Generates a new SDM

In [1]:

    

import sdm as sdmlib


    

In [2]:

    

bits = 1000
sample = 1000000
scanner_type = sdmlib.SDM_SCANNER_OPENCL


    

In [3]:

    

# Generate an address space with 1,000,000 random 1,000-bit bitstrings.
address_space = sdmlib.AddressSpace.init_random(bits, sample)

# Generate 1,000,000 counters initialized with value zero in the RAM memory.
counter = sdmlib.Counter.init_zero(bits, sample)

# Create a file to store the 1,000,000 counters initialized with value zero.
# You do not need to provide file extension, because it will generate two files
# and automatically included the extension for you.
#counter = sdmlib.Counter.create_file('sdm-10w', bits, sample)

# Create an SDM with the generated address space and counter.
# The scans will be performed using the OpenCL scanner.
sdm = sdmlib.SDM(address_space, counter, 451, scanner_type)


    

In [4]:

    

v = []
for i in xrange(10):
    print i,
    # Generate a random 1,000-bit bitstring.
    b = sdmlib.Bitstring.init_random(1000)
    
    # Write the bitstring to the SDM.
    sdm.write(b, b)
    v.append(b)
print ''
print '{} bitstring wrote into memory.'.format(len(v))


    

    




0 1 2 3 4 5 6 7 8 9 
10 bitstring wrote into memory.

In [5]:

    

# Copy the bitstring from v[0].
# We have to make a copy because the flip_random_bits function changes the bitstring itself.
b = sdmlib.Bitstring.init_from_bitstring(v[0])
b.flip_random_bits(400)

# Read the bitstring from the SDM and checks the distance from the retrieved bitstring and v[0].
c = sdm.read(b)
print 'Distance', c.distance_to(v[0])


    

    




Distance 134

In [6]:

    

# Save the address space into the file 'sdm-10w.as'.
# The recommended extension for an address space is '.as'.

# Although we have used 10w as an indication of 10 writes to the memory, the
# address space is not affected by the writes. It is just a reference to help us
# remeber that this address space has been used together with the counters.
#address_space.save('sdm-10w.as');


    

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