[Darshan-users] Consecutive vs. Sequential?

[Jeffrey Layton]

Thanks for the explanation Phil!!

Jeff


On Mon, Aug 9, 2021 at 5:40 PM Phil Carns <carns at mcs.anl.gov> wrote:

> Hi Jeff,
>
> That's not a silly question at all :)
>
> Darshan labels an access as sequential if it occurs at an offset > the
> last byte accessed in the file (basically anything that doesn't seek
> backwards or overlap the preceding operation).
>
> Darshan labels an access as consecutive if it occurs at an offset exactly
> the last byte accessed + 1 (i.e. sequential, but with no gaps at all
> between operations).
>
> Both metrics are from the perspective of a single process.  So it is
> conceivable that a collection of ranks could produce a workload that looks
> consecutive at the file system level, but is interleaved among ranks such
> that it only counts as sequential at the process level.
>
> thanks,
>
> -Phil
> On 8/9/21 10:38 AM, Jeffrey Layton wrote:
>
> Good morning,
>
> I have a question about the job summary output. There is a bar chart with
> bars labeled as "sequential" and "consecutive". How are these defined?
>
> Thanks!
>
> Jeff
>
> P.S. Apologies for the silly Monday morning question.
>
>
>
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