From: Andres Freund <andres@anarazel.de>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com
Subject: Re: [PATCH 0/3] mm: support bigger cache workingsets and protect against writes
Date: Mon, 4 Apr 2016 20:52:41 +0200 [thread overview]
Message-ID: <20160404185241.GF25969@awork2.anarazel.de> (raw)
In-Reply-To: <1459790018-6630-1-git-send-email-hannes@cmpxchg.org>
Hi Johannes,
On 2016-04-04 13:13:35 -0400, Johannes Weiner wrote:
> this is a follow-up to http://www.spinics.net/lists/linux-mm/msg101739.html
> where Andres reported his database workingset being pushed out by the
> minimum size enforcement of the inactive file list - currently 50% of cache
> - as well as repeatedly written file pages that are never actually read.
Thanks for following up!
> Andres, I tried reproducing your postgres scenario, but I could never get
> the WAL to interfere even with wal_log = hot_standby mode. It's a 8G
> machine, I set shared_buffers = 2GB, ran pgbench -i -s 290, and then -c 32
> -j 32 -M prepared -t 150000. Any input on how to trigger the thrashing you
> observed would be appreciated. But it would be great if you could test these
> patches on your known-problematic setup as well.
I'm unfortunately in the process of moving to the US (as in, I'm packing
boxes), so I can't get back to you just now. I'll try ASAP (early next
week).
Regards,
Andres
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prev parent reply other threads:[~2016-04-04 18:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-04 17:13 [PATCH 0/3] mm: support bigger cache workingsets and protect against writes Johannes Weiner
2016-04-04 17:13 ` [PATCH 1/3] mm: workingset: only do workingset activations on reads Johannes Weiner
2016-04-04 17:13 ` [PATCH 2/3] mm: filemap: only do access " Johannes Weiner
2016-04-04 21:22 ` Andrew Morton
2016-04-04 21:39 ` Rik van Riel
2016-04-04 21:55 ` Andrew Morton
2016-04-05 17:50 ` Johannes Weiner
2016-04-04 22:47 ` Johannes Weiner
2016-04-04 17:13 ` [PATCH 3/3] mm: vmscan: reduce size of inactive file list Johannes Weiner
2016-04-04 18:52 ` Andres Freund [this message]
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