It did the trick, thank you very much! Now I have 1 worker per installation 
and system breathes mush faster even without swap file! Multiple python 
process still remain though...

On Monday, November 26, 2018 at 4:51:06 PM UTC+2, Nguyễn Văn Tú wrote:
>
> For testing purposes, you can reduce the number of workers, which is safe 
> and greatly reduce the amount of ram usage. The number of workers is set in 
> /edx/app/edxapp/lms_gunicorn.py and /edx/app/edxapp/cms_gunicorn.py.
>
> On Mon, Nov 26, 2018 at 11:26 PM Andreas Gelever <[email protected] 
> <javascript:>> wrote:
>
>> Hi!
>> I've installed the newest release of Open edX Hawthorn.2 on my developer 
>> PC running Ubuntu 16.04 LTE for testing purposes.
>> The problem is that the whole bunch of installed services and systems 
>> consumes all my available RAM of 8GB as well as swap of 3.7 GB.
>>
>> *Can I safely turn off some of them to release some memory space?*
>>
>> Sorry, I am not an expert in Open edX architecture (I come from Java 
>> community) with no idea why it needs ruby, rabbitMQ, memcached even Java 
>> and other tools (of course I am aware it is written in Python))). But 
>> particularly I noticed about 14 heavy *python* processes under www-data 
>> user in System monitor consuming 200MB each! And 8 heavy *gunicorn* 
>> processes under the same user consuming approx. the same amount of memory 
>> each. Screenshots are attached.
>>
>> As this is *not a production installation*, and my objective is only to 
>> test some basic features like Studio and LTI interoperability,
>> I would like to disable unnecessary functions, just to release a bit of 
>> RAM on my PC for browser and my Java IDE.
>>
>> If this is possible, please provide some instructions how to disable 
>> unnecessary services safely with the possibility to revert them back as 
>> needed.
>> Any suggestions and links to a bit deeper information than is placed in 
>> on-line documentation would be greatly appreciated!
>> Thank you.
>>
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>>
>

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