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pyramid pserve appears multithreaded (?)

I'm hoping to multithread pyramid 1.10.4 requests ... but it appears that pserve is already multithreaded. The Pyramid docs seems to say pserve is single threaded, but when I put

sleep(10)

in my view, and issue

  for ii in $(seq 20); do
  time wget -O tempa$ii http://localhost:6543 &> outa$ii &
  done

I find that 4 of the requests complete in 10 seconds, the next 4 in 20 seconds, the next 4 in 30 seconds, etc.

Apparently somebody (pserve?) is already running 4 threads. But nowhere do I find this documented. There is no mention of threading in either development.ini or production.ini.

How can I control the number of available threads for pserve?

If pserve is the wrong way to do threading, what is the right way?

Solution

  • pserve is just a thin CLI runner and is not a server. You likely have the server section of your ini configured to tell pserve to use waitress. Waitress is a WSGI server that utilizes a threadpool to serve requests and you’ll want to read its docs. To change the size of the thread pool you can set threads = 10 in the server section.