[dm-devel] How to properly benchmark dm-cache
Remington Brasga
Remington.Brasga at taec.toshiba.com
Fri Sep 1 16:40:41 UTC 2017
Hi Mike,
I'm using the latest release of RHEL 7.4, kernel version 3.10.0-693.el7.x86_64.
Thanks for sharing. I am looking forward to Sanjay's comments.
Thanks,
-Remi
-----Original Message-----
From: Mike Snitzer [mailto:snitzer at redhat.com]
Sent: Friday, September 01, 2017 08:59
To: Remington Brasga
Cc: dm-devel at redhat.com; Sanjay Rao; ejt at redhat.com
Subject: Re: How to properly benchmark dm-cache
On Thu, Aug 31 2017 at 5:29pm -0400,
Remington Brasga <Remington.Brasga at taec.toshiba.com> wrote:
> Hi, I'm trying to benchmark dm-cache, but I'm having trouble getting the
> benchmark to show positive results. I've tried TPC-B, TPC-C, TPC-H, SQL,
> and a handful of other, but I think because they are simulations they
> don't generate the `hot spots' required to promote blocks to the cache.
>
> I know it's easy to show results using FIO with a specific configuration,
> but I was hoping to use a real benchmark like the ones I've tried.
>
> Does anyone have a good set of benchmarks that shows positive results?
Hi Remi,
Which kernel are you testing?
I know Sanjay Rao (cc'd) has done various dm-cache testing with an OLTP workload against an Oracle DB and that he has seen very solid results with the latest dm-cache.
I'm not sure if he, or others, tried any of the TPC variants but hopefully Sanjay can respond with where/how he got dm-cache to respond well to his tests.
Mike
More information about the dm-devel
mailing list