoryUSMHost._context: dpctl.SyclContext the USM pointer is bound to.

MemoryUSMHost._pointer: USM pointer at the start of this buffer represented in Python integer.

MemoryUSMHost._queue: dpctl.SyclQueue with dpctl.SyclContext the USM allocation is bound to and dpctl.SyclDevice it was allocated on.

MemoryUSMHost.nbytes: Extent of this USM buffer in bytes.

MemoryUSMHost.reference_obj: Reference to the Python object owning this USM buffer.

MemoryUSMHost.size: Extent of this USM buffer in bytes.

MemoryUSMHost.sycl_context: dpctl.SyclContext the USM pointer is bound to.

MemoryUSMHost.sycl_device: dpctl.SyclDevice the USM pointer is bound to.

MemoryUSMHost.sycl_queue: dpctl.SyclQueue with dpctl.SyclContext the USM allocation is bound to and dpctl.SyclDevice it was allocated on.

Public methods

dpctl.memory.MemoryUSMHost.copy_from_device(self, sycl_usm_ary): Copy SYCL memory underlying the argument object into the memory of the instance

dpctl.memory.MemoryUSMHost.copy_from_host(self, obj): Copy content of Python buffer provided by obj to instance memory.

dpctl.memory.MemoryUSMHost.copy_to_host(self, obj=None): Copy content of instance’s memory into memory of obj, or allocate NumPy array of obj is None.

dpctl.memory.MemoryUSMHost.get_usm_type(syclobj=None): Returns the type of USM allocation using Sycl context carried by syclobj keyword argument. Value of None is understood to query against self.sycl_context - the context used to create the allocation.

dpctl.memory.MemoryUSMHost.get_usm_type_enum(self, syclobj=None)

get_usm_type(syclobj=None)

Returns the type of USM allocation using Sycl context carried by syclobj keyword argument. Value of None is understood to query against self.sycl_context - the context used to create the allocation.

dpctl.memory.MemoryUSMHost.memset(self, val=0): Populates this USM allocation with given value.

dpctl.memory.MemoryUSMHost.tobytes(self): Constructs bytes object populated with copy of USM memory.