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Hi Neeraj,</div>
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It looks like FIO might be using the 'openat()' call to open the files it is doing I/O to, which we only recently added support for. Assuming you aren't already, would it be possible for you to try the master branch of Darshan to see whether you can generate
accurate profiles using that?<br>
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Thanks,</div>
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--Shane<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Darshan-users <darshan-users-bounces@lists.mcs.anl.gov> on behalf of Neeraj Rajesh <nrajesh@hawk.iit.edu><br>
<b>Sent:</b> Tuesday, July 14, 2020 3:15 PM<br>
<b>To:</b> darshan-users@lists.mcs.anl.gov <darshan-users@lists.mcs.anl.gov><br>
<b>Subject:</b> [Darshan-users] Issues with Fio benchmark tool being profiled with Darshan</font>
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<div>Hello <br>
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<div>I am trying to profile an Fio command, where I do roughly a gigabyte of reads or writes or mixed at a fixed block size.
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<div>eg. <br>
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<div>```</div>
<div>fio --filename=./test --size=1024MB --direct=1 --rw=randrw --bs=4k --ioengine=sync --iodepth=256 --numjobs=1 --name=test-job --minimal --stats=0</div>
<div>```<br>
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<div>I have tested it with the following 'ioengines':</div>
<div>- sync</div>
<div>- psync</div>
<div>- posixaio</div>
<div>- pvsync</div>
<div></div>
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<div>I do get a darshan file, but all of the POSIX counters are 0, except for POSIX_F_META_TIME, POSIX_STATS, POSIX_FILE_ALIGNMENT and POSIX_MMAPS. I have ensured the operation is not simultaneously doing both POSIX and STDIO.</div>
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<div>As per my configuration it should not be getting 0s especially for the counters POSIX_SIZE_WRITE_1K_10K, POSIX_WRITES, POSIX_READS, POSIX_BYTES_WRITTEN, POSIX_BYTES_READ etc.</div>
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<div>Kindly advise what to do next.</div>
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<div>Thank you for your time, Stay safe <br>
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<div>Yours Sincerely <br>
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<div>Neeraj Rajesh<br>
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