Hello!

On Wed, Mar 20, 2019 at 06:41:01PM -0400, wkbrad wrote:

[...]

> The first test I ran was in FreeBSD just because I was curious. Lol. But I
> actually saw the exact same problem on it. I can send you some tests if you
> like but they look the same as the others do.

On FreeBSD you'll see that _virtual_ memory usage grows on reload,
but the actual memory is returned to the system and can be used by
other processes.

[...]

> Notice it starts up using more memory than before but it now does not double
> it's ram usage after a reload. I can deal with that but I'm still curious
> if you know why it's now using more ram. Any thoughts on that?

This is because mmap()-based individual allocations imply additional
overhead. Using mmapAnd this is are costly.

>
> But when I bring this setup to one of my live servers the effect isn't quite
> the same. Here is a test from it with the same settings in systemd.
> --------------------------------------------------------------------------------
> [root@live ~]# systemctl restart nginx; sleep 60; ps_mem |egrep 'RAM|nginx'
> Private + Shared = RAM used Program
> 21.6 MiB + 1.4 GiB = 1.5 GiB nginx (3)
> [root@live ~]# systemctl reload nginx; sleep 60; ps_mem |egrep 'RAM|nginx'
> Private + Shared = RAM used Program
> 21.9 MiB + 2.3 GiB = 2.4 GiB nginx (3)
> --------------------------------------------------------------------------------
>
> So that's definitely better but still not like the test environment. I'm
> sure part of the difference is that this server has real traffic and is
> somewhat busy. And it's using caching and probably has different buffer
> settings and such. So that may explain why there is an increase. But it's
> still very perplexing.
>
> What are your thoughts on all of that?
>
> And thank you again for all of the help!
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,283216,283448#msg-283448
>
> _______________________________________________
> nginx mailing list
> nginx@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx

--
Maxim Dounin
http://mdounin.ru/
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