from __future__ import print_function

import sys
import numpy
import tables
from time import time
#import psyco

filename = "/tmp/LRU-bench.h5"
nodespergroup = 250
niter = 100

print('nodespergroup:', nodespergroup)
print('niter:', niter)

if len(sys.argv) > 1:
    NODE_CACHE_SLOTS = int(sys.argv[1])
    print('NODE_CACHE_SLOTS:', NODE_CACHE_SLOTS)
else:
    NODE_CACHE_SLOTS = tables.parameters.NODE_CACHE_SLOTS
f = tables.open_file(filename, "w", node_cache_slots=NODE_CACHE_SLOTS)
g = f.create_group("/", "NodeContainer")
print("Creating nodes")
for i in range(nodespergroup):
    f.create_array(g, "arr%d" % i, [i])
f.close()

f = tables.open_file(filename)


def iternodes():
#     for a in f.root.NodeContainer:
#         pass
    indices = numpy.random.randn(nodespergroup * niter) * \
        30 + nodespergroup / 2.
    indices = indices.astype('i4').clip(0, nodespergroup - 1)
    g = f.get_node("/", "NodeContainer")
    for i in indices:
        a = f.get_node(g, "arr%d" % i)
        # print("a-->", a)

print("reading nodes...")
# First iteration (put in LRU cache)
t1 = time()
for a in f.root.NodeContainer:
    pass
print("time (init cache)-->", round(time() - t1, 3))


def timeLRU():
    # Next iterations
    t1 = time()
#     for i in range(niter):
#         iternodes()
    iternodes()
    print("time (from cache)-->", round((time() - t1) / niter, 3))


def profile(verbose=False):
    import pstats
    import cProfile as prof
    prof.run('timeLRU()', 'out.prof')
    stats = pstats.Stats('out.prof')
    stats.strip_dirs()
    stats.sort_stats('time', 'calls')
    if verbose:
        stats.print_stats()
    else:
        stats.print_stats(20)

# profile()
# psyco.bind(timeLRU)
timeLRU()

f.close()

# for N in 0 4 8 16 32 64 128 256 512 1024 2048 4096; do
#     env PYTHONPATH=../build/lib.linux-x86_64-2.7 \
#     python LRUcache-node-bench.py $N;
# done