dusenberrymw

import numpy as np

# the function
def f_of_x(X, w):
    n,d = X.shape
    X_dot_w = np.dot(X,w)
    y = np.zeros(n)
    # the inner product randomly goes through a sin
    # or a cos
    cos_flag = np.random.randn(n) < 0.0

dusenberrymw

Using strace and lsof to debug blocked processes

You can use strace on a specific pid to figure out what a specific process is doing, e.g.:

strace -fp <pid>

You might see something like:

select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)