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<div>John,</div>
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<div>Are you able to pin this down into more of a reproducer? Even just a more granular description.</div>
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<div>I’m curious to explore it - this is poor behavior, not desirable for sure. I’m curious in particular to see about the lock cancellation - my understanding had been the glimpse request to read lock path was entirely opportunistic (NONBLOCKING in ldlm speak)
- and would never cause a cancel (ie, my understanding doesn’t accord with Andreas’s). I was pretty sure about that.</div>
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<div>But this behavior is suggestive that I’ve got that wrong or there’s something else weird.</div>
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<div>Patrick</div>
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<div dir="ltr" id="divRplyFwdMsg"><font color="#000000" style="font-size: 11pt;" face="Calibri, sans-serif" data-ogsc=""><b>From:</b> John Bauer <bauerj@iodoctors.com><br>
<b>Sent:</b> Tuesday, March 24, 2026 6:12 PM<br>
<b>To:</b> Oleg Drokin <green@whamcloud.com><br>
<b>Cc:</b> lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org>; adilger@thelustrecollective.com <adilger@thelustrecollective.com>; Patrick Farrell <pfarrell@ddn.com><br>
<b>Subject:</b> Re: [lustre-discuss] Lustre caching behavior</font>
<div> </div>
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<p>Oleg,</p>
<p>I recreated the plots with a shared time axis. In your comments you mention the "writer node". Note that all the reading and writing was done on a single compute node.</p>
<p>Andreas,</p>
<p>Concerning your comments, this is really troubling when considering benchmarking. I first got a hint of this while benchmarking on a system that uses quotas. I suspect the quota daemon periodically walks the file system doing stat()s. One of my runs had
significantly better performance and I now think it was because my directory was hit by a stat(). The performance improvement I saw was a one-off. Could quotas cause this?
<b>Benchmarkers beware</b>, doing an<font face="Courier New, Courier, monospace">
<b>ls -l</b></font> in your benchmarking directory could significantly alter performance. I've been benchmarking I/O for decades and have never observed this behavior. More correctly, I have seen odd one-off behaviors, but never figured out what to attribute
it to.</p>
<p>John</p>
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.uJ7hSEWCHfAfUB4Y-Lz4DI7WDXK4Htg0AF7PRKNoicqDjaSEHvK6Ybi0xJvKWmkyxjsZv1yZ4T0AIH5zp4G3nOFvTo3uH8T2koeiaOII1sMEQ_LxrZzY9wGOYaenEPFwy4yTPqi3h-vZmqTiUcZM2WpbU3u9llp3rvuYArN4xTa8VWdlj0rCCtNflrWCrCGFroXEjQXUrkrmKtdlhjDaX5YqKDMT4_wKfj82YEbkNebcyzgKoKcITBaU4pGvkdftbNVqmQMdQrPp-NsCplM3I_bnc8n3eZ0jVnGJg7izNDeYUu5rIoIFd95IYbt6g0DPulsjXdwuwBJRMBOTXEoHxg&animation=true"></p>
<p>All 6 OSC<b> cached versus time</b> are in this next plot. Top frame w/o stat()s. Bottom frame with stat()s. It can be determined which OSCs are associated with the first file by its start time.</p>
<p>Notice in the top frame that the first file, even though it was not read or written to after RTC=106 seconds, it never gave up any of its cache, even though the second file was in dire need of the memory for caching. Files were not closed until all reading
and writing was completed. The bottom frame, with the stat()s is much better behaved and much faster.</p>
<p><img height="683" width="1052" alt="https://www.dropbox.com/scl/fi/8xdif7vu3penwtx1bepjw/sim_osc_cached.png?rlkey=rqq9che3yjtzds8hjkg411nec&st=0c5pknhn&dl=0" style="height: auto;" 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.uJ7hSEWCHfAfUB4Y-Lz4DI7WDXK4Htg0AF7PRKNoicqDjaSEHvK6Ybi0xJvKWmkyxjsZv1yZ4T0AIH5zp4G3nOFvTo3uH8T2koeiaOII1sMEQ_LxrZzY9wGOYaenEPFwy4yTPqi3h-vZmqTiUcZM2WpbU3u9llp3rvuYArN4xTa8VWdlj0rCCtNflrWCrCGFroXEjQXUrkrmKtdlhjDa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<div class="x_moz-cite-prefix">On 3/24/2026 5:08 PM, Oleg Drokin wrote:<br>
</div>
<blockquote type="cite">
<pre class="x_moz-quote-pre">On Tue, 2026-03-24 at 21:08 +0000, Andreas Dilger via lustre-discuss
wrote:
</pre>
<blockquote type="cite">
<pre class="x_moz-quote-pre">read locks (which would be counter productive), and whether it would
be possible to downgrade the DLM write locks to read locks while
preserving the cached data on the client(s).
</pre>
</blockquote>
<pre class="x_moz-quote-pre">I think we long wanted this functionality but never implemented it.
The other thing in those graphs (a bit annoying to see because the
scale differs from graph to graph), but the start-workload seems to run
faster at least on the writer node, but I am not sure if that's part of
the question of just a normal variancy of the environment.
</pre>
</blockquote>
</div>
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