Re: best practices for location of start up code

On Sat, Sep 23, 2017 at 6:21 PM, Antonis Christofides
<antonis@djangodeployment.com> wrote:
> Hello Larry,
>
> The Django development server runs in more than one thread, which is probably
> why your initialization code run twice.
>
> OTOH, it run only once on production probably because you have configured uwsgi
> to run only one process (it's possible that this is the default on single-core
> machines). However, we usually want to run at least two processes.

I have 5 uwsgi processes - I was only seeing the init code run once
because I was just sending uwsgi a reload signal. If I killed it and
restarted it I was seeing the init code run 5 times.

> Running initialization code only once per wsgi server (re)start instead of once
> per process start seems a bit strange. Why do you need this?

I had not been given all the requirements. Turns out what we need to
do should not be part of the server init, so we moved it somewhere
else.

> On 2017-09-23 21:50, Larry Martell wrote:
>> On Sat, Sep 23, 2017 at 2:39 PM, Larry Martell <larry.martell@gmail.com> wrote:
>>> On Sat, Sep 23, 2017 at 1:34 PM, James Schneider
>>> <jrschneider83@gmail.com> wrote:
>>>>
>>>> On Sep 22, 2017 2:58 PM, "Larry Martell" <larry.martell@gmail.com> wrote:
>>>>
>>>> We have some code we want to run 1 time when our django app is
>>>> started. What is the best place for this? I tried putting it in my
>>>> app's config function, but from there I get:
>>>>
>>>> *** AppRegistryNotReady: Apps aren't loaded yet.
>>>>
>>>>
>>>> Once as in only when the app is initially deployed, or once every time the
>>>> web server process is started?
>>>>
>>>> Note that if you place code to run every time the web process is started,
>>>> that it will run for every process, and most web servers spawn multiple
>>>> processes.
>>> I'm looking to run it once when the web server is started (not each
>>> time another process of the web server is started)
>> I am using nginx and uwsgi. I tried experimenting with Antonis
>> Christofides suggestion of using AppConfig.ready(). That seems to get
>> called just once when I start (or restart uwsgi). I tried many
>> connections to the server from different browsers and computers, but
>> still that was only called once. Is that something I can count on?
>>
>> Note, when running the devel django server it was called twice at
>> start up, but when the 'real' server it was only called once. Anyone
>> know why I got the 2 calls here?

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