linux-kernel - Re: ChunkFS - measuring cross-chunk references

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Date:	Sun, 20 May 2007 04:19:10 +0530
From:	"Karuna sagar K" <karunasagark@...il.com>
To:	suparna@...ibm.com
Cc:	"Theodore Tso" <tytso@....edu>,
	"Kalpak Shah" <kalpak@...syssoft.com>, "Amit Gud" <gud@....edu>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	val_henson@...ux.intel.com
Subject: Re: ChunkFS - measuring cross-chunk references

On 4/25/07, Suparna Bhattacharya <suparna@...ibm.com> wrote:
> On Wed, Apr 25, 2007 at 05:50:55AM +0530, Karuna sagar K wrote:
>
> One more set of numbers to calculate would be an estimate of cross-references
> across chunks of block groups -- 1 (=128MB), 2 (=256MB), 4 (=512MB), 8(=1GB)
> as suggested by Kalpak.
>

Here is the tool to make such calculations.

Result of running the tool on / partition of ext3 file system (each
chunk is 4 times a block group):

./cref.sh /dev/hda1 dmp /mnt/test 4

-------------------------------------------------------

Number of files = 221763

Number of directories = 24456

Total size = 8193116 KB

Total data stored = 7179200 KB

Size of block groups = 131072 KB

Number of inodes per block group = 16288

Chunk size = 524288 KB

No. of cross references between directories and sub-directories = 869

No. of cross references between directories and file = 584

Total no. of cross references = 13806 (dir ref = 1453, file ref = 12353)

-------------------------------------------------------


> Once we have that, it would be nice if we can get data on results with
> the tool from other people, especially with larger filesystem sizes.
>


Thanks,
Karuna

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