Created
February 3, 2016 18:33
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| import timeit | |
| from StringIO import StringIO | |
| from cStringIO import StringIO as cStringIO | |
| from tempfile import TemporaryFile | |
| closure = dict() | |
| def generate_test_data(size=1000): | |
| closure.clear() | |
| closure['test_data'] = bytearray((val % 256 for val in xrange(0, size))) | |
| closure['one_stringio'] = StringIO() | |
| closure['one_cstringio'] = cStringIO() | |
| closure['one_tempfile'] = TemporaryFile() | |
| def write_and_read_test_data(flo): | |
| flo.write(closure['test_data']) | |
| flo.seek(0) | |
| closure['output'] = flo.read() | |
| def use_stringio(): | |
| flo = StringIO() | |
| write_and_read_test_data(flo) | |
| flo.close() | |
| def use_cstringio(): | |
| flo = cStringIO() | |
| write_and_read_test_data(flo) | |
| flo.close() | |
| def use_tempfile(): | |
| flo = TemporaryFile() | |
| write_and_read_test_data(flo) | |
| flo.close() | |
| def use_one_stringio(): | |
| flo = closure['one_stringio'] | |
| flo.seek(0) | |
| flo.truncate() | |
| write_and_read_test_data(flo) | |
| def use_one_cstringio(): | |
| flo = closure['one_cstringio'] | |
| flo.seek(0) | |
| flo.truncate() | |
| write_and_read_test_data(flo) | |
| def use_one_tempfile(): | |
| flo = closure['one_tempfile'] | |
| flo.seek(0) | |
| flo.truncate() | |
| write_and_read_test_data(flo) | |
| def sizeof_fmt(num, suffix='B'): | |
| for unit in ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']: | |
| if abs(num) < 1024.0: | |
| return "%3.1f%s%s" % (num, unit, suffix) | |
| num /= 1024.0 | |
| return "%.1f%s%s" % (num, 'Yi', suffix) | |
| def profile(test_name, test_function, passes): | |
| results = timeit.repeat(test_function, repeat=3, number=passes) | |
| print '{:15} {:.4f} {:.4f} {:.4f}'.format(test_name + ':', *results) | |
| def trial(passes, size): | |
| print 'Using {} passes with size {}'.format(passes, sizeof_fmt(size)) | |
| generate_test_data(size) | |
| profile('New StringIO', use_stringio, passes) | |
| profile('Same StringIO', use_one_stringio, passes) | |
| closure['one_stringio'].close() | |
| profile('New cStringIO', use_cstringio, passes) | |
| profile('Same cStringIO', use_one_cstringio, passes) | |
| closure['one_cstringio'].close() | |
| profile('New tempfile', use_tempfile, passes) | |
| profile('Same tempfile', use_one_tempfile, passes) | |
| closure['one_tempfile'].close() | |
| print '==============================================================' | |
| if __name__ == '__main__': | |
| trial(1000, 1024) | |
| trial(1000, 1024 * 100) | |
| trial(1000, 1024 * 1024) | |
| trial(1000, 1024 * 1024 * 10) |
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