python/pyarrow/tests/test_device.py

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import pyarrow as pa

import pytest


def test_device_memory_manager():
    mm = pa.default_cpu_memory_manager()
    assert mm.is_cpu
    device = mm.device
    assert device.is_cpu
    assert device.device_id == -1
    assert device.device_type == pa.DeviceAllocationType.CPU
    assert device.type_name == "arrow::CPUDevice"
    assert device == device
    assert repr(device) == "<pyarrow.Device: CPUDevice()>"
    assert repr(mm) == "<pyarrow.MemoryManager device: CPUDevice()>"


def test_buffer_device():
    arr = pa.array([0, 1, 2])
    buf = arr.buffers()[1]
    assert buf.device_type == pa.DeviceAllocationType.CPU
    assert isinstance(buf.device, pa.Device)
    assert isinstance(buf.memory_manager, pa.MemoryManager)
    assert buf.is_cpu
    assert buf.device.is_cpu
    assert buf.device == pa.default_cpu_memory_manager().device
    assert buf.memory_manager.is_cpu


def test_copy_to():
    mm = pa.default_cpu_memory_manager()

    arr = pa.array([0, 1, 2])
    batch = pa.record_batch({"col": arr})

    for dest in [mm, mm.device]:
        arr_copied = arr.copy_to(dest)
        assert arr_copied.equals(arr)
        assert arr_copied.buffers()[1].device == mm.device
        assert arr_copied.buffers()[1].address != arr.buffers()[1].address

        batch_copied = batch.copy_to(dest)
        assert batch_copied.equals(batch)
        assert batch_copied["col"].buffers()[1].device == mm.device
        assert batch_copied["col"].buffers()[1].address != arr.buffers()[1].address

    with pytest.raises(TypeError, match="Argument 'destination' has incorrect type"):
        arr.copy_to(mm.device.device_type)

    with pytest.raises(TypeError, match="Argument 'destination' has incorrect type"):
        batch.copy_to(mm.device.device_type)