<div dir="ltr"><div>Thanks for the explanation Phil!!</div><div><br></div><div>Jeff</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 9, 2021 at 5:40 PM Phil Carns <<a href="mailto:carns@mcs.anl.gov">carns@mcs.anl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">

  
  <div>
    <p>Hi Jeff,<br>
    </p>
    <p>That's not a silly question at all :)</p>
    <p>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).<br>
    </p>
    <p>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).</p>
    <p>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.<br>
    </p>
    <p>thanks,</p>
    <p>-Phil<br>
    </p>
    <div>On 8/9/21 10:38 AM, Jeffrey Layton
      wrote:<br>
    </div>
    <blockquote type="cite">
      
      <div dir="ltr">
        <div>Good morning,</div>
        <div><br>
        </div>
        <div>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?</div>
        <div><br>
        </div>
        <div>Thanks!</div>
        <div><br>
        </div>
        <div>Jeff</div>
        <div><br>
        </div>
        <div>P.S. Apologies for the silly Monday morning question.</div>
        <div><br>
        </div>
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