def gather(s, nums, source, vanilla=0):
"""Wrapper for easy MPI Gather receive.
Receive data from source with tag.
Create appropriate buffer and receive data.
"""
control_info = get_control_info(s)
protocol = control_info[0]
typecode = control_info[1]
s_size = nums
if protocol == 'array':
import Numeric
x = Numeric.zeros(s_size * size(), typecode)
gather_array(s, s_size, x, source)
elif protocol == 'string':
x = ' ' * s_size * size()
gather_string(s, s_size, x, source)
elif protocol == 'vanilla':
raise "Protocol: %s unsupported for gather" % protocol
else:
raise "Unknown values for protocol: %s" % protocol
return x
def gather(s, nums, source, vanilla=0):
"""Wrapper for easy MPI Gather receive.
Receive data from source with tag.
Create appropriate buffer and receive data.
"""
control_info = get_control_info(s)
protocol = control_info[0]
typecode = control_info[1]
s_size = nums
if protocol == 'array':
import Numeric
x = Numeric.zeros(s_size * size(),typecode)
gather_array(s, s_size, x, source)
elif protocol == 'string':
x = ' '*s_size*size()
gather_string(s, s_size, x, source)
elif protocol == 'vanilla':
raise "Protocol: %s unsupported for gather" %protocol
else:
raise "Unknown values for protocol: %s" %protocol
return x
def gather(x, root, buffer=None, vanilla=0):
"""Gather values from all processes to root
Create appropriate buffer and receive data.
Gather only makes sens for arrays or strings
"""
import types
from mpiext import size
numproc = size() #Needed to determine buffer size
#Input check
errmsg = 'Root id (%s) must be an integer.' %root
assert type(root) == types.IntType, errmsg
#Create metadata about object to be gathered
protocol, typecode, size, shape = create_control_info(x)
#Gather
if protocol == 'array':
if buffer is None:
import Numeric
buffer = Numeric.zeros(size*numproc, typecode)
# Modify shape along axis=0 to match size
shape = list(shape)
shape[0] *= numproc
buffer = Numeric.reshape(buffer, shape)
gather_array(x, buffer, root)
elif protocol == 'string':
if buffer is None:
buffer = ' '*size*numproc
gather_string(x, buffer, root)
elif protocol == 'vanilla':
errmsg = 'Gather is only supported for Numeric arrays and strings.\n'
errmsg += 'If you wish to distribute a general sequence, '
errmsg += 'please use send and receive commands or broadcast.'
raise errmsg
else:
raise 'Unknown protocol: %s' %protocol
return buffer
def gather(x, root, buffer=None, vanilla=0):
"""Gather values from all processes to root
Create appropriate buffer and receive data.
Gather only makes sens for arrays or strings
"""
import types
from mpiext import size
numproc = size() #Needed to determine buffer size
#Input check
errmsg = 'Root id (%s) must be an integer.' % root
assert type(root) == types.IntType, errmsg
#Create metadata about object to be gathered
protocol, typecode, size, shape = create_control_info(x)
#Gather
if protocol == 'array':
if buffer is None:
import Numeric
buffer = Numeric.zeros(size * numproc, typecode)
# Modify shape along axis=0 to match size
shape = list(shape)
shape[0] *= numproc
buffer = Numeric.reshape(buffer, shape)
gather_array(x, buffer, root)
elif protocol == 'string':
if buffer is None:
buffer = ' ' * size * numproc
gather_string(x, buffer, root)
elif protocol == 'vanilla':
errmsg = 'Gather is only supported for Numeric arrays and strings.\n'
errmsg += 'If you wish to distribute a general sequence, '
errmsg += 'please use send and receive commands or broadcast.'
raise errmsg
else:
raise 'Unknown protocol: %s' % protocol
return buffer
def raw_gather(s, nums, d, source, vanilla=0):
"""Wrapper for MPI gather.
Gather first nums elements in s to d (of the same size) from source.
Automatically determine appropriate protocol
and call corresponding send function.
The variable s can be any (picklable) type, but
Numeric variables and text strings will most efficient.
Setting vanilla = 1 forces vanilla mode for any type.
"""
protocol = get_control_info(s, vanilla)[0]
if protocol == 'array':
gather_array(s, nums, d, source)
elif protocol == 'string':
gather_string(s, nums, d, source)
elif protocol == 'vanilla':
raise "Protocol: %s unsupported for gather" % protocol
else:
raise "Unknown values for protocol: %s" % protocol
return d
def raw_gather(s, nums, d, source, vanilla=0):
"""Wrapper for MPI gather.
Gather first nums elements in s to d (of the same size) from source.
Automatically determine appropriate protocol
and call corresponding send function.
The variable s can be any (picklable) type, but
Numeric variables and text strings will most efficient.
Setting vanilla = 1 forces vanilla mode for any type.
"""
protocol = get_control_info(s, vanilla)[0]
if protocol == 'array':
gather_array(s, nums, d, source)
elif protocol == 'string':
gather_string(s, nums, d, source)
elif protocol == 'vanilla':
raise "Protocol: %s unsupported for gather" %protocol
else:
raise "Unknown values for protocol: %s" %protocol
return d
