Hello Graham,
So what would be the better solution for this,
should I go for another server instead Apache or should I use Mac laptop
instead?
Could you please suggest?
Thank you so much once again for you help.
Mohammad Nasim Ali.
On Fri, Jul 26, 2019, 3:43 AM Graham Dumpleton <graham.dumple...@gmail.com>
wrote:
> On Windows, Apache relies on multithreading, because it can't use multiple
> processes. The only solution would be to bump the Apache configuration down
> to single thread, but then because it is only a single process, the result
> is impractical, as you can only handle one request at a time. I'd suggest
> using rpy2 with mod_wsgi on Windows as a result probably isn't going to
> work very well.
>
> That said, but it would be hard to setup, you could run a background
> thread to do the rpy2 processing, and have request handlers use a queue
> between threads to deliver the task to the rpy2 specific thread and then
> wait for a response.
>
> This isn't that simple though, as you need to ensure that only the code
> run by that special thread imports rpy2. Further, any data structures going
> back and forth in the queues can't be rpy2 data structures, you would need
> to translate everything to and from rpy2 data structures to native Python
> data structures, in the rpy2 thread. Lastly being a single processing
> thread, it could itself still become a bottle neck.
>
> On 25 Jul 2019, at 8:13 pm, Nasim Ali <ali.nasi...@gmail.com> wrote:
>
> Hello All,
>
> I've been struggling for a month now to fix this issue and needed your
> help.
>
> *Apache Lounge(2.4)* + *mod_wsgi(4.6.6)* + *python 3.6.5* configuration
> is working pretty nice on my *windows* machine. Thanks to '*Graham
> Dumpleton* blogs/posts' for that.
> I'm facing one strange issue which is related to *rpy2* package.
>
> Just to give you the context that till now what I have done are as follows:
>
> *1.* After setting up all the required environment I ran command ->
> *mod_wsgi-express
> module-config*
> which gives the following scripts:
>
> LoadFile "c:/worksetup/anaconda3/python36.dll"
> LoadModule wsgi_module
> "c:/worksetup/anaconda3/lib/site-packages/mod_wsgi/server/mod_wsgi.cp36-win_amd64.pyd"
> WSGIPythonHome "c:/worksetup/anaconda3"
>
> Added above scripts as it is in *httpd.conf *file without any changes as
> suggested by *Graham Dumpleton *himself.
>
>
> *2.* After that I've created a virtual host to run my wsgi application on
> '*localhost:58188/wsgi*'
>
> httpd-vhosts.conf :
>
> <VirtualHost *:58188>
> ServerName localhost
> LogLevel info
>
> #WSGIProcessGroup test_optimization_group
> #WSGIDaemonProcess test_optimization_group user=apache group=apache
> processes=1 threads=5 request-timeout=200
> # Might stop multithreading
> WSGIApplicationGroup %{GLOBAL}
> WSGIScriptAlias */wsgi*
> "C:/Users/mysuser/PycharmProjects/test_optimization*/test.wsgi*"
> DocumentRoot "C:/Users/myuser/PycharmProjects/test_optimization"
> </VirtualHost>
>
> *3.* It is working as expected. Everything is fine till now.
>
> *4.* Now the problem comes here when I add these two below imports from
> rp2 package:
>
> * import rpy2.robjects as robjects*
>
>
> * from rpy2.robjects import panda2sri*
> The moment I add these above imports in my *test.wsgi* script *Apache*
> server stops responding rather it hangs without any error.
> However the same piece of code (the two rpy2 package imports) is working
> as expected in terminal.
>
> *I'm clueless at this point to how to fix this. I needed help on this ??*
>
> *5. *However I did some googling and found this url* : *
> https://bitbucket.org/rpy2/rpy2/issues/136/robjectsr-function-hangs-with-mod_wsgi
> which is pretty close to what I have been looking for, on windows
> machine:
> In here the last three comments where *Laurent Gautier *is saying
> that 'R cannot do multithreading and using web servers on the Python side
> that use are not going to work well'
>
> To try this fix, I tried adding *WSGIProcessGroup & WSGIDaemonProcess
> *to bring down the processes to 1 and etc.
>
> WSGIProcessGroup test_optimization_group
> WSGIDaemonProcess test_optimization_group user=apache group=apache
> processes=1 threads=5 request-timeout=200
>
> But irony of the situation is *WSGIDaemonProcess *is not supported on
> windows.
> As given here in this link :
>
> https://modwsgi.readthedocs.io/en/develop/configuration-directives/WSGIDaemonProcess.html
>
> Note that the WSGIDaemonProcess directive and corresponding features
> are not available on Windows.(from the official website)
>
> *6.* I'm not sure whether fixing point 5 (above mentioned) would fix my
> issue or is there any fix is required for this.
>
> Please let me know if I have missed anything. Any help on this is most
> welcome.
> Thanks for your help in advance.
>
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