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From: Dave Jones <davej@redhat.com>
To: Brandon Philips <brandon.philips@coreos.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
	linux-mm@kvack.org, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Bad rss-counter is back on 3.14-stable
Date: Wed, 4 Jun 2014 18:22:50 -0400	[thread overview]
Message-ID: <20140604222250.GA12927@redhat.com> (raw)
In-Reply-To: <CAD2oYtOJbBLrjX9bnNQ5PQnWVdr7ggf=VZWVP3b_KPOPChjd9Q@mail.gmail.com>

On Wed, Jun 04, 2014 at 12:35:45PM -0700, Brandon Philips wrote:
 > On Wed, Jun 4, 2014 at 12:12 PM, Dave Jones <davej@redhat.com> wrote:
 > > Brandon, what kind of workload is that machine doing ? I wonder if I can
 > > add something to trinity to make it provoke it.
 > 
 > A really boring database workload (fsync() ~50ms) with a sloowww block
 > device with btrfs. There are occasional CPU spikes due to expensive
 > queries.
 > 
 > How can I be more helpful in my workload description?

I feared it would be something like a database. Trying to replicate
things seen under those workloads always seems to be challenging,
in part due to the system specific setups they seem to have.

I wonder if any of the benchmarking apps we have do a realistic
representation of what modern databases do. It might be a fun project
to take something like that and extend it to do random queries.

	Dave

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WARNING: multiple messages have this Message-ID (diff)
From: Dave Jones <davej@redhat.com>
To: Brandon Philips <brandon.philips@coreos.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
	linux-mm@kvack.org, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Bad rss-counter is back on 3.14-stable
Date: Wed, 4 Jun 2014 18:22:50 -0400	[thread overview]
Message-ID: <20140604222250.GA12927@redhat.com> (raw)
In-Reply-To: <CAD2oYtOJbBLrjX9bnNQ5PQnWVdr7ggf=VZWVP3b_KPOPChjd9Q@mail.gmail.com>

On Wed, Jun 04, 2014 at 12:35:45PM -0700, Brandon Philips wrote:
 > On Wed, Jun 4, 2014 at 12:12 PM, Dave Jones <davej@redhat.com> wrote:
 > > Brandon, what kind of workload is that machine doing ? I wonder if I can
 > > add something to trinity to make it provoke it.
 > 
 > A really boring database workload (fsync() ~50ms) with a sloowww block
 > device with btrfs. There are occasional CPU spikes due to expensive
 > queries.
 > 
 > How can I be more helpful in my workload description?

I feared it would be something like a database. Trying to replicate
things seen under those workloads always seems to be challenging,
in part due to the system specific setups they seem to have.

I wonder if any of the benchmarking apps we have do a realistic
representation of what modern databases do. It might be a fun project
to take something like that and extend it to do random queries.

	Dave


  reply	other threads:[~2014-06-04 22:22 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-04 18:27 Bad rss-counter is back on 3.14-stable Greg KH
2014-06-04 18:27 ` Greg KH
2014-06-04 18:47 ` Dennis Mungai
2014-06-04 18:47   ` Dennis Mungai
2014-06-04 19:12 ` Dave Jones
2014-06-04 19:12   ` Dave Jones
2014-06-04 19:35   ` Brandon Philips
2014-06-04 19:35     ` Brandon Philips
2014-06-04 22:22     ` Dave Jones [this message]
2014-06-04 22:22       ` Dave Jones
2014-06-04 23:37 ` Andre Tomt
2014-06-04 23:37   ` Andre Tomt
2014-06-05  0:21   ` Greg KH
2014-06-05  0:21     ` Greg KH

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