Performance issue

[jhuguetn]

Performance issue found when attempting to get a list of file labels of a Resource object.

Using EObject label() method generates a per-file new GET request to the whole list of resource files which -in my opinion- is highly redundant and rather slow when resource has lots of files (see test below).

Performance test with ASHS resource of ~790 files using label() method:

import timeit
code1 = """
import pyxnat
c = pyxnat.Interface(config='.pyxnat.cfg')
flist = c.select.experiment('ACME_E00001').resource('ASHS').files()
fnamelist = [f.label() for f in flist]
"""
elapsed_time = timeit.timeit(code1, number=10)/10
print(elapsed_time)

67.44406228000298

Same test using _urn private property (see here):

import timeit
code2 = """
import pyxnat
c = pyxnat.Interface(config='.pyxnat.cfg')
flist = c.select.experiment('ACME_E00001').resource('ASHS').files()
fnamelist = [f._urn for f in flist]
"""
elapsed_time = timeit.timeit(code2, number=10)/10
print(elapsed_time)

0.18539366999757476