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import unittest
from petsc4py import PETSc
from sys import getrefcount
import platform
test_machine = platform.machine()
# --------------------------------------------------------------------
class MyODE:
"""
du/dt + u**2 = 0;
u0 = 1
"""
def __init__(self):
self.function_calls = 0
self.jacobian_calls = 0
def function(self, ts, t, u, du, F):
# print 'MyODE.function()'
self.function_calls += 1
f = du + u * u
f.copy(F)
def jacobian(self, ts, t, u, du, a, J, P):
# print 'MyODE.jacobian()'
self.jacobian_calls += 1
P.zeroEntries()
diag = a + 2 * u
P.setDiagonal(diag)
P.assemble()
if J != P:
J.assemble()
return False # same_nz
class MyTS:
def __init__(self):
self.log = {}
def _log(self, method, *args):
self.log.setdefault(method, 0)
self.log[method] += 1
def create(self, ts, *args):
self._log('create', *args)
self.vec_update = PETSc.Vec()
def destroy(self, ts, *args):
self._log('destroy', *args)
self.vec_update.destroy()
def setFromOptions(self, ts, *args):
self._log('setFromOptions', *args)
def setUp(self, ts, *args):
self._log('setUp', ts, *args)
self.vec_update = ts.getSolution().duplicate()
def reset(self, ts, *args):
self._log('reset', ts, *args)
def solveStep(self, ts, t, u, *args):
self._log('solveStep', ts, t, u, *args)
ts.snes.solve(None, u)
def adaptStep(self, ts, t, u, *args):
self._log('adaptStep', ts, t, u, *args)
return (ts.getTimeStep(), True)
class TestTSPython(unittest.TestCase):
def setUp(self):
self.ts = PETSc.TS()
self.ts.createPython(MyTS(), comm=PETSc.COMM_SELF)
eft = PETSc.TS.ExactFinalTime.STEPOVER
self.ts.setExactFinalTime(eft)
ctx = self.ts.getPythonContext()
self.assertEqual(getrefcount(ctx), 3)
self.assertEqual(ctx.log['create'], 1)
self.nsolve = 0
def tearDown(self):
ctx = self.ts.getPythonContext()
self.assertEqual(getrefcount(ctx), 3)
self.assertTrue('destroy' not in ctx.log)
self.ts.destroy() # XXX
self.ts = None
PETSc.garbage_cleanup()
self.assertEqual(ctx.log['destroy'], 1)
self.assertEqual(getrefcount(ctx), 2)
def testGetType(self):
ctx = self.ts.getPythonContext()
pytype = f'{ctx.__module__}.{type(ctx).__name__}'
self.assertTrue(self.ts.getPythonType() == pytype)
@unittest.skipIf('ppc' in test_machine, "testSolve segfaults on ppc arches")
def testSolve(self):
ts = self.ts
ts.setProblemType(ts.ProblemType.NONLINEAR)
ode = MyODE()
J = PETSc.Mat().create(ts.comm)
J.setSizes(3)
J.setFromOptions()
J.setUp()
u, f = J.createVecs()
ts.setAppCtx(ode)
ts.setIFunction(ode.function, f)
ts.setIJacobian(ode.jacobian, J, J)
ts.snes.ksp.pc.setType('none')
T0, dT, nT = 0.0, 0.1, 10
T = T0 + nT * dT
ts.setTime(T0)
ts.setTimeStep(dT)
ts.setMaxTime(T)
ts.setMaxSteps(nT)
ts.setFromOptions()
u[0], u[1], u[2] = 1, 2, 3
ts.solve(u)
self.nsolve += 1
self.assertTrue(ode.function_calls > 0)
self.assertTrue(ode.jacobian_calls > 0)
ctx = self.ts.getPythonContext()
ncalls = self.nsolve * ts.step_number
self.assertTrue(ctx.log['solveStep'] == ncalls)
self.assertTrue(ctx.log['adaptStep'] == ncalls)
del ctx
dct = self.ts.getDict()
self.assertTrue('__appctx__' in dct)
self.assertTrue('__ifunction__' in dct)
self.assertTrue('__ijacobian__' in dct)
@unittest.skipIf('ppc' in test_machine, "indirectly triggers segfault on ppc arches")
def testFDColor(self):
#
ts = self.ts
ts.setProblemType(ts.ProblemType.NONLINEAR)
ode = MyODE()
J = PETSc.Mat().create(ts.comm)
J.setSizes(5)
J.setType('aij')
J.setPreallocationNNZ(1)
J.setFromOptions()
u, f = J.createVecs()
ts.setAppCtx(ode)
ts.setIFunction(ode.function, f)
ts.setIJacobian(ode.jacobian, J, J)
T0, dT, nT = 0.00, 0.1, 10
T = T0 + nT * dT
ts.setTime(T0)
ts.setTimeStep(dT)
ts.setMaxTime(T)
ts.setMaxSteps(nT)
ts.setFromOptions()
u[:] = 1, 2, 3, 4, 5
ts.setSolution(u)
ode.jacobian(ts, 0.0, u, u, 1.0, J, J)
ts.snes.setUseFD(True)
ts.solve(u)
self.nsolve += 1
@unittest.skipIf('ppc' in test_machine, "testResetAndSolve segfaults on ppc arches")
def testResetAndSolve(self):
self.ts.reset()
self.ts.setStepNumber(0)
self.testSolve()
self.ts.reset()
self.ts.setStepNumber(0)
self.testFDColor()
self.ts.reset()
self.ts.setStepNumber(0)
self.testSolve()
self.ts.reset()
def testSetAdaptLimits(self):
self.ts.setStepLimits(1.0, 2.0)
hmin, hmax = self.ts.getStepLimits()
self.assertEqual(1.0, hmin)
self.assertEqual(2.0, hmax)
# --------------------------------------------------------------------
if __name__ == '__main__':
unittest.main()
# --------------------------------------------------------------------
|
