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https://issues.apache.org/jira/browse/ARROW-4861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16792802#comment-16792802
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Pearu Peterson commented on ARROW-4861:
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No. As discussed in ARROW-2447 , a Device would not be a good representative of
a memory address origin. In certain cases (Managed Memory, Pinned/Host Memory),
the memory address would be accessible from both CPU as well as from device.
A virtual address space should be considered as a notation where only one set
of memory management operations (allocation, deallocation, copy, memset, fill,
etc) can be applied.
MemoryPool would be a better representative (than Device) of a virtual address
space that contains addresses pointing to memories of different devices.
Although at hardware/driver level the addresses will be translated to the
actual addresses of device memories, these translations are transparent to
Arrow processes.
> [C++] Introduce MemoryPool::Memset method.
> ------------------------------------------
>
> Key: ARROW-4861
> URL: https://issues.apache.org/jira/browse/ARROW-4861
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Pearu Peterson
> Assignee: Pearu Peterson
> Priority: Major
> Labels: C++
>
> One can define a device MemoryPool subclass (say, CudaMemoryPool) that can be
> used for creating a Buffer representing a device memory. The prerequisite for
> this to work is that all Buffer memory operations (allocation, deallocation,
> reallocation, etc) can be redefined to use the corresponding device specific
> operations. No host specific operation would be allowed as the device memory
> would be inaccesible from host.
> Currently, this is almost possible. Namely, `Buffer::ZeroPadding` uses host
> specific `memset` function for zero-padding the allocated Buffer memory.
> Suggestion: introduce a new method `MemoryPool::Memset` that
> `Buffer::ZeroPadding` can use.
> The Memset method would use `memset` by default but device specific
> MemoryPool subclasses can override the method to use device driver version of
> the memset function.
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