From: Bharata B Rao <bharata@linux.ibm.com>
To: Michal Hocko <mhocko@suse.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
aneesh.kumar@linux.ibm.com
Subject: Re: High kmalloc-32 slab cache consumption with 10k containers
Date: Wed, 7 Apr 2021 19:13:42 +0530 [thread overview]
Message-ID: <20210407134342.GA1386511@in.ibm.com> (raw)
In-Reply-To: <YG2diKMPNSK2cMyG@dhcp22.suse.cz>
On Wed, Apr 07, 2021 at 01:54:48PM +0200, Michal Hocko wrote:
> On Mon 05-04-21 11:18:48, Bharata B Rao wrote:
> > Hi,
> >
> > When running 10000 (more-or-less-empty-)containers on a bare-metal Power9
> > server(160 CPUs, 2 NUMA nodes, 256G memory), it is seen that memory
> > consumption increases quite a lot (around 172G) when the containers are
> > running. Most of it comes from slab (149G) and within slab, the majority of
> > it comes from kmalloc-32 cache (102G)
>
> Is this 10k cgroups a testing enviroment or does anybody really use that
> in production? I would be really curious to hear how that behaves when
> those containers are not idle. E.g. global memory reclaim iterating over
> 10k memcgs will likely be very visible. I do remember playing with
> similar setups few years back and the overhead was very high.
This 10k containers is only a test scenario that we are looking at.
Regards,
Bharata.
next prev parent reply other threads:[~2021-04-07 13:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-05 5:48 High kmalloc-32 slab cache consumption with 10k containers Bharata B Rao
2021-04-05 8:22 ` kernel test robot
2021-04-05 18:08 ` Yang Shi
2021-04-05 18:38 ` Roman Gushchin
2021-04-06 10:13 ` Bharata B Rao
2021-04-06 10:05 ` Bharata B Rao
2021-04-07 1:39 ` Yang Shi
2021-04-06 22:28 ` Dave Chinner
2021-04-07 5:05 ` Bharata B Rao
2021-04-07 10:07 ` Kirill Tkhai
2021-04-07 11:47 ` Bharata B Rao
2021-04-07 12:49 ` Kirill Tkhai
2021-04-07 13:57 ` Christian Brauner
2021-04-15 5:23 ` Bharata B Rao
2021-04-15 6:54 ` Michal Hocko
2021-04-15 7:21 ` Bharata B Rao
2021-04-16 4:44 ` Bharata B Rao
2021-04-19 1:23 ` Dave Chinner
2021-04-07 11:54 ` Michal Hocko
2021-04-07 13:32 ` Christian Brauner
2021-04-07 13:43 ` Bharata B Rao [this message]
2021-04-07 13:57 ` Michal Hocko
2021-04-07 15:42 ` Shakeel Butt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210407134342.GA1386511@in.ibm.com \
--to=bharata@linux.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=aneesh.kumar@linux.ibm.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).