[uWSGI] Linux KSM

tk tkadm30 at yandex.com
Mon Feb 4 09:39:26 UTC 2019



Le 01/02/2019 à 10:32 a.m., Krzysztof Warzecha a écrit :
> Hello,
> 
> docs:
> 
> https://uwsgi-docs.readthedocs.io/en/latest/KSM.html
> https://www.kernel.org/doc/Documentation/vm/ksm.txt
> https://www.kernel.org/doc/html/latest/admin-guide/mm/ksm.html
> 
> The way I understand it, --ksm=10 tells uwsgi to call
> madvise(MADV_MERGABLE) on worker's memory, on every 10th request.
> Linux kernel will then consider that memory for same-page
> de-duplication. It works nice if you have uwsgi emperor with many
> vassals. It should work with many separate uwsgi instances too.
> 
> 
>> would you recommend to enable it
> 
> In theory you can save a bit of memory, but I'm pretty sure you'll
> have to benchmark it. Enable it and use /sys/kernel/mm/ksm/ to trigger
> merge and measure how effective it is (with stats from
> /sys/kernel/mm/ksm/pages_sharing).
> 

Thanks a lot for sharing this! I'm looking forward to try enabling ksmd 
with uwsgi and pypy for testing purposes... :)

kind regards,

tk

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