Skip to main content
Warning: You are using the test version of PyPI. This is a pre-production deployment of Warehouse. Changes made here affect the production instance of TestPyPI (testpypi.python.org).
Help us improve Python packaging - Donate today!

Parallel task graph framework.

Project Description

TaskGraph:

About TaskGraph

TaskGraph is great.

TaskGraph Dependencies

Task Graph is written in pure Python, but if the psutils package is installed the distributed multiprocessing processeses will be niced.

Example Use

Install taskgraph with

pip install taskgraph

Then

def _create_list_on_disk(value, length, target_path):
    """Create a numpy array on disk filled with value of `size`."""
    target_list = [value] * length
    pickle.dump(target_list, open(target_path, 'wb'))


def _sum_lists_from_disk(list_a_path, list_b_path, target_path):
    """Read two lists, add them and save result."""
    list_a = pickle.load(open(list_a_path, 'rb'))
    list_b = pickle.load(open(list_b_path, 'rb'))
    target_list = []
    for a, b in zip(list_a, list_b):
        target_list.append(a+b)
    pickle.dump(target_list, open(target_path, 'wb'))

# create a taskgraph that uses 4 multiprocessing subprocesses when possible
task_graph = taskgraph.TaskGraph(self.workspace_dir, 4)
target_a_path = os.path.join(self.workspace_dir, 'a.dat')
target_b_path = os.path.join(self.workspace_dir, 'b.dat')
result_path = os.path.join(self.workspace_dir, 'result.dat')
result_2_path = os.path.join(self.workspace_dir, 'result2.dat')
value_a = 5
value_b = 10
list_len = 10
task_a = task_graph.add_task(
    target=_create_list_on_disk,
    args=(value_a, list_len, target_a_path),
    target_path_list=[target_a_path])
task_b = task_graph.add_task(
    target=_create_list_on_disk,
    args=(value_b, list_len, target_b_path),
    target_path_list=[target_b_path])
sum_task = task_graph.add_task(
    target=_sum_lists_from_disk,
    args=(target_a_path, target_b_path, result_path),
    target_path_list=[result_path],
    dependent_task_list=[task_a, task_b])
sum_task.join()

# expect that result is a list `list_len` long with `value_a+value_b` in it
result = pickle.load(open(result_path, 'rb'))
Release History

Release History

This version
History Node

0.2.4

History Node

0.2.3

History Node

0.1.2

History Node

0.1.1

Download Files

Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
taskgraph-0.2.4-py2-none-any.whl (8.3 kB) Copy SHA256 Checksum SHA256 2.7 Wheel Sep 19, 2017
taskgraph-0.2.4.tar.gz (6.2 kB) Copy SHA256 Checksum SHA256 Source Sep 19, 2017

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting