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from time import time
import dask
from dask import threaded, multiprocessing, local
from random import randint
import matplotlib.pyplot as plt
def noop(x):
pass
nrepetitions = 1
def trivial(width, height):
""" Embarrassingly parallel dask """
d = {("x", 0, i): i for i in range(width)}
for j in range(1, height):
d.update({("x", j, i): (noop, ("x", j - 1, i)) for i in range(width)})
return d, [("x", height - 1, i) for i in range(width)]
def crosstalk(width, height, connections):
""" Natural looking dask with some inter-connections """
d = {("x", 0, i): i for i in range(width)}
for j in range(1, height):
d.update(
{
("x", j, i): (
noop,
[("x", j - 1, randint(0, width)) for _ in range(connections)],
)
for i in range(width)
}
)
return d, [("x", height - 1, i) for i in range(width)]
def dense(width, height):
""" Full barriers between each step """
d = {("x", 0, i): i for i in range(width)}
for j in range(1, height):
d.update(
{
("x", j, i): (noop, [("x", j - 1, k) for k in range(width)])
for i in range(width)
}
)
return d, [("x", height - 1, i) for i in range(width)]
import numpy as np
x = np.logspace(0, 4, 10)
trivial_results = dict()
for get in [dask.get, threaded.get, local.get_sync, multiprocessing.get]:
y = list()
for n in x:
dsk, keys = trivial(int(n), 5)
start = time()
get(dsk, keys)
end = time()
y.append(end - start)
trivial_results[get] = np.array(y)
########
# Plot #
########
f, (left, right) = plt.subplots(
nrows=1, ncols=2, sharex=True, figsize=(12, 5), squeeze=True
)
for get in trivial_results:
left.loglog(x * 5, trivial_results[get], label=get.__module__)
right.loglog(x * 5, trivial_results[get] / x, label=get.__module__)
left.set_title("Cost for Entire graph")
right.set_title("Cost per task")
left.set_ylabel("Duration (s)")
right.set_ylabel("Duration (s)")
left.set_xlabel("Number of tasks")
right.set_xlabel("Number of tasks")
plt.legend()
plt.savefig("images/scaling-nodes.png")
#####################
# Crosstalk example #
#####################
x = np.linspace(1, 100, 10)
crosstalk_results = dict()
for get in [threaded.get, local.get_sync]:
y = list()
for n in x:
dsk, keys = crosstalk(1000, 5, int(n))
start = time()
get(dsk, keys)
end = time()
y.append(end - start)
crosstalk_results[get] = np.array(y)
########
# Plot #
########
f, (left, right) = plt.subplots(
nrows=1, ncols=2, sharex=True, figsize=(12, 5), squeeze=True
)
for get in crosstalk_results:
left.plot(x, crosstalk_results[get], label=get.__module__)
right.semilogy(x, crosstalk_results[get] / 5000.0 / x, label=get.__module__)
left.set_title("Cost for Entire graph")
right.set_title("Cost per edge")
left.set_ylabel("Duration (s)")
right.set_ylabel("Duration (s)")
left.set_xlabel("Number of edges per task")
right.set_xlabel("Number of edges per task")
plt.legend()
plt.savefig("images/scaling-edges.png")
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