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<body><p>Patrick,</p>
<p> </p>
<p>My answer is,</p>
<p>1. server & client version is 2.8.0.</p>
<p>2. I can enable changelog and reproduce the problem again.</p>
<p> </p>
<p>Thanks,</p>
<p>Pilsung</p>
<p> </p>
<p>--------- <b>Original Message</b> ---------</p>
<p><b>Sender</b> : Patrick Farrell <paf@cray.com></p>
<p><b>Date</b> : 2016-12-20 22:25 (GMT+9)</p>
<p><b>Title</b> : Re: [lustre-discuss] open response time increase</p>
<p> </p>
<p><br>
Pilsung,<br> <br>
Two questions to help get started.<br> <br>
1. What version of Lustre client and server?<br>
2. Do you have changelogs enabled?<br><br>
- Patrick<br><br> </p>
<hr tabindex="-1" style="width: 98%; display: inline-block;"><table class="cui-div" style="border-collapse: collapse;"><colgroup><col></colgroup><tbody><tr><td id="divRplyFwdMsg" dir="ltr"><p><span style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 11pt;"><b>From:</b> lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of 고필성 <pilsung.koh@samsung.com><br> <b>Sent:</b> Tuesday, December 20, 2016 1:52:20 AM<br> <b>To:</b> lustre-discuss@lists.lustre.org<br> <b>Subject:</b> [lustre-discuss] open response time increase</span></p>
<table class="cui-div" style="border-collapse: collapse;"><colgroup><col></colgroup><tbody><tr><td></td></tr></tbody></table></td></tr></tbody></table><table class="cui-div" style="border-collapse: collapse;"><colgroup><col></colgroup><tbody><tr><td><p>Hello all,</p>
<p> </p>
<p>I have 100 directories with 1,000,000 files at each directory in Lustre file system. My benchmark program</p>
<p>selects files randomly, opens, writes, and closes them. Then response times of open increase gradually.</p>
<p>I found that ll_invalidate_negative_children() at open scans all the child dentries to look for negative dentries</p>
<p>and invalidate them. And this scanning takes more time gradually.</p>
<p>I want to know why open invalidates negative dentries at lustre client. And whether this must be done.</p>
<p>Also I want the response time of open doesn't increase.</p>
<p> </p>
<p>Thanks in advance,</p>
<p>Pilsung</p>
<p> </p>
<p> </p>
</td></tr></tbody></table><p> </p>
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