cudf: [BUG] Loading `libcudf.so` increases device memory usage by ~300MB

In working with rmm and cudf, if one only uses rmm we observe a lower device memory usage than if we load the libcudf shared library and only use rmm. Apologies for the Python only examples:

Example 1, not loading libcudf.so, device memory usage ~335 MiB:

import rmm

buf = rmm.DeviceBuffer(size=5)
del buf

print("Press enter to exit")
input()

Example 2, loading libcudf.so, device memory usage ~651 MiB:

import rmm
import ctypes

libcudf = ctypes.cdll.LoadLibrary("libcudf.so")

buf = rmm.DeviceBuffer(size=5)
del buf

print("Press enter to exit")
input()

Example 3, construct and destruct buffer then load libcudf.so then construct and destruct buffer again, ~335 MiB in first construct/destruct, ~651 MiB after second construct/destruct:

import rmm
import ctypes

buf = rmm.DeviceBuffer(size=5)
del buf

print("Press enter to continue")
input()

libcudf = ctypes.cdll.LoadLibrary("libcudf.so")

buf = rmm.DeviceBuffer(size=5)
del buf

print("Press enter to exit")
input()