[Python-ideas] Python 3000 TIOBE -3%
mal at egenix.com
Fri Feb 10 23:31:59 CET 2012
Sturla Molden wrote:
> On 10.02.2012 19:36, M.-A. Lemburg wrote:
>> In cases where the GIL does cause problems, it's usually better to
>> consider changing the application design and use asynchronous processing
>> with a single threaded design or a multi-process design where each of
>> the processes only uses a low number of threads (20-50 per process).
> The "GIL problem" is much easier to analyze than most Python developers using Linux might think:
> - Windows has no fork system call. SunOS used to have a very slow fork system call. The majority of
> Java developers worked with Windows or Sun, and learned to work with threads.
> For which the current summary is:
> - The GIL sucks because Windows has no fork.
> Which some might say is the equivalent of:
> - Windows sucks.
I'm not sure why you think you need os.fork() in order to work
with multiple processes. Spawning processes works just as well
and, often enough, is all you really need to get the second variant
The first variant doesn't need threads at all, but can not always
be used since it requires all application components to play along
nicely with the async approach.
I forgot to mention a third variant: use a multi-process design
with single threaded asynchronous processing in each process.
This third variant is becoming increasingly popular, esp. if you have
to handle lots and lots of individual requests with relatively low
need for data sharing between the requests.
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