Calling ArrayQueue.get() does not clear memory about arrayqueues HOT 3 CLOSED

This is a very special case which occurs, as far as I can deduce, only when you make the queue fit exactly one element. This is far from the use cases this package is considered for, however if it proves necessary, I can try to figure out a consistent way to handle this.

For sharing a single array, consider a thin wrapper around the multiprocessing Array class, like ArrayView in this package.

Lastly, if you use threading, this is not even necessary, as due to the python global interpreter lock only one thread per process is allowed. So there are no real separate threads and no need arises to consider memory sharing, as I think all memory should be accessible to all "threads", of course without the parallelization benefits.

from arrayqueues.

I tried increasing the queue size so that it was 4x as large as the array i was storing in the queue. This test code (which has an infinite loop that gets, then puts an array) will crash in about 10 seconds. I increased the queue buffer to 8x the array size i was inserting, and i was able to get the test code to run without crashing. Allocating less memory than this (less memory than 8x the array size) to the arrayqueue would result in a crash. Here is my test code:

from arrayqueues.shared_arrays import ArrayQueue
import threading
import numpy as np
import time

class ReadProcess(threading.Thread):
    def __init__(self, queue):
        super().__init__()
        self.queue = queue
      
    def run(self):
        a = self.queue.get()
        print("Is queue empty (from child thread): {}".format(queue.empty()))

if __name__ == "__main__":
    create_start = time.time()
    queue = ArrayQueue(32/1000) # intitialises an ArrayQueue which can hold 32 KB of data
    numbers = np.random.uniform(10000, size = 1000)  #this is 8 KB in size
    numbers_copy = np.copy(numbers)
    queue.put(numbers_copy)
    thread = ReadProcess(queue)
    thread.start()
    thread.join()
    print("Is queue empty(from main thread): {}".format(queue.empty()))
    while True:  #infinite loop, this code is used to test for memory crashes
        queue.put(numbers_copy)
        queue.get()
    create_end = time.time()
    print("execution time: {}".format(create_end - create_start))

from arrayqueues.

Old issue, this does not seem to be crashing on my machine, I'll close for now.

from arrayqueues.