I have a Web2Py webapp which is a web interface for a blastn script. Now I
need to limit the process running simultaneously, my thought is,
When the webapp starts, the way I did is, in default.py:
available_worker = multiprocessing.cpu_count() - 1
def get_workers():
global available_worker
return available_worker
def consume_worker():
global available_worker
available_worker = available_worker - 1
def free_worker():
global available_worker
available_worker = available_worker + 1
def index():
if get_workers() > 0:
consume_worker()
# run a script
free_worker()
print get_workers()
Obviously, it will not work as every time the web loads, it resets the
available_worker to `multiprocessing.cpu_count() - 1`.
I am just wondering, if there is a way I can share the availabe_worker
across the web sessions or users.
So by the time a user A loads the page, the `available_worker` is 2, he
runs the script. While user A is running the script, a user B loads the
webapp, and he gets `available_worker` is 1, and he runs the script. While
A and B are running the script, the a user C comes, he gets
`available_worker` is 0, so he has to wait until either A or B finishes the
script before he can run the script.
I am new to programming, a detailed explanation and sample code will be
much much appreciated.
Thank you.
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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