* How to properly benchmark dm-cache
@ 2017-08-31 21:29 Remington Brasga
2017-09-01 15:58 ` Mike Snitzer
0 siblings, 1 reply; 3+ messages in thread
From: Remington Brasga @ 2017-08-31 21:29 UTC (permalink / raw)
To: dm-devel
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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?
Thanks,
-Remi
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: How to properly benchmark dm-cache
2017-08-31 21:29 How to properly benchmark dm-cache Remington Brasga
@ 2017-09-01 15:58 ` Mike Snitzer
2017-09-01 16:40 ` Remington Brasga
0 siblings, 1 reply; 3+ messages in thread
From: Mike Snitzer @ 2017-09-01 15:58 UTC (permalink / raw)
To: Remington Brasga; +Cc: dm-devel, ejt
On Thu, Aug 31 2017 at 5:29pm -0400,
Remington Brasga <Remington.Brasga@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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: How to properly benchmark dm-cache
2017-09-01 15:58 ` Mike Snitzer
@ 2017-09-01 16:40 ` Remington Brasga
0 siblings, 0 replies; 3+ messages in thread
From: Remington Brasga @ 2017-09-01 16:40 UTC (permalink / raw)
To: Mike Snitzer, Sanjay Rao; +Cc: dm-devel, ejt
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@redhat.com]
Sent: Friday, September 01, 2017 08:59
To: Remington Brasga
Cc: dm-devel@redhat.com; Sanjay Rao; ejt@redhat.com
Subject: Re: How to properly benchmark dm-cache
On Thu, Aug 31 2017 at 5:29pm -0400,
Remington Brasga <Remington.Brasga@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
^ permalink raw reply [flat|nested] 3+ messages in thread
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2017-09-01 15:58 ` Mike Snitzer
2017-09-01 16:40 ` Remington Brasga
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