Issue #12655: Instead of requiring a custom type, os.sched_getaffinity and
os.sched_setaffinity now use regular sets of integers to represent the CPUs a process is restricted to.
This commit is contained in:
Antoine Pitrou
parent
a0e3febe5a
commit
848698727f
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@ -3141,47 +3141,17 @@ operating system.
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Voluntarily relinquish the CPU.
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.. class:: cpu_set(ncpus)
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:class:`cpu_set` represents a set of CPUs on which a process is eligible to
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run. *ncpus* is the number of CPUs the set should describe. Methods on
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:class:`cpu_set` allow CPUs to be add or removed.
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:class:`cpu_set` supports the AND, OR, and XOR bitwise operations. For
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example, given two cpu_sets, ``one`` and ``two``, ``one | two`` returns a
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:class:`cpu_set` containing the cpus enabled both in ``one`` and ``two``.
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.. method:: set(i)
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Enable CPU *i*.
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.. method:: clear(i)
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Remove CPU *i*.
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.. method:: isset(i)
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Return ``True`` if CPU *i* is enabled in the set.
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.. method:: count()
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Return the number of enabled CPUs in the set.
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.. method:: zero()
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Clear the set completely.
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.. function:: sched_setaffinity(pid, mask)
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Restrict the process with PID *pid* to a set of CPUs. *mask* is a
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:class:`cpu_set` instance.
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Restrict the process with PID *pid* (or the current process if zero) to a
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set of CPUs. *mask* is an iterable of integers representing the set of
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CPUs to which the process should be restricted.
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.. function:: sched_getaffinity(pid, size)
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.. function:: sched_getaffinity(pid)
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Return the :class:`cpu_set` the process with PID *pid* is restricted to. The
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result will contain *size* CPUs.
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Return the set of CPUs the process with PID *pid* (or the current process
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if zero) is restricted to.
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.. _os-path:
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@ -855,7 +855,7 @@ class PosixTester(unittest.TestCase):
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requires_sched_h = unittest.skipUnless(hasattr(posix, 'sched_yield'),
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"don't have scheduling support")
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requires_sched_affinity = unittest.skipUnless(hasattr(posix, 'cpu_set'),
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requires_sched_affinity = unittest.skipUnless(hasattr(posix, 'sched_setaffinity'),
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"don't have sched affinity support")
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@requires_sched_h
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@ -936,84 +936,29 @@ class PosixTester(unittest.TestCase):
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self.assertLess(interval, 1.)
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@requires_sched_affinity
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def test_sched_affinity(self):
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mask = posix.sched_getaffinity(0, 1024)
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self.assertGreaterEqual(mask.count(), 1)
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self.assertIsInstance(mask, posix.cpu_set)
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self.assertRaises(OSError, posix.sched_getaffinity, -1, 1024)
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empty = posix.cpu_set(10)
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def test_sched_getaffinity(self):
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mask = posix.sched_getaffinity(0)
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self.assertIsInstance(mask, set)
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self.assertGreaterEqual(len(mask), 1)
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self.assertRaises(OSError, posix.sched_getaffinity, -1)
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for cpu in mask:
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self.assertIsInstance(cpu, int)
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self.assertGreaterEqual(cpu, 0)
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self.assertLess(cpu, 1 << 32)
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@requires_sched_affinity
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def test_sched_setaffinity(self):
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mask = posix.sched_getaffinity(0)
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if len(mask) > 1:
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# Empty masks are forbidden
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mask.pop()
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posix.sched_setaffinity(0, mask)
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self.assertRaises(OSError, posix.sched_setaffinity, 0, empty)
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self.assertEqual(posix.sched_getaffinity(0), mask)
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self.assertRaises(OSError, posix.sched_setaffinity, 0, [])
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self.assertRaises(ValueError, posix.sched_setaffinity, 0, [-10])
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self.assertRaises(OverflowError, posix.sched_setaffinity, 0, [1<<128])
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self.assertRaises(OSError, posix.sched_setaffinity, -1, mask)
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@requires_sched_affinity
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def test_cpu_set_basic(self):
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s = posix.cpu_set(10)
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self.assertEqual(len(s), 10)
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self.assertEqual(s.count(), 0)
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s.set(0)
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s.set(9)
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self.assertTrue(s.isset(0))
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self.assertTrue(s.isset(9))
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self.assertFalse(s.isset(5))
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self.assertEqual(s.count(), 2)
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s.clear(0)
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self.assertFalse(s.isset(0))
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self.assertEqual(s.count(), 1)
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s.zero()
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self.assertFalse(s.isset(0))
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self.assertFalse(s.isset(9))
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self.assertEqual(s.count(), 0)
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self.assertRaises(ValueError, s.set, -1)
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self.assertRaises(ValueError, s.set, 10)
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self.assertRaises(ValueError, s.clear, -1)
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self.assertRaises(ValueError, s.clear, 10)
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self.assertRaises(ValueError, s.isset, -1)
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self.assertRaises(ValueError, s.isset, 10)
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@requires_sched_affinity
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def test_cpu_set_cmp(self):
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self.assertNotEqual(posix.cpu_set(11), posix.cpu_set(12))
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l = posix.cpu_set(10)
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r = posix.cpu_set(10)
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self.assertEqual(l, r)
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l.set(1)
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self.assertNotEqual(l, r)
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r.set(1)
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self.assertEqual(l, r)
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@requires_sched_affinity
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def test_cpu_set_bitwise(self):
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l = posix.cpu_set(5)
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l.set(0)
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l.set(1)
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r = posix.cpu_set(5)
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r.set(1)
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r.set(2)
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b = l & r
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self.assertEqual(b.count(), 1)
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self.assertTrue(b.isset(1))
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b = l | r
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self.assertEqual(b.count(), 3)
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self.assertTrue(b.isset(0))
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self.assertTrue(b.isset(1))
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self.assertTrue(b.isset(2))
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b = l ^ r
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self.assertEqual(b.count(), 2)
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self.assertTrue(b.isset(0))
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self.assertFalse(b.isset(1))
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self.assertTrue(b.isset(2))
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b = l
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b |= r
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self.assertIs(b, l)
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self.assertEqual(l.count(), 3)
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@requires_sched_affinity
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@support.cpython_only
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def test_cpu_set_sizeof(self):
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self.assertGreater(sys.getsizeof(posix.cpu_set(1000)),
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sys.getsizeof(posix.cpu_set(1)))
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def test_rtld_constants(self):
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# check presence of major RTLD_* constants
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posix.RTLD_LAZY
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@ -77,6 +77,10 @@ Core and Builtins
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Library
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-------
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- Issue #12655: Instead of requiring a custom type, os.sched_getaffinity and
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os.sched_setaffinity now use regular sets of integers to represent the CPUs
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a process is restricted to.
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- Issue #15538: Fix compilation of the getnameinfo() / getaddrinfo()
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emulation code. Patch by Philipp Hagemeister.
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@ -5720,305 +5720,8 @@ posix_sched_yield(PyObject *self, PyObject *noargs)
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#ifdef HAVE_SCHED_SETAFFINITY
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typedef struct {
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PyObject_HEAD;
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Py_ssize_t size;
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int ncpus;
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cpu_set_t *set;
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} Py_cpu_set;
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static PyTypeObject cpu_set_type;
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static void
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cpu_set_dealloc(Py_cpu_set *set)
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{
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assert(set->set);
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CPU_FREE(set->set);
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Py_TYPE(set)->tp_free(set);
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}
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static Py_cpu_set *
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make_new_cpu_set(PyTypeObject *type, Py_ssize_t size)
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{
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Py_cpu_set *set;
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if (size < 0) {
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PyErr_SetString(PyExc_ValueError, "negative size");
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return NULL;
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}
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set = (Py_cpu_set *)type->tp_alloc(type, 0);
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if (!set)
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return NULL;
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set->ncpus = size;
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set->size = CPU_ALLOC_SIZE(size);
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set->set = CPU_ALLOC(size);
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if (!set->set) {
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type->tp_free(set);
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PyErr_NoMemory();
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return NULL;
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}
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CPU_ZERO_S(set->size, set->set);
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return set;
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}
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static PyObject *
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cpu_set_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
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{
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int size;
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if (!_PyArg_NoKeywords("cpu_set()", kwargs) ||
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!PyArg_ParseTuple(args, "i:cpu_set", &size))
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return NULL;
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return (PyObject *)make_new_cpu_set(type, size);
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}
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PyDoc_STRVAR(cpu_set_sizeof_doc,
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"cpu_set.__sizeof__() -> int\n\n\
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Returns size in memory, in bytes.");
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static PyObject *
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cpu_set_sizeof(Py_cpu_set *set, PyObject *noargs)
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{
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Py_ssize_t res = 0;
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res = sizeof(Py_cpu_set);
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res += set->size;
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return PyLong_FromSsize_t(res);
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}
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static PyObject *
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cpu_set_repr(Py_cpu_set *set)
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{
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return PyUnicode_FromFormat("<cpu_set with %li entries>", set->ncpus);
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}
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static Py_ssize_t
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cpu_set_len(Py_cpu_set *set)
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{
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return set->ncpus;
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}
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static int
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_get_cpu(Py_cpu_set *set, const char *requester, PyObject *args)
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{
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int cpu;
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if (!PyArg_ParseTuple(args, requester, &cpu))
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return -1;
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if (cpu < 0) {
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PyErr_SetString(PyExc_ValueError, "cpu < 0 not valid");
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return -1;
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}
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if (cpu >= set->ncpus) {
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PyErr_SetString(PyExc_ValueError, "cpu too large for set");
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return -1;
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}
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return cpu;
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}
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PyDoc_STRVAR(cpu_set_set_doc,
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"cpu_set.set(i)\n\n\
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Add CPU *i* to the set.");
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static PyObject *
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cpu_set_set(Py_cpu_set *set, PyObject *args)
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{
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int cpu = _get_cpu(set, "i|set", args);
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if (cpu == -1)
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return NULL;
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CPU_SET_S(cpu, set->size, set->set);
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Py_RETURN_NONE;
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}
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PyDoc_STRVAR(cpu_set_count_doc,
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"cpu_set.count() -> int\n\n\
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Return the number of CPUs active in the set.");
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static PyObject *
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cpu_set_count(Py_cpu_set *set, PyObject *noargs)
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{
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return PyLong_FromLong(CPU_COUNT_S(set->size, set->set));
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}
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PyDoc_STRVAR(cpu_set_clear_doc,
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"cpu_set.clear(i)\n\n\
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Remove CPU *i* from the set.");
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static PyObject *
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cpu_set_clear(Py_cpu_set *set, PyObject *args)
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{
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int cpu = _get_cpu(set, "i|clear", args);
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if (cpu == -1)
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return NULL;
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CPU_CLR_S(cpu, set->size, set->set);
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Py_RETURN_NONE;
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}
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PyDoc_STRVAR(cpu_set_isset_doc,
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"cpu_set.isset(i) -> bool\n\n\
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Test if CPU *i* is in the set.");
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static PyObject *
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cpu_set_isset(Py_cpu_set *set, PyObject *args)
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{
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int cpu = _get_cpu(set, "i|isset", args);
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if (cpu == -1)
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return NULL;
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if (CPU_ISSET_S(cpu, set->size, set->set))
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Py_RETURN_TRUE;
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Py_RETURN_FALSE;
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}
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PyDoc_STRVAR(cpu_set_zero_doc,
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"cpu_set.zero()\n\n\
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Clear the cpu_set.");
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static PyObject *
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cpu_set_zero(Py_cpu_set *set, PyObject *noargs)
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{
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CPU_ZERO_S(set->size, set->set);
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Py_RETURN_NONE;
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}
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static PyObject *
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cpu_set_richcompare(Py_cpu_set *set, Py_cpu_set *other, int op)
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{
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int eq;
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if ((op != Py_EQ && op != Py_NE) || Py_TYPE(other) != &cpu_set_type)
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Py_RETURN_NOTIMPLEMENTED;
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eq = set->ncpus == other->ncpus && CPU_EQUAL_S(set->size, set->set, other->set);
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if ((op == Py_EQ) ? eq : !eq)
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Py_RETURN_TRUE;
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else
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Py_RETURN_FALSE;
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}
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#define CPU_SET_BINOP(name, op) \
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static PyObject * \
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do_cpu_set_##name(Py_cpu_set *left, Py_cpu_set *right, Py_cpu_set *res) { \
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if (res) { \
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Py_INCREF(res); \
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} \
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else { \
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res = make_new_cpu_set(&cpu_set_type, left->ncpus); \
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if (!res) \
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return NULL; \
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} \
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if (Py_TYPE(right) != &cpu_set_type || left->ncpus != right->ncpus) { \
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Py_DECREF(res); \
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Py_RETURN_NOTIMPLEMENTED; \
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} \
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assert(left->size == right->size && right->size == res->size); \
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op(res->size, res->set, left->set, right->set); \
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return (PyObject *)res; \
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} \
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static PyObject * \
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cpu_set_##name(Py_cpu_set *left, Py_cpu_set *right) { \
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return do_cpu_set_##name(left, right, NULL); \
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} \
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static PyObject * \
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cpu_set_i##name(Py_cpu_set *left, Py_cpu_set *right) { \
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return do_cpu_set_##name(left, right, left); \
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} \
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CPU_SET_BINOP(and, CPU_AND_S)
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CPU_SET_BINOP(or, CPU_OR_S)
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CPU_SET_BINOP(xor, CPU_XOR_S)
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#undef CPU_SET_BINOP
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PyDoc_STRVAR(cpu_set_doc,
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"cpu_set(size)\n\n\
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Create an empty mask of CPUs.");
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static PyNumberMethods cpu_set_as_number = {
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0, /*nb_add*/
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0, /*nb_subtract*/
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0, /*nb_multiply*/
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0, /*nb_remainder*/
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0, /*nb_divmod*/
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0, /*nb_power*/
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0, /*nb_negative*/
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0, /*nb_positive*/
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0, /*nb_absolute*/
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0, /*nb_bool*/
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0, /*nb_invert*/
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0, /*nb_lshift*/
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0, /*nb_rshift*/
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(binaryfunc)cpu_set_and, /*nb_and*/
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(binaryfunc)cpu_set_xor, /*nb_xor*/
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(binaryfunc)cpu_set_or, /*nb_or*/
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0, /*nb_int*/
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0, /*nb_reserved*/
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0, /*nb_float*/
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0, /*nb_inplace_add*/
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0, /*nb_inplace_subtract*/
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0, /*nb_inplace_multiply*/
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0, /*nb_inplace_remainder*/
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0, /*nb_inplace_power*/
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0, /*nb_inplace_lshift*/
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0, /*nb_inplace_rshift*/
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(binaryfunc)cpu_set_iand, /*nb_inplace_and*/
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(binaryfunc)cpu_set_ixor, /*nb_inplace_xor*/
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(binaryfunc)cpu_set_ior, /*nb_inplace_or*/
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};
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static PySequenceMethods cpu_set_as_sequence = {
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(lenfunc)cpu_set_len, /* sq_length */
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};
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static PyMethodDef cpu_set_methods[] = {
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{"clear", (PyCFunction)cpu_set_clear, METH_VARARGS, cpu_set_clear_doc},
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{"count", (PyCFunction)cpu_set_count, METH_NOARGS, cpu_set_count_doc},
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{"isset", (PyCFunction)cpu_set_isset, METH_VARARGS, cpu_set_isset_doc},
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{"set", (PyCFunction)cpu_set_set, METH_VARARGS, cpu_set_set_doc},
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{"zero", (PyCFunction)cpu_set_zero, METH_NOARGS, cpu_set_zero_doc},
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{"__sizeof__", (PyCFunction)cpu_set_sizeof, METH_NOARGS, cpu_set_sizeof_doc},
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{NULL, NULL} /* sentinel */
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};
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static PyTypeObject cpu_set_type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"posix.cpu_set", /* tp_name */
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sizeof(Py_cpu_set), /* tp_basicsize */
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0, /* tp_itemsize */
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/* methods */
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(destructor)cpu_set_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_reserved */
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(reprfunc)cpu_set_repr, /* tp_repr */
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&cpu_set_as_number, /* tp_as_number */
|
||||
&cpu_set_as_sequence, /* tp_as_sequence */
|
||||
0, /* tp_as_mapping */
|
||||
PyObject_HashNotImplemented, /* tp_hash */
|
||||
0, /* tp_call */
|
||||
0, /* tp_str */
|
||||
PyObject_GenericGetAttr, /* tp_getattro */
|
||||
0, /* tp_setattro */
|
||||
0, /* tp_as_buffer */
|
||||
Py_TPFLAGS_DEFAULT, /* tp_flags */
|
||||
cpu_set_doc, /* tp_doc */
|
||||
0, /* tp_traverse */
|
||||
0, /* tp_clear */
|
||||
(richcmpfunc)cpu_set_richcompare, /* tp_richcompare */
|
||||
0, /* tp_weaklistoffset */
|
||||
0, /* tp_iter */
|
||||
0, /* tp_iternext */
|
||||
cpu_set_methods, /* tp_methods */
|
||||
0, /* tp_members */
|
||||
0, /* tp_getset */
|
||||
0, /* tp_base */
|
||||
0, /* tp_dict */
|
||||
0, /* tp_descr_get */
|
||||
0, /* tp_descr_set */
|
||||
0, /* tp_dictoffset */
|
||||
0, /* tp_init */
|
||||
PyType_GenericAlloc, /* tp_alloc */
|
||||
cpu_set_new, /* tp_new */
|
||||
PyObject_Del, /* tp_free */
|
||||
};
|
||||
/* The minimum number of CPUs allocated in a cpu_set_t */
|
||||
static const int NCPUS_START = sizeof(unsigned long) * CHAR_BIT;
|
||||
|
||||
PyDoc_STRVAR(posix_sched_setaffinity__doc__,
|
||||
"sched_setaffinity(pid, cpu_set)\n\n\
|
||||
|
|
@ -6028,14 +5731,89 @@ static PyObject *
|
|||
posix_sched_setaffinity(PyObject *self, PyObject *args)
|
||||
{
|
||||
pid_t pid;
|
||||
Py_cpu_set *cpu_set;
|
||||
int ncpus;
|
||||
size_t setsize;
|
||||
cpu_set_t *mask = NULL;
|
||||
PyObject *iterable, *iterator = NULL, *item;
|
||||
|
||||
if (!PyArg_ParseTuple(args, _Py_PARSE_PID "O!:sched_setaffinity",
|
||||
&pid, &cpu_set_type, &cpu_set))
|
||||
if (!PyArg_ParseTuple(args, _Py_PARSE_PID "O:sched_setaffinity",
|
||||
&pid, &iterable))
|
||||
return NULL;
|
||||
if (sched_setaffinity(pid, cpu_set->size, cpu_set->set))
|
||||
return posix_error();
|
||||
|
||||
iterator = PyObject_GetIter(iterable);
|
||||
if (iterator == NULL)
|
||||
return NULL;
|
||||
|
||||
ncpus = NCPUS_START;
|
||||
setsize = CPU_ALLOC_SIZE(ncpus);
|
||||
mask = CPU_ALLOC(ncpus);
|
||||
if (mask == NULL) {
|
||||
PyErr_NoMemory();
|
||||
goto error;
|
||||
}
|
||||
CPU_ZERO_S(setsize, mask);
|
||||
|
||||
while ((item = PyIter_Next(iterator))) {
|
||||
long cpu;
|
||||
if (!PyLong_Check(item)) {
|
||||
PyErr_Format(PyExc_TypeError,
|
||||
"expected an iterator of ints, "
|
||||
"but iterator yielded %R",
|
||||
Py_TYPE(item));
|
||||
Py_DECREF(item);
|
||||
goto error;
|
||||
}
|
||||
cpu = PyLong_AsLong(item);
|
||||
Py_DECREF(item);
|
||||
if (cpu < 0) {
|
||||
if (!PyErr_Occurred())
|
||||
PyErr_SetString(PyExc_ValueError, "negative CPU number");
|
||||
goto error;
|
||||
}
|
||||
if (cpu > INT_MAX - 1) {
|
||||
PyErr_SetString(PyExc_OverflowError, "CPU number too large");
|
||||
goto error;
|
||||
}
|
||||
if (cpu >= ncpus) {
|
||||
/* Grow CPU mask to fit the CPU number */
|
||||
int newncpus = ncpus;
|
||||
cpu_set_t *newmask;
|
||||
size_t newsetsize;
|
||||
while (newncpus <= cpu) {
|
||||
if (newncpus > INT_MAX / 2)
|
||||
newncpus = cpu + 1;
|
||||
else
|
||||
newncpus = newncpus * 2;
|
||||
}
|
||||
newmask = CPU_ALLOC(newncpus);
|
||||
if (newmask == NULL) {
|
||||
PyErr_NoMemory();
|
||||
goto error;
|
||||
}
|
||||
newsetsize = CPU_ALLOC_SIZE(newncpus);
|
||||
CPU_ZERO_S(newsetsize, newmask);
|
||||
memcpy(newmask, mask, setsize);
|
||||
CPU_FREE(mask);
|
||||
setsize = newsetsize;
|
||||
mask = newmask;
|
||||
ncpus = newncpus;
|
||||
}
|
||||
CPU_SET_S(cpu, setsize, mask);
|
||||
}
|
||||
Py_CLEAR(iterator);
|
||||
|
||||
if (sched_setaffinity(pid, setsize, mask)) {
|
||||
posix_error();
|
||||
goto error;
|
||||
}
|
||||
CPU_FREE(mask);
|
||||
Py_RETURN_NONE;
|
||||
|
||||
error:
|
||||
if (mask)
|
||||
CPU_FREE(mask);
|
||||
Py_XDECREF(iterator);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
PyDoc_STRVAR(posix_sched_getaffinity__doc__,
|
||||
|
|
@ -6047,20 +5825,58 @@ static PyObject *
|
|||
posix_sched_getaffinity(PyObject *self, PyObject *args)
|
||||
{
|
||||
pid_t pid;
|
||||
int ncpus;
|
||||
Py_cpu_set *res;
|
||||
int cpu, ncpus, count;
|
||||
size_t setsize;
|
||||
cpu_set_t *mask = NULL;
|
||||
PyObject *res = NULL;
|
||||
|
||||
if (!PyArg_ParseTuple(args, _Py_PARSE_PID "i:sched_getaffinity",
|
||||
&pid, &ncpus))
|
||||
if (!PyArg_ParseTuple(args, _Py_PARSE_PID ":sched_getaffinity",
|
||||
&pid))
|
||||
return NULL;
|
||||
res = make_new_cpu_set(&cpu_set_type, ncpus);
|
||||
if (!res)
|
||||
return NULL;
|
||||
if (sched_getaffinity(pid, res->size, res->set)) {
|
||||
Py_DECREF(res);
|
||||
return posix_error();
|
||||
|
||||
ncpus = NCPUS_START;
|
||||
while (1) {
|
||||
setsize = CPU_ALLOC_SIZE(ncpus);
|
||||
mask = CPU_ALLOC(ncpus);
|
||||
if (mask == NULL)
|
||||
return PyErr_NoMemory();
|
||||
if (sched_getaffinity(pid, setsize, mask) == 0)
|
||||
break;
|
||||
CPU_FREE(mask);
|
||||
if (errno != EINVAL)
|
||||
return posix_error();
|
||||
if (ncpus > INT_MAX / 2) {
|
||||
PyErr_SetString(PyExc_OverflowError, "could not allocate "
|
||||
"a large enough CPU set");
|
||||
return NULL;
|
||||
}
|
||||
ncpus = ncpus * 2;
|
||||
}
|
||||
return (PyObject *)res;
|
||||
|
||||
res = PySet_New(NULL);
|
||||
if (res == NULL)
|
||||
goto error;
|
||||
for (cpu = 0, count = CPU_COUNT_S(setsize, mask); count; cpu++) {
|
||||
if (CPU_ISSET_S(cpu, setsize, mask)) {
|
||||
PyObject *cpu_num = PyLong_FromLong(cpu);
|
||||
--count;
|
||||
if (cpu_num == NULL)
|
||||
goto error;
|
||||
if (PySet_Add(res, cpu_num)) {
|
||||
Py_DECREF(cpu_num);
|
||||
goto error;
|
||||
}
|
||||
Py_DECREF(cpu_num);
|
||||
}
|
||||
}
|
||||
CPU_FREE(mask);
|
||||
return res;
|
||||
|
||||
error:
|
||||
if (mask)
|
||||
CPU_FREE(mask);
|
||||
Py_XDECREF(res);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
#endif /* HAVE_SCHED_SETAFFINITY */
|
||||
|
|
@ -11997,13 +11813,6 @@ INITFUNC(void)
|
|||
Py_INCREF(PyExc_OSError);
|
||||
PyModule_AddObject(m, "error", PyExc_OSError);
|
||||
|
||||
#ifdef HAVE_SCHED_SETAFFINITY
|
||||
if (PyType_Ready(&cpu_set_type) < 0)
|
||||
return NULL;
|
||||
Py_INCREF(&cpu_set_type);
|
||||
PyModule_AddObject(m, "cpu_set", (PyObject *)&cpu_set_type);
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_PUTENV
|
||||
if (posix_putenv_garbage == NULL)
|
||||
posix_putenv_garbage = PyDict_New();
|
||||
|
|
|
|||
Loading…
Reference in New Issue