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  <div id="topcontainer">
  <ul>
    <li>Background Processing
    <li>Distributed
    <li>Asynchronous/Synchronous
    <li>Concurrency
    <li>Periodic Tasks
    <li>Retries
  </ul>
  </div>

  <div id="contentcontainer">

    <div class="column">
        <h2>Distributed Task Queue</h2>
        <p> Celery is an asynchronous task queue/job queue based on distributed message passing.
        It is focused on real-time operation, but supports scheduling as well.</p>

        <p>The execution units, called tasks, are executed concurrently on a single or
        more worker servers using multiprocessing, <a href="http://eventlet.net">Eventlet</a>,
        or <a href="http://gevent.org">gevent</a>. Tasks can execute asynchronously (in the background) or synchronously
        (wait until ready).</p>

        <p>Celery is used in production systems to process millions of tasks a day.</p>

        <p>Celery is written in Python, but the protocol can be implemented in any
        language.
        It can also <a href="http://docs.celeryproject.org/userguide/remote-tasks.html"
        >operate with other languages</a> using webhooks.</p>

    <p>The recommended message broker is <a href="http://rabbitmq.com/">RabbitMQ</a>,
        but limited support for <a href="http://redisdb.com/">Redis</a>, <a
            href="http://kr.github.com/beanstalkd/">Beanstalk</a>, <a
            href="http://www.mongodb.org/">MongoDB</a>, <a
            href="http://couchdb.apache.org/">CouchDB</a>, and databases
        (using <a href="http://www.sqlalchemy.org/">SQLAlchemy</a> or the <a
            href="http://djangoproject.com">Django ORM</a>) is also available.</p>

        Celery is easy to integrate with Django, Pylons and Flask, using
        the <a href="http://pypi.python.org/pypi/django-celery">django-celery</a>,
        <a href="http://pypi.python.org/pypi/celery-pylons">celery-pylons</a>
        and <a href="http://pypi.python.org/pypi/Flask-Celery">Flask-Celery</a> add-on packages.

        <h3>Example</h3>
        <p>This is a simple task adding two numbers:</p>
<div class="highlight"><pre><span class="kn">from</span> <span class="nn">celery.task</span> <span class="kn">import</span> <span class="n">task</span>

<span class="nd">@task</span>
<span class="k">def</span> <span class="nf">add</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span>
    <span class="k">return</span> <span class="n">x</span> <span class="o">+</span> <span class="n">y</span>
</pre></div>

        <p>You can execute the task in the background, or wait for it to
        finish:</p>

<div class="highlight"><pre><span class="o">&gt;&gt;&gt;</span> <span class="n">result</span> <span class="o">=</span> <span class="n">add</span><span class="o">.</span><span class="n">delay</span><span class="p">(</span><span class="mi">8</span><span class="p">,</span> <span class="mi">8</span><span class="p">)</span>
<span class="o">&gt;&gt;&gt;</span> <span class="n">result</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span> <span class="c"># wait for and return the result</span>
<span class="mi">16</span>
</pre></div>

    <h3>Getting Started</h3>

    <ol>
        <li>Install celery by download or <code>pip install -U Celery</code></li>
        <li>Set up <a href="http://docs.celeryproject.org/getting-started/broker-installation.html">RabbitMQ</a>
        or one of the <a href="http://docs.celeryproject.org/tutorials/otherqueues.html">ghetto queue</a>
        solutions.
        <li>Select one of the following guides:
        <ul>
            <li><a
                href="http://docs.celeryproject.org/getting-started/first-steps-with-celery.html">First steps with Python</a></li>
            <li><a href="http://docs.celeryproject.org/django-celery/getting-started/first-steps-with-django.html">First steps with Django</a></li>
        </ul>
    </ol>

    <h3>Community</h3>

    <p>There is a <a href="http://groups.google.com/group/celery-users">mailing-list</a>
    available for general discussion.</p>

    <p>For those craving real, human interaction, there is also an IRC channel
    (<code>#celery</code> on <code>irc.freenode.net</code>).</p>

    <p>Finally, if you find a bug or would like to request a feature,
    please <a href="http://github.com/ask/celery/issues">submit an
        issue</a>.</p>

    <a name="donate"></a>
    <h3>Donate</h3>
    <p>
    <a href='http://www.pledgie.com/campaigns/8424'><img alt='Click here to lend your support to: celery and make a donation at www.pledgie.com !' src='http://www.pledgie.com/campaigns/8424.png?skin_name=chrome' border='0' /></a>
    </p>
    <p>Donations will be used to fund infrastructure and new features.</p>
    <p>
    You can <a href='http://www.pledgie.com/campaigns/8424'
        target='_new'>donate to the project</a> using PayPal.
    For other arrangements you can send an email to
    <a href="mailto:donate@celeryproject">donate@celeryproject.org</a>.


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    <div class="column side">

      <span class="newsitem">
      <h2>Celery 2.2 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2011-02-01.</h4>
      <p>A great number of new features, including Jython, eventlet and gevent
      support.  Everything is detailed in the
      <a href="http://docs.celeryproject.org/changelog.html">Changelog</a>, which
      you should have read before upgrading.</p> <p>Users of Django must also upgrade to
      <a href="http://pypi.python.org/pypi/django-celery">django-celery 2.2</a>.</p>
      <p>This release would not have
      been possible without the help of contributors and users, so
      thank you, and congratulations!
      </span>

      <span class="newsitem">
      <h2>Celery 2.1.1 bugfix release</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-10-14.</h4>
      <p>All users are urged to upgrade.  For a list of changes see the
      <a href="http://docs.celeryproject.org/changelog.html">Changelog</a>.</p>
      <p>Users of Django must also upgrade to
      <a href="http://pypi.python.org/pypi/django-celery">django-celery 2.1.1</a>.</p>
      </span>

      <span class="newsitem">
      <h2>Celery 2.1 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-10-08.</h4>
      <p>This new version is now available at PyPI.  Be sure to read the
      <a href="http://docs.celeryproject.org/changelog.html">Changelog</a> before upgrading.</p>
      </span>

      <span class="newsitem">
      <h2>Celery 2.0 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-07-02.</h4>
      <p>We're proud to announce the release of Celery 2.0. This version replaces
      the Django ORM with SQLAlchemy as the database result store. With this, Celery no
      longer depends on Django. Django integration is now available as a separate package
      called <a href="http://pypi.python.org/pypi/django-celery">django-celery</a>.
      </p>

      <p>In addition there are a lot of new features: a curses monitor, time
      limits, complex crontab expressions, callbacks, simplified routing,
      and more. Everything is detailed in the <a
          href="http://docs.celeryproject.org/changelog.html#id1">Changelog</a>,
      so be sure to read it before upgrading.</p>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.6 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-06-30.</h4>
      <p>RabbitMQ 1.8.0 came with stricter equivalence checks that broke the
      AMQP result backend, this release resolves this. If you've already used
      the AMQP backend you need to delete the previous declarations. For
      instructions please read the full
      <a href="http://docs.celeryproject.org/changelog.html">Changelog</a>.
      Download from <a href="http://pypi.python.org/pypi/celery/1.0.6">PyPI</a>,
      or simply install the upgrade using <code>pip install -U Celery==1.0.6</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.5 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-06-01.</h4>
      <p>This release contains some important bug fixes related to shutdown and
      broker connection loss, as well as some other minor fixes. Also
      AbortableTask has been added to contrib. Please read the full <a
          href="http://docs.celeryproject.org/changelog.html">Changelog</a>
      before you upgrade. Download from <a href="http://pypi.python.org/pypi/celery/1.0.5">PyPI</a>,
      or simply install the upgrade using <code>pip install -U Celery</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.3 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-05-15.</h4>
      <p>This release contains a drastic improvement in reliability and
      performance. Please read the full <a href="http://docs.celeryproject.org/changelog.html">Changelog</a>
      before you upgrade. Download from <a href="http://pypi.python.org/pypi/celery/1.0.3">PyPI</a>,
      or simply install the upgrade using <code>pip install -U Celery</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0.1 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-03-20.</h4>
      <p>This is a bugfix release and has some important changes to the
      shutdown procedure. Also improved compatibility with Windows and Python
      2.4. Read the full <a href="http://docs.celeryproject.org/changelog.html">Changelog</a>
      for more information. Download from <a
          href="http://pypi.python.org/pypi/celery/1.0.1">PyPI</a>,
      or simply install the upgrade using <code>pip install -U Celery</code>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>Celery 1.0 released!</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-02-10</h4>
      <p>Celery 1.0 has finally been released! It is available on <a
          href="http://pypi.python.org/pypi/celery/1.0.0">PyPI</a> for
      downloading. You can also install it via <code>pip install
          Celery</code>. You can read the announcement <a href="http://celeryproject.org/celery_1.0_released.html">here</a>.
      <hr>
      </span>

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 <div id="credits">
   <ul>
     <li>
       <strong>Copyright (c) 2009-2011</strong>
       <span><a href="http://twitter.com/asksol">Ask Solem</a> and
         <a href="http://github.com/ask/celery/blob/master/AUTHORS">contributors</a>.</span>
     </li>
     <li>
       <strong>Web Design</strong>
       <span><a href="http://www.helmersworks.com/">Jan Henrik Helmers</a></span>
     </li>
   </ul>
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