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Is using Django with gunicorn is considered to be a replacement for using evented/async servers like Tornado, Node.js, and similar ? Additionally, Will that be helpful in handling long-polling/cometed services?
Finally, is Gunicorn only replacing the memory consuming Apache threads (in case of Apache/mod-wsgi) with lightweight threads, or there are an additional benefits?
Gunicorn by default will spawn regular synchronous WSGI processes. You can however tell it to spawn processes that use gevent, eventlet or tornado instead. I am only familiar with gevent which can certainly be used instead of Node.js for long polling.
The memory footprint per process is about the same for mod_wsgi and gunicorn (in my limited experience), but you get more bells-and-whistles with gunicorn. If you change the default worker class to gevent (or eventlet or tornado) you also get a LOT more performance out of each process.