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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>

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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><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</font>

<div> </div>

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<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>

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