47 lines
1.2 KiB
Python
47 lines
1.2 KiB
Python
import os
|
|
import multiprocessing as mp
|
|
|
|
import numpy as np
|
|
|
|
from numba import cuda
|
|
from numba.cuda.testing import skip_on_cudasim, CUDATestCase
|
|
import unittest
|
|
|
|
has_mp_get_context = hasattr(mp, 'get_context')
|
|
is_unix = os.name == 'posix'
|
|
|
|
|
|
def fork_test(q):
|
|
from numba.cuda.cudadrv.error import CudaDriverError
|
|
try:
|
|
cuda.to_device(np.arange(1))
|
|
except CudaDriverError as e:
|
|
q.put(e)
|
|
else:
|
|
q.put(None)
|
|
|
|
|
|
@skip_on_cudasim('disabled for cudasim')
|
|
class TestMultiprocessing(CUDATestCase):
|
|
@unittest.skipUnless(has_mp_get_context, 'requires mp.get_context')
|
|
@unittest.skipUnless(is_unix, 'requires Unix')
|
|
def test_fork(self):
|
|
"""
|
|
Test fork detection.
|
|
"""
|
|
cuda.current_context() # force cuda initialize
|
|
# fork in process that also uses CUDA
|
|
ctx = mp.get_context('fork')
|
|
q = ctx.Queue()
|
|
proc = ctx.Process(target=fork_test, args=[q])
|
|
proc.start()
|
|
exc = q.get()
|
|
proc.join()
|
|
# there should be an exception raised in the child process
|
|
self.assertIsNotNone(exc)
|
|
self.assertIn('CUDA initialized before forking', str(exc))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|