[New-bugs-announce] [issue34168] RAM consumption too high using concurrent.futures (Python 3.7 / 3.6 )
Dem
report at bugs.python.org
Fri Jul 20 08:53:50 EDT 2018
New submission from Dem <edema4401 at gmail.com>:
I have a list of 30 million strings, and I want to run a dns query to all of them. I do not understand how this operation can get memory intensive. I would assume that the threads would exit after the job is done, and there is also a timeout of 1 minute as well ({'dns_request_timeout': 1}).
Here is a sneak peek of the machine's resources while running the script:
[![enter image description here][1]][1]
My code is as follows:
# -*- coding: utf-8 -*-
import dns.resolver
import concurrent.futures
from pprint import pprint
from json import json
bucket = json.load(open('30_million_strings.json','r'))
def _dns_query(target, **kwargs):
global bucket
resolv = dns.resolver.Resolver()
resolv.timeout = kwargs['function']['dns_request_timeout']
try:
resolv.query(target + '.com', kwargs['function']['query_type'])
with open('out.txt', 'a') as f:
f.write(target + '\n')
except Exception:
pass
def run(**kwargs):
global bucket
temp_locals = locals()
pprint({k: v for k, v in temp_locals.items()})
with concurrent.futures.ThreadPoolExecutor(max_workers=kwargs['concurrency']['threads']) as executor:
future_to_element = dict()
for element in bucket:
future = executor.submit(kwargs['function']['name'], element, **kwargs)
future_to_element[future] = element
for future in concurrent.futures.as_completed(future_to_element):
result = future_to_element[future]
run(function={'name': _dns_query, 'dns_request_timeout': 1, 'query_type': 'MX'},
concurrency={'threads': 15})
[1]: https://i.stack.imgur.com/686SW.png
----------
components: Library (Lib)
messages: 322004
nosy: DemGiran
priority: normal
severity: normal
status: open
title: RAM consumption too high using concurrent.futures (Python 3.7 / 3.6 )
versions: Python 3.6, Python 3.7
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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34168>
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