/usr/share/doc/python-tables-doc/bench/create-large-number-objects.py is in python-tables-doc 3.3.0-5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | "This creates an HDF5 file with a potentially large number of objects"
import sys
import numpy
import tables
filename = sys.argv[1]
# Open a new empty HDF5 file
fileh = tables.open_file(filename, mode="w")
# nlevels -- Number of levels in hierarchy
# ngroups -- Number of groups on each level
# ndatasets -- Number of arrays on each group
# LR: Low ratio groups/datasets
#nlevels, ngroups, ndatasets = (3, 1, 1000)
# MR: Medium ratio groups/datasets
nlevels, ngroups, ndatasets = (3, 10, 100)
#nlevels, ngroups, ndatasets = (3, 5, 10)
# HR: High ratio groups/datasets
#nlevels, ngroups, ndatasets = (30, 10, 10)
# Create an Array to save on disk
a = numpy.array([-1, 2, 4], numpy.int16)
group = fileh.root
group2 = fileh.root
for k in range(nlevels):
for j in range(ngroups):
for i in range(ndatasets):
# Save the array on the HDF5 file
fileh.create_array(group2, 'array' + str(i),
a, "Signed short array")
# Create a new group
group2 = fileh.create_group(group, 'group' + str(j))
# Create a new group
group3 = fileh.create_group(group, 'ngroup' + str(k))
# Iterate over this new group (group3)
group = group3
group2 = group3
fileh.close()
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