From: Mark Nelson <mnelson@redhat.com>
To: Somnath Roy <Somnath.Roy@sandisk.com>,
"Chen, Xiaoxi" <xiaoxi.chen@intel.com>,
Haomai Wang <haomaiwang@gmail.com>
Cc: ceph-devel <ceph-devel@vger.kernel.org>
Subject: Re: Regarding newstore performance
Date: Thu, 16 Apr 2015 13:17:18 -0500 [thread overview]
Message-ID: <552FFCAE.1040303@redhat.com> (raw)
In-Reply-To: <755F6B91B3BE364F9BCA11EA3F9E0C6F2CD7A4EF@SACMBXIP01.sdcorp.global.sandisk.com>
On 04/16/2015 01:17 AM, Somnath Roy wrote:
> Here is the data with omap separated to another SSD and after 1000GB of fio writes (same profile)..
>
> omap writes:
> -------------
>
> Total host writes in this period = 551020111 ------ ~2101 GB
>
> Total flash writes in this period = 1150679336
>
> data writes:
> -----------
>
> Total host writes in this period = 302550388 --- ~1154 GB
>
> Total flash writes in this period = 600238328
>
> So, actual data write WA is ~1.1 but omap overhead is ~2.1 and adding those getting ~3.2 WA overall.
Looks like we can get quite a bit of data out of the rocksdb log as
well. Here's a stats dump after a full benchmark run from an SSD backed
OSD with newstore, fdatasync, and xioxi's tuanbles to increase buffer sizes:
http://www.fpaste.org/212007/raw/
It appears that in this test at least, a lot of data gets moved to L3
and L4 with associated WA. Notice the crazy amount of reads as well!
Mark
next prev parent reply other threads:[~2015-04-16 18:17 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-15 6:01 Regarding newstore performance Somnath Roy
2015-04-15 12:23 ` Haomai Wang
2015-04-15 16:07 ` Somnath Roy
2015-04-16 1:47 ` Chen, Xiaoxi
2015-04-16 4:22 ` Somnath Roy
2015-04-16 6:17 ` Somnath Roy
2015-04-16 18:17 ` Mark Nelson [this message]
2015-04-17 0:38 ` Sage Weil
2015-04-17 0:47 ` Gregory Farnum
2015-04-17 0:53 ` Sage Weil
2015-04-17 0:55 ` Chen, Xiaoxi
2015-04-17 4:53 ` Haomai Wang
2015-04-17 15:28 ` Sage Weil
2015-04-17 12:10 ` Mark Nelson
2015-04-17 14:08 ` Chen, Xiaoxi
2015-04-17 14:20 ` Haomai Wang
2015-04-17 14:29 ` Chen, Xiaoxi
2015-04-17 14:34 ` Mark Nelson
2015-04-17 14:40 ` Chen, Xiaoxi
2015-04-17 15:25 ` Mark Nelson
2015-04-17 16:05 ` Sage Weil
2015-04-17 16:59 ` Mark Nelson
2015-04-17 15:46 ` Sage Weil
2015-04-18 3:34 ` Mark Nelson
-- strict thread matches above, loose matches on Subject: below --
2015-04-13 23:53 Somnath Roy
2015-04-14 0:06 ` Mark Nelson
2015-04-14 0:12 ` Somnath Roy
2015-04-14 0:21 ` Mark Nelson
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