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celery


			
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  <ul>
    <li>Background Processing
    <li>Distributed
    <li>Asynchronous/Synchronous
    <li>Concurrency
    <li>Periodic Tasks
    <li>Retries
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        <h2>Distributed Task Queue</h2>
        <p>
        Celery is a task queue/job queue based on distributed message passing.
        It is focused on real-time operation, but support scheduling as well.</p>

        <p>The execution units, called tasks, are executed concurrently on one
        or more worker servers. Tasks can execute asynchronously (in the background) or
        synchronously (wait until ready).</p>

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

        <p>Celery was originally created for use with Django, but is now
        usable from any Python project.
        It can also <a href="http://ask.github.com/celery/userguide/remote-tasks.html">operate with other languages</a> via webhooks.</p>

        <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.decorators</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://ask.github.com/celery/getting-started/broker-installation.html">RabbitMQ</a>
        or one of the <a href="http://ask.github.com/celery/tutorials/otherqueues.html">ghetto queue</a>
        solutions.
        <li>Select one of the following guides:
        <ul>
            <li><a href="http://ask.github.com/celery/getting-started/first-steps-with-python.html">First steps with Python</a></li>
            <li><a href="http://ask.github.com/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>

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      <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://celeryproject.org/docs/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://celeryproject.org/docs/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="celery_1.0_released.html">here</a>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>1.0 is in beta.</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-02-08</h4>
      <p>1.0 is scheduled to be released this week! Please help us test the latest
      <a href="http://github.com/ask/celery/tarball/v1.0.0-pre4">release
          candiate</a> to make this happen. To upgrade from an earlier
      version, please read the <a href="http://ask.github.com/celery/changelog.html">changelog</a>.
      <hr>
      </span>

      <span class="newsitem">
      <h2>New website.</h2>
      <h4>By <a href="http://twitter.com/asksol">@asksol</a> on 2010-02-08</h4>
      <p>We finally got a home page. Big thanks to <a href="http://helmersworks.com">Jan Henrik Helmers</a>
      <hr>
      </span>

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     <div class="iStretch">Copyright (c) 2009-2010, <a href="http://twitter.com/asksol">Ask Solem</a> and
         <a href="http://github.com/ask/celery/blob/master/AUTHORS">contributors</a>.<br>
 Page design by <a href="http://www.helmersworks.com/">Jan Henrik Helmers</a>
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