def flop_tests(n):
"""
Test the efficiency of floating point operations: one multiplication
per pass in a loop 'for i in xrange(n)'.
"""
try:
from call import loop, fempty, fwconsts, flops
fempty.__name__ = 'empty_func in F77'
fwconsts.__name__ = 'func_with_consts in F77'
except:
print 'Run f2py -c -m call call.f'
sys.exit(1)
def empty_loop(n):
for i in xrange(n):
pass
def flops_py(n):
b = 1.0000001
a = 1.1
for i in xrange(n):
a = a*b
return a
print '\n\n*** Multiplication test ***\n'
t1 = timeit.Timer('a*b*c', setup='a=1.01; b=0.98; c=0.99').timeit(n)
print n, 'multiplications in a loop'
t2 = timer(flops, (n,), repetitions=100, comment='F77:')
# result in F77 is multiplication _with_ loop
best = min(t1, t2)
print 'multiplication: python=%.2f F77=%.2f' % (t1/best, t2/best)
def run(solvers, methods, data, datasets):
results = {}
# find largest data sets:
maxsize = max([size(getattr(data, d)) for d in datasets \
if hasattr(data, d)])
print maxsize
# combine all solvers, methods, and datasets:
for s in solvers:
for m in methods:
for d in datasets:
if hasattr(solver, m) and hasattr(data, d):
f = getattr(solver, m)
x = getattr(data, d)
r = timer(f, (x,), repetitions=maxsize/size(x))
results[(m,d)] = r
return results
def timing2(n=2000):
"""Time different implementations of the extension module."""
dx = 1.0/n
g = Grid2Deff(dx=dx, dy=dx)
# here we use straight NumPy sin in a scalar context:
def myfunc(x, y):
return sin(x*y) + 8*x
expression = 'sin(x*y) + 8*x'
# here we use math.sin (=mathsin, global variable):
def myfunc(x, y):
return mathsin(x*y) + 8*x
expression = 'mathsin(x*y) + 8*x'
print 'basic NumPy module:', basic_NumPy
t1 = timer(g.ext_gridloop1, (myfunc,), repetitions=1)
t2 = timer(g.ext_gridloop2, (myfunc,), repetitions=1)
t3 = timer(g.ext_gridloop2, (expression,), repetitions=1)
print """
Results using an extension module (%dx%d grid),
with callback to Python for each point:
gridloop1 (w/func): %s
gridloop2 (w/func): %s
gridloop1 (w/string expression): %s
""" % (n, n, t1, t2, t3)
# try the improved functions (works only for the F77 module):
nrep = 20
if 'gridloop_vec2' in dir(ext_gridloop):
t4 = timer(g.ext_gridloop_vec2, (myfuncf2,), repetitions=nrep)
print """\
gridloop_vec2 (w/func & NumPy): %s""" % t4
if 'gridloop2_str' in dir(ext_gridloop):
t5 = timer(g.ext_gridloop2_str, ('myfunc',), repetitions=nrep)
print """\
gridloop2_str (no Py callback): %s""" % t5
# try 'inline' F77 compiled callback too:
# (give F77 source for core of callback function as argument)
g.ext_gridloop2_fcb_compile('sin(x*y) + 8*x')
t6 = timer(g.ext_gridloop2_fcb, (), repetitions=nrep)
g.ext_gridloop2_compile('sin(x*y) + 8*x')
t7 = timer(g.ext_gridloop2_v2, (), repetitions=nrep)
def timing(n=2000):
# timing:
dx = 1.0/n
g = Grid2D(xmin=0, xmax=1, dx=dx,
ymin=0, ymax=1, dy=dx)
expression = 'sin(x*y) + 8*x'
print 'evaluating', expression
def myfunc(x, y):
return sin(x*y) + 8*x
from py4cs.misc import timer
t0 = time.clock()
# vectorized expressions are so fast that we run the code
# repeatedly
rep=20
print 'vectorized code with eval... (%d calls)' % rep
t1 = timer(g.__call__, (expression,), repetitions=rep, comment='eval(str)')
print 'vectorized code with function call... (%d calls)' % rep
t2 = timer(g.__call__, (myfunc,), repetitions=rep, comment='myfunc')
print 'explicit loops with formula hardcoded...(1 call)'
f = g.gridloop_hardcoded_func()
t3 = timer(g.gridloop_hardcoded_func, (), repetitions=1, comment='')
print 'explicit loops with eval...(1 call)'
t4 = timer(g.gridloop, (expression,), repetitions=1, comment='eval(str)')
print 'explicit loops with myfunc...(1 call)'
t5 = timer(g.gridloop, (myfunc,), repetitions=1, comment='myfunc')
print 'explicit loops with list and eval...(1 call)'
t6 = timer(g.gridloop_list, (expression,), repetitions=1,
comment='eval(str)')
print 'explicit loops with list and myfunc...(1 call)'
t7 = timer(g.gridloop_list, (myfunc,), repetitions=1, comment='myfunc')
# The scalar computations above used sin from NumPy, which is
# known to be slow for scalar arguments. Here we use math.sin
# (stored in mathsin, could also use the slightly slower math.sin
# explicitly)
# taken globally so eval works: from math import sin as mathsin
def myfunc_scalar(x, y):
return mathsin(x*y) + 8*x
expression_scalar = 'mathsin(x*y) + 8*x'
print 'explicit loops with eval...(1 call) and math sin'
t8 = timer(g.gridloop, (expression_scalar,), repetitions=1,
comment='eval(str)')
print 'explicit loops with myfunc...(1 call) and math sin'
t9 = timer(g.gridloop, (myfunc_scalar,), repetitions=1, comment='myfunc')
# report
f = max(t1,t2) # fastest implementation
print """
Basic NumPy module: %s
vectorized with eval(expression): %.2f %.1f
vectorized with myfunc call: %.2f %.1f
scalar versions with NumPy sin function:
loops with inline formula: %.2f %.1f
loops with eval(expression): %.2f %.1f
loops with myfunc call: %.2f %.1f
loops with list and eval: %.2f %.1f
loops with list and myfunc: %.2f %.1f
scalar versions with math.sin function:
loops with eval(expression_scalar): %.2f %.1f
loops with myfunc_scalar: %.2f %.1f
""" % (basic_NumPy, t1, t1/f, t2, t2/f, t3, t3/f, t4, t4/f, t5, t5/f,
t6, t6/f, t7, t7/f, t8, t8/f, t9, t9/f)
else:
r[i] = sin(x[i])
r.shape = x.shape
return r
def somefunc_NumPy2(x):
"""Vectorized version of somefunc."""
lt0_indices = less(x, 0) # find all indices where x<0
r = sin(x)
# truncate, i.e., insert 0 for all indices where x<0:
r = where(lt0_indices, 0.0, r)
return r
somefunc_list = [somefunc_NumPy, somefunc_NumPy2]
try:
import scipy.special
somefunc_SciPy = scipy.special.general_function(somefunc)
somefunc_SciPy.__name__ = somefunc.__name__ + '_SciPy_vectorized'
somefunc_list.append(somefunc_SciPy)
except:
print 'unsuccessful scipy import, cannot use scipy'
n = 1000000
x = sequence(0, 2, 1.0 / n, Float)
from py4cs.misc import timer
for f in somefunc_list:
timer(f, (x, ), repetitions=1)
timer(somefunc_NumPy2, (x, ), repetitions=10)
print 'end of', sys.argv[0]
def allocate_tests(n):
def list_append1(n):
r = []
for i in xrange(n):
r.append(i+2)
return r
def list_chunk1(n):
r = [0.0]*n
for i in xrange(n):
r[i] = i+2
return r
def list_append2(n):
r = []
for i in xrange(n):
r.append(random.gauss(0,1))
return r
def list_chunk2(n):
r = [0.0]*n
for i in xrange(n):
r[i] = random.gauss(0,1)
return r
def list_append3(n):
g = random.gauss
r = []
for i in xrange(n):
r.append(g(0,1))
return r
def list_append4(n):
return [random.gauss(0,1) for i in xrange(n)]
def list_chunk3(n):
g = random.gauss
r = [0.0]*n
for i in xrange(n):
r[i] = g(0,1)
return r
def NumPy_zeros(n):
return zeros(n, Float)
def NumPy_arange(n):
return sequence(0,1,1.0/(n-1))
def NumPy_random(n):
import RandomArray
return RandomArray.normal(0,1,n)
print 'allocate n numbers in an array/list: n =', n
# few calls, use timer instead of timeit
rep = 3
print timer(NumPy_zeros, (n,), repetitions=rep)
print timer(NumPy_arange, (n,), repetitions=rep)
print timer(NumPy_random, (n,), repetitions=rep)
print timer(list_append1, (n,), repetitions=rep)
print timer(list_chunk1, (n,), repetitions=rep)
print timer(list_append2, (n,), repetitions=rep)
print timer(list_append4, (n,), repetitions=rep)
print timer(list_chunk2, (n,), repetitions=rep)
print timer(list_append3, (n,), repetitions=rep)
print timer(list_chunk3, (n,), repetitions=rep)
def matrixfill_tests(language, n):
from math import sin, exp
if language == 'F77':
try:
from matrix_f77 import makematrix, set, tonumpy, adump, \
fill1, fill2, lfill1, lfill2
except:
print 'Run f2py -c m matrix matrix_f77.f'
sys.exit(1)
makematrix(n, n) # make matrix in F77
elif language == 'C++':
try:
from matrix_cpp import Matrix
from _matrix_cpp import Matrix_set
import _matrix_cpp # for efficiency comparison
except:
print 'run make_cpp.sh'
sys.exit(1)
m = Matrix(n)
a = zeros((n, n), Float)
def setmatrix1_py():
"""Fill NumPy matrix in Python loop."""
for i in xrange(n):
for j in xrange(n):
a[i, j] = i*j-2
return a
def setmatrix2_py():
"""Fill NumPy matrix in Python loop; sin/exp formula."""
for i in xrange(n):
x = i*0.1
for j in xrange(n):
y = j*0.1
a[i, j] = sin(x)*sin(y)*exp(-x*y)
return a
#======== F77 functions =========
def setmatrix1_f_index():
"""Fill F77 matrix in a Python loop with F77 indexing."""
for i in xrange(n):
for j in xrange(n):
set(i, j, i*j-2)
r = tonumpy(n, n)
# could perhaps tune the interface file such that tonumpy
# doesn't need arguments
return r
def setmatrix2_f_index():
"""Fill F77 matrix in a Python loop with F77 indexing; sin/exp."""
for i in xrange(n):
x = 0.1*i
for j in xrange(n):
y = 0.1*j
set(i, j, sin(x)*sin(y)*exp(-x*y))
r = tonumpy(n, n)
return r
def setmatrix1_f_loop1():
"""Fill F77 matrix in Fortran loops."""
fill1() # all loops in F77
r = tonumpy(n, n)
return r
def setmatrix1_f_loop2():
"""Fill NumPy matrix in Fortran loops."""
r = lfill1(a) # all loops in F77, fill NumPy array
return r
def setmatrix2_f_loop1():
"""Fill F77 matrix in Fortran loops; sin/exp formula."""
fill2() # all loops in F77
r = tonumpy(n, n)
return r
def setmatrix2_f_loop2():
"""Fill NumPy matrix in Fortran loops; sin/exp formula."""
r = lfill2(a) # all loops in F77, fill NumPy array
return r
#======== C++ functions =========
def setmatrix1_c_index1():
"""Fill C++ matrix in a Python loop with F77 indexing."""
for i in xrange(n):
for j in xrange(n):
m.set(i, j, i*j-2)
# could perhaps tune the interface file such that tonumpy
# doesn't need arguments
return m
def setmatrix2_c_index1():
"""Fill F77 matrix in a Python loop with F77 indexing; sin/exp."""
for i in xrange(n):
x = 0.1*i
for j in xrange(n):
y = 0.1*j
m.set(i, j, sin(x)*sin(y)*exp(-x*y))
return m
def setmatrix1_c_index3():
"""Avoid proxy class, call Matrix_set directly."""
for i in xrange(n):
for j in xrange(n):
Matrix_set(m, i, j, i*j-2)
# could perhaps tune the interface file such that tonumpy
# doesn't need arguments
return m
def setmatrix2_c_index3():
"""Avoid proxy class, call Matrix_set directly; sin/exp formula."""
for i in xrange(n):
x = 0.1*i
for j in xrange(n):
y = 0.1*j
Matrix_set(m, i, j, sin(x)*sin(y)*exp(-x*y))
return m
def setmatrix1_c_index4():
"""Avoid proxy class, call _matrix_cpp.Matrix_set directly."""
for i in xrange(n):
for j in xrange(n):
_matrix_cpp.Matrix_set(m, i, j, i*j-2)
# could perhaps tune the interface file such that tonumpy
# doesn't need arguments
return m
def setmatrix2_c_index4():
"""Avoid proxy class, call _matrix_cpp.Matrix_set directly."""
for i in xrange(n):
x = 0.1*i
for j in xrange(n):
y = 0.1*j
_matrix_cpp.Matrix_set(m, i, j, sin(x)*sin(y)*exp(-x*y))
return m
def setmatrix1_c_loop1():
"""Fill F77 matrix in Fortran loops."""
m.fill1() # all loops in F77
return m
def setmatrix2_c_loop1():
"""Fill F77 matrix in Fortran loops; sin/exp formula."""
m.fill2() # all loops in F77
return m
#======== end of C++ functions =========
def sort(d):
"""Sort result dictionary: d[problem_description]=time."""
list = [(key, d[key]) for key in d]
def s(a, b):
"""sort list of 2-tuples"""
return cmp(a[1],b[1]) # a,b = (comment,time)
list.sort(s)
return list
if language == 'F77':
res = {}
# one multiplication in Python for each matrix entry:
t = timer(setmatrix1_py, (), repetitions=10)
res['Python loop and NumPy array'] = t
t = timer(setmatrix1_f_index , (), repetitions=10)
res['Python loop and F77 indexing in F77 array'] = t
t = timer(setmatrix1_f_loop1, (), repetitions=100)
res['F77 loop over F77 array'] = t
t = timer(setmatrix1_f_loop2, (), repetitions=100)
res['F77 loop over NumPy array'] = t
res = sort(res)
print '\n\n\nTable: a[i,j] = i*j-2\n(one mult+sub per iteration)\n'
for comment, time in res:
print '%60s %7.3f' % (comment,time)
print '\n\n'
# a sin/exp function expression for each matrix entry:
res = {}
t = timer(setmatrix2_py, (), repetitions=10)
res['Python loop and NumPy array'] = t
t = timer(setmatrix2_f_index , (), repetitions=10)
res['Python loop and F77 indexing in F77 array'] = t
t = timer(setmatrix2_f_loop1, (), repetitions=100)
res['F77 loop over F77 array'] = t
t = timer(setmatrix2_f_loop2, (), repetitions=100)
res['F77 loop over NumPy array'] = t
res = sort(res)
print '\n\n\nTable: a[i,j] = sin/exp expression\n'
for comment, time in res:
print '%60s %7.3f' % (comment,time)
print '\n\n'
elif language == 'C++':
res = {}
# one multiplication in Python for each matrix entry:
t = timer(setmatrix1_py, (), repetitions=10)
res['Python loop and NumPy array'] = t
t = timer(setmatrix1_c_index1, (), repetitions=10)
res['Indexing: m.set'] = t
t = timer(setmatrix1_c_index3, (), repetitions=10)
res['Indexing: Matrix_set'] = t
t = timer(setmatrix1_c_index4, (), repetitions=10)
res['Indexing: matrix_cpp.Matrix_set'] = t
t = timer(setmatrix1_c_loop1, (), repetitions=100)
res['C++ loop over C++ array'] = t
res = sort(res)
print '\n\n\nTable: a[i,j] = i*j-2\n(one mult+sub per iteration)\n'
for comment, time in res:
print '%60s %7.3f' % (comment,time)
print '\n\n'
# a sin/exp function expression for each matrix entry:
res = {}
t = timer(setmatrix2_py, (), repetitions=10)
res['Python loop and NumPy array'] = t
t = timer(setmatrix2_c_index1, (), repetitions=10)
res['Indexing: m.set'] = t
t = timer(setmatrix2_c_index3, (), repetitions=10)
res['Indexing: Matrix_set'] = t
t = timer(setmatrix2_c_index4, (), repetitions=10)
res['Indexing: matrix_cpp.Matrix_set'] = t
t = timer(setmatrix2_c_loop1, (), repetitions=100)
res['C++ loop over C++ array'] = t
res = sort(res)
print '\n\n\nTable: a[i,j] = sin/exp-expression\n'
for comment, time in res:
print '%60s %7.3f' % (comment,time)
print '\n\n'
def call_nargs_test(rep):
for n in range(1,101,20):
code = generate_func_with_many_args(n)
exec code in globals(), globals()
print timer(func_with_many_args, tuple(range(n)), repetitions=rep,
comment='empty func with %d arguments:' % n)
def call_tests(rep, x, y, z):
try:
from call import loop, fempty, fwconsts, flops
fempty.__name__ = 'empty_func in F77'
fwconsts.__name__ = 'func_with_consts in F77'
except:
print 'Run f2py -c -m call call.f'
sys.exit(1)
def empty_func(x, y, z):
pass
def func_with_consts1(x, y, z):
a = 0.3
b = 1.2
c = 1.22E+02
q = a*x + b*y + c*z
return q
def func_with_consts2(x, y, z, a=0.3, b=1.2, c=1.22E+02):
q = a*x + b*y + c*z
return q
def func_with_consts3(x, y, z):
# hardcoded coefficients
q = 0.3*x + 1.2*y + 1.22E+02*z
return q
def _help(x):
return x+1
def func_loop_with_call(n):
r = 0.1
for i in xrange(n):
r = _help(r)
def func_loop_with_inline(n):
r = 0.1
for i in xrange(n):
r = r + 1
# test NumPy vs math sin for scalar arguments:
# see sin_comparison.py
print '\n*** Testing function calls ***\n'
fclass1 = """
class MyFunc:
def __call__(self, x):
return 2.0
f = MyFunc()
fm = f.__call__
"""
fclass3 = """
from math import sin
class MyFunc:
def __call__(self, x, y, z):
return sin(x)*sin(y)*sin(z)
f = MyFunc()
"""
setup = """
from py4cs.numpytools import wrap2callable
from math import sin
f = wrap2callable"""
t1 = timeit.Timer('f(0.9)', setup=setup+'(2.0)').timeit(rep)
t2 = timeit.Timer('f(0.9)', setup=setup+'(lambda x: 2.0)').timeit(rep)
t3 = timeit.Timer('f(0.9)', setup=setup+'("2.0")').timeit(rep)
t4 = timeit.Timer('f(0.9)', setup=fclass1).timeit(rep)
t4b = timeit.Timer('fm(0.9)', setup=fclass1).timeit(rep)
t5 = timeit.Timer('f(0.9)', setup='def f(x): return 2.0').timeit(rep)
t6 = timeit.Timer('f(0.9, 0.1, 1)', setup=setup+'(2.0)').timeit(rep)
t7 = timeit.Timer('f(0.9, 0.1, 1)', setup=setup+'(lambda x,y,z: 2.0)').timeit(rep)
t8 = timeit.Timer('f(0.9, 0.1, 1)', setup=setup+'("2.0")').timeit(rep)
t9 = timeit.Timer('f(1,1,1)',
setup=setup+'(lambda x,y,z: sin(x)*sin(y)*sin(z))').timeit(rep)
t10 = timeit.Timer('f(1,1,1)',
setup=setup+'("sin(x)*sin(y)*sin(z)", ' + \
'independent_variables=("x","y","z"))').timeit(rep)
t11 = timeit.Timer('f(1,1,1)', setup=fclass3).timeit(rep)
best = min(t1, t2, t3, t4, t5, t6, t7, t8, t9 ,t10, t11)
best3 = min(t9, t10, t11)
print """
overhead with wrap2callable: constant function 2.0 (best=%f)
f = wrap2callable(2.0); f(0.9) %.2f const
f = wrap2callable(lambda x: 2.0); f(0.9) %.2f func
f = wrap2callable("2.0"); f(0.9) %.2f StringFunction
function object %.2f
%s
function object f: fm = f.__call__, fm(0.9) %.2f
def f(x): return 2.0 %.2f func
increasing the number of arguments:
f = wrap2callable(2.0); f(0.9, 0.1, 1) %.2f const
f = wrap2callable(lambda x,y,z: 2.0); f(0.9, 0.1, 1) %.2f func
f = wrap2callable("2.0"); f(0.9, 0.1, 1) %.2f StringFunction
f = wrap2callable(lambda x,y,z: sin(x)*sin(y)*sin(z)) %.2f %.2f
f = wrap2callable("sin(x)*sin(y)*sin(z)"); f(1,1,1) %.2f %.2f
function object %.2f %.2f
%s
""" % (best, t1/best, t2/best, t3/best, t4/best, fclass1, t4b/best,
t5/best, t6/best, t7/best, t8/best, t9/best, t9/best3,
t10/best, t10/best3, t11/best, t11/best3, fclass3)
# F77 versions:
print timer(empty_func, (x, y, z), repetitions=rep)
f77rep = 100
c = timer(loop, (f77rep*rep, 'fempty'), repetitions=1,
comment='loop over fempty in F77:')
print c/float(f77rep*rep) # time for a single call
print timer(fwconsts, (x, y, z), repetitions=rep)
c = timer(loop, (f77rep*rep, 'fwconsts'), repetitions=1,
comment='loop over fwconsts in F77:')
print c/float(f77rep*rep)
print timer(empty_func, (x, y, z), repetitions=rep, comment='no body:')
print timer(func_with_consts1, (x, y, z), repetitions=rep,
comment='constants in statements:')
print timer(func_with_consts2, (x, y, z), repetitions=rep,
comment='constants as default kwargs:')
print timer(func_with_consts3, (x, y, z), repetitions=rep,
comment='constants hardcoded:')
print timer(func_loop_with_call, (rep,), repetitions=1,
comment='loop with function call:')
print timer(func_loop_with_inline, (rep,), repetitions=1,
comment='loop with inline expression:')
m = 10*rep
t1 = timeit.Timer('myfunc(2)', setup='def myfunc(x): return x').timeit(m)
t2 = timeit.Timer('isinstance(x,list)', setup='x=(1,2,3)').timeit(m)
print 'isinstance is %.2f times slower than a trivial func' % (t2/t1)
call_nargs_test(rep)
"""
print 'import error (from call import ...):', msg
print 'Run f2py -c -m call call.f'
sys.exit(1)
# 2D grid:
print '\n\n'
m0 = sqrt(n)
#m0 = 1600
for j in (4, 2, 1):
m = m0/j
print '\n\ninitializing a %dx%d array\n' % (m,m)
x = seq(0, 1, 1/float(m-1))
y = x.copy()
u = zeros((len(x), len(y)), Float)
t1 = timer(py_loop3_2Dsincos, args=(x,y), repetitions=1*j)
t1 = timer(py_loop2_2Dsincos, args=(x,y), repetitions=1*j)
t1 = timer(py_loop1_2Dsincos, args=(x,y), repetitions=1*j)
print 'pure Python loop:%d u[i,j]=sin(x[i])*cos(y[j]):' % size(u), t1
from py4cs.numpytools import sin, cos # ensure vectorized versions
t2 = timer(NumPy_loop1_2Dsincos, args=(x,y), repetitions=20*j)
print 'NumPy:%d u=sin(x)*cos(y):' % size(u), t2
# numarray does not work 100% with f2py:
if not isinstance(u, NumArray):
import call
u = call.as_column_major_storage(u)
t3a = timer(F77_loop1_2Dsincos, args=(u,x,y), repetitions=20*j,
comment='call I1')
t3b = timer(F77_loop2_2Dsincos, args=(u,x,y), repetitions=20*j,
comment='inline')
t3c = timer(F77_loop3_2Dsincos, args=(u,x,y), repetitions=20*j,
