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Hi Caz,<br>
<br>
Not silly at all, that is a little confusing :)<br>
<br>
In 2.x versions of Darshan, 'multi' would indicate that a given
Darshan log contained file records that were not opened collectively
(across all ranks, denoted by rank == -1). 'single' would indicate
that a log contained file records that were opened collectively
across all ranks. I *think* the thought process for naming that way
is that files which are accessed by all ranks have a *single*
record, whereas applications which open independent files on each
process have *multiple* file records. <br>
<br>
At any rate, in newer versions of Darshan (>=3.0.0), the wording
has been changed to be more clear. We use 'shared' to denote
applications which used a single, shared file for I/O (i.e.,
single=>shared) and we use 'fpp' (file-per-process) to indicate
logs which have files that were opened independently by a certain
process (i.e., multi=>fpp).<br>
<br>
Also, note that a given log file can be viewed as both single/shared
and multi/fpp by darshan-analyzer. Any log that has a shared file
record in it will be classified as single/shared and similarly any
log with a file that was accessed by either a single rank or a
subset of ranks will be classified as multi/fpp. The tool is just
meant to give a general overview of the type of access patterns a
directory of logs used.<br>
<br>
--Shane<br>
<br>
<div class="moz-cite-prefix">On 07/08/2016 11:47 AM, Casmira, Jason
P wrote:<br>
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<p class="MsoNormal">Hello.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hopefully this isn’t too silly of a
question.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I see this code in darshan-analyzer.c:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> if (cp_file.rank == -1)<o:p></o:p></p>
<p class="MsoNormal"> *used_single = 1;<o:p></o:p></p>
<p class="MsoNormal"> else<o:p></o:p></p>
<p class="MsoNormal"> *used_multi = 1;<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But from darshan_parser.c:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> printf("\n# description of
columns:\n");<o:p></o:p></p>
<p class="MsoNormal"> printf("# <rank>: MPI
rank. -1 indicates that the file is shared\n");<o:p></o:p></p>
<p class="MsoNormal"> printf("# across all processes
and statistics are aggregated.\n");<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It’s not clear to me how to interpret
darshan_analyzer’s use of the rank field.<o:p></o:p></p>
<p class="MsoNormal">Intuitively I’m thinking it would be the
opposite (-1 == shared == multi), so I think<o:p></o:p></p>
<p class="MsoNormal">I’m missing something fundamental here, and
I hope someone can clarify for me.<o:p></o:p></p>
<p class="MsoNormal">I tried searching on “rank” and
“darshan-analyzer” but couldn’t find an answer.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.<br>
<br>
Caz.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">Jason
Casmira</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">Intel
Corporation</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif">503.712.5610</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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